List of longest rivers of the United States (by main stem)

The longest rivers of the United States include 38 that have main stems of at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted to its tributaries". The United States Geological Survey (USGS) defines a main-stem segment by listing coordinates for its two end points, called the source and the mouth. Some well-known rivers like the Atchafalaya,Willamette, and Susquehanna are not included in this list because their main stems are shorter than 500 miles.

The Mississippi drainage basin includes the Missouri and the Mississippi rivers, the two longest main-stem rivers in the United States, as well as 18 more of the rivers on this list. The Mississippi main stem is highlighted in dark blue.

Seven rivers in this list cross or form international boundaries. Three—the Milk River, the Red River of the North, and the Saint Lawrence River—begin in the United States and flow into Canada; two do the opposite (Yukon and Columbia). Also a segment of the Saint Lawrence River forms the international border between part of the province of Ontario, Canada, and the U.S. state of New York. Of these seven rivers, only the Milk River crosses the international border twice, leaving and then re-entering the United States. Two rivers, the Colorado and the Rio Grande, begin in the United States and flow into or form a border with Mexico. In addition, the drainage basins of the Mississippi and Missouri rivers extend into Canada, and the basin of the Gila River extends into Mexico.

Sources report hydrological quantities with varied precision. Biologist and author Ruth Patrick, describing a table of high-discharge U.S. rivers, wrote that data on discharge, drainage area, and length varied widely among authors whose works she consulted. "It seems," she said, "that the wisest course is to regard data tables such as the present one as showing the general ranks of rivers, and not to place too much importance on minor (10–20%) differences in figures."

Table

The primary source for watershed and discharge data in the table below is Rivers of North America. Conflicting data from other sources, if the difference is greater than 10 percent, is reported in the notes. Discharge refers to the flow at the mouth. In the "States, provinces, and map" column, the superscripts "s" and "m" indicate "source" and "mouth". Non-U.S. states appear in italics. Except in the "States, provinces, and map" column, abbreviations are as follows: "km" for "kilometer", "mi" for "mile", "s" for "second", "m" for "meter", and "ft" for "foot".

Key
† River is not entirely within the United States.
‡ Watershed is not entirely within the United States.

Longest main-stem rivers of the United States

#	Name	Length	States, provinces, and map	Source coordinates	Mouth	Mouth coordinates	Watershed area	Discharge	Photo
1	Missouri River	2,341 mi 3,768 km	Montana^s, North Dakota, South Dakota, Nebraska, Iowa, Kansas, Missouri^m	45°55′39″N 111°30′29″W / 45.92750°N 111.50806°W / 45.92750; -111.50806 (Missouri River (source))	Mississippi River	38°48′49″N 90°07′11″W / 38.81361°N 90.11972°W / 38.81361; -90.11972 (Missouri River (mouth))	529,353 mi^2 1,371,017 km^2 ‡	69,100 ft^3/s 1,956 m^3/s
2	Mississippi River	2,340mi 3,766 km	Minnesota^s, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, Louisiana^m	47°14′22″N 95°12′29″W / 47.23944°N 95.20806°W / 47.23944; -95.20806 (Mississippi River (source))	Gulf of Mexico	29°09′04″N 89°15′12″W / 29.15111°N 89.25333°W / 29.15111; -89.25333 (Mississippi River (mouth))	1,260,000 mi^2 3,270,000 km^2 ‡	650,000 ft^3/s 18,400 m^3/s
3	Yukon River	1,979 mi 3,190 km †	British Columbia^s, Yukon Territory, Alaska^m	59°35′00″N 133°47′00″W / 59.58333°N 133.78333°W / 59.58333; -133.78333 (Yukon River (source))	Bering Sea	62°35′55″N 164°48′00″W / 62.59861°N 164.80000°W / 62.59861; -164.80000 (Yukon River (mouth))	324,000 mi^2 839,200 km^2 ‡	224,000 ft^3/s 6,340 m^3/s
4	Rio Grande	1,759 mi 2,830 km †	Colorado^s, New Mexico, Texas^m, Chihuahua, Coahuila, Nuevo León, Tamaulipas^m	37°47′52″N 107°32′18″W / 37.79778°N 107.53833°W / 37.79778; -107.53833 (Rio Grande (source))	Gulf of Mexico	25°57′22″N 97°08′43″W / 25.95611°N 97.14528°W / 25.95611; -97.14528 (Rio Grande (mouth))	340,000 mi^2 870,000 km^2 ‡	1,300 ft^3/s 37 m^3/s
5	Colorado River	1,450 mi 2,330 km †	Colorado^s, Utah, Arizona, Nevada, California, Sonora^m, Baja California^m	40°28′20″N 105°49′34″W / 40.47222°N 105.82611°W / 40.47222; -105.82611 (Colorado River (source))	Gulf of California	31°48′57″N 114°48′22″W / 31.81583°N 114.80611°W / 31.81583; -114.80611 (Colorado River (mouth))	248,000 mi^2 642,000 km^2 ‡	1,400 ft^3/s 40 m^3/s
6	Arkansas River	1,443 mi 2,322 km	Colorado^s, Kansas, Oklahoma, Arkansas^m	39°15′30″N 106°20′38″W / 39.25833°N 106.34389°W / 39.25833; -106.34389 (Arkansas River (source))	Mississippi River	33°46′30″N 91°04′15″W / 33.77500°N 91.07083°W / 33.77500; -91.07083 (Arkansas River (mouth))	160,200 mi^2 414,910 km^2	35,500 ft^3/s 1,004 m^3/s
7	Columbia River	1,243 mi 2,000 km †	British Columbia^s, Washington^m, Oregon^m	50°13′00″N 115°51′00″W / 50.21667°N 115.85000°W / 50.21667; -115.85000 (Columbia River (source))	Pacific Ocean	46°14′39″N 124°03′29″W / 46.24417°N 124.05806°W / 46.24417; -124.05806 (Columbia River (mouth))	279,548 mi^2 724,024 km^2 ‡	273,000 ft^3/s 7,730 m^3/s
8	Red River	1,125 mi 1,811 km	Oklahoma^s, Texas, Arkansas, Louisiana^m	34°34′35″N 99°57′54″W / 34.57639°N 99.96500°W / 34.57639; -99.96500 (Red River (source))	Atchafalaya and Mississippi rivers	31°01′10″N 91°44′52″W / 31.01944°N 91.74778°W / 31.01944; -91.74778 (Red River (mouth))	65,590 mi^2 169,890 km^2	30,100 ft^3/s 852 m^3/s
9	Snake River	1,040 mi 1,674 km	Wyoming^s, Idaho, Oregon, Washington^m	44°07′49″N 110°13′10″W / 44.13028°N 110.21944°W / 44.13028; -110.21944 (Snake River (source))	Columbia River	46°11′10″N 119°01′43″W / 46.18611°N 119.02861°W / 46.18611; -119.02861 (Snake River (mouth))	108,000 mi^2 281,000 km^2	55,300 ft^3/s 1,565 m^3/s
10	Ohio River	979 mi 1,575 km	Pennsylvania^s, Ohio, West Virginia, Indiana, Illinois, Kentucky^m	40°26′34″N 80°01′02″W / 40.44278°N 80.01722°W / 40.44278; -80.01722 (Ohio River (source))	Mississippi River	36°59′12″N 89°07′50″W / 36.98667°N 89.13056°W / 36.98667; -89.13056 (Ohio River (mouth))	204,000 mi^2 529,000 km^2	308,400 ft^3/s 8,733 m^3/s
11	Colorado River of Texas	970 mi 1,560 km	Texas^s, m	32°40′47″N 101°43′51″W / 32.67972°N 101.73083°W / 32.67972; -101.73083 (Colorado River of Texas (source)))	Gulf of Mexico	28°35′41″N 95°58′59″W / 28.59472°N 95.98306°W / 28.59472; -95.98306 (Colorado River of Texas (mouth))	39,900 mi^2 103,341 km^2	2,600 ft^3/s 75 m^3/s
12	Tennessee River	935 mi 1,504 km	Tennessee^s, Alabama, Mississippi, Kentucky^m	35°57′33″N 83°51′01″W / 35.95917°N 83.85028°W / 35.95917; -83.85028 (Tennessee River (source))	Ohio River	37°04′02″N 88°33′53″W / 37.06722°N 88.56472°W / 37.06722; -88.56472 (Tennessee River (mouth))	40,880 mi^2 105,870 km^2	71,000 ft^3/s 2,000 m^3/s
13	Canadian River	906 mi 1,458 km	Colorado^s, New Mexico, Texas, Oklahoma^m	37°01′11″N 105°04′33″W / 37.01972°N 105.07583°W / 37.01972; -105.07583 (Canadian River (source))	Arkansas River	35°27′12″N 95°01′58″W / 35.45333°N 95.03278°W / 35.45333; -95.03278 (Canadian River (mouth))	47,130 mi^2 122,070 km^2	6,100 ft^3/s 174 m^3/s
14	Brazos River	860 mi 1,390 km	Texas^s, m	33°16′07″N 100°00′37″W / 33.26861°N 100.01028°W / 33.26861; -100.01028 (Brazos River (source))	Gulf of Mexico	28°52′33″N 95°22′42″W / 28.87583°N 95.37833°W / 28.87583; -95.37833 (Brazos River (mouth))	44,620 mi^2 115,566 km^2	8,800 ft^3/s 249 m^3/s
15	Green River	760 mi 1,230 km	Wyoming^s, Colorado, Utah^m	43°09′13″N 109°40′18″W / 43.15361°N 109.67167°W / 43.15361; -109.67167 (Green River (source))	Colorado River	38°11′21″N 109°53′07″W / 38.18917°N 109.88528°W / 38.18917; -109.88528 (Green River (mouth))	44,900 mi^2 116,200 km^2	6,100 ft^3/s 172 m^3/s
16	Pecos River	730 mi 1,175 km	New Mexico^s, Texas^m	35°58′34″N 105°33′29″W / 35.97611°N 105.55806°W / 35.97611; -105.55806 (Pecos River (source))	Rio Grande	29°41′59″N 101°22′17″W / 29.69972°N 101.37139°W / 29.69972; -101.37139 (Pecos River (mouth))	44,000 mi^2 113,960 km^2	71 ft^3/s 2 m^3/s
17	White River (Arkansas)	720 mi 1,159 km	Arkansas^s, m, Missouri	35°50′20″N 93°36′16″W / 35.83889°N 93.60444°W / 35.83889; -93.60444 (White River (source))	Mississippi River	33°57′05″N 91°04′53″W / 33.95139°N 91.08139°W / 33.95139; -91.08139 (White River (mouth))	27,872 mi^2 72,189 km^2	34,600 ft^3/s 979 m^3/s
18	James River	710 mi 1,140 km	North Dakota^s, South Dakota^m	47°28′53″N 99°51′32″W / 47.48139°N 99.85889°W / 47.48139; -99.85889 (James River (source))	Missouri River	42°52′17″N 97°17′26″W / 42.87139°N 97.29056°W / 42.87139; -97.29056 (James River (mouth))	20,942 mi^2 54,240 km^2	854 ft^3/s 24.2 m^3/s
19	Kuskokwim River	702 mi 1,130 km	Alaska^s, m	63°05′16″N 154°38′33″W / 63.08778°N 154.64250°W / 63.08778; -154.64250 (Kuskokwim River (source))	Bering Sea	60°04′59″N 162°20′02″W / 60.08306°N 162.33389°W / 60.08306; -162.33389 (Kuskokwim River (mouth))	48,000 mi^2 124,319 km^2	67,000 ft^3s 1,900 m^3/s
20	Cimarron River	698 mi 1,123 km	Oklahoma^s, m, Colorado, Kansas	36°54′24″N 102°59′12″W / 36.90667°N 102.98667°W / 36.90667; -102.98667 ("Cimarron River (source))	Arkansas River	36°10′14″N 96°16′19″W / 36.17056°N 96.27194°W / 36.17056; -96.27194 (Cimarron River (mouth))	19,510 mi^2 50,540 km^2	1,500 ft^3/s 42 m^3/s
21	Cumberland River	696 mi 1,120 km	Kentucky^s, m, Tennessee	36°50′42″N 83°19′26″W / 36.84500°N 83.32389°W / 36.84500; -83.32389 (Cumberland River (source))	Ohio River	37°08′36″N 88°24′27″W / 37.14333°N 88.40750°W / 37.14333; -88.40750 (Cumberland River (mouth))	17,930 mi^2 46,430 km^2	30,400 ft^3/s 862 m^3/s
22	Yellowstone River	678 mi 1,091 km	Wyoming^s, Montana, North Dakota^m	43°59′18″N 109°55′45″W / 43.98833°N 109.92917°W / 43.98833; -109.92917 (Yellowstone River (source))	Missouri River	47°58′42″N 103°58′56″W / 47.97833°N 103.98222°W / 47.97833; -103.98222 (Yellowstone River (mouth))	70,400 mi^2 182,336 km^2	12,800 ft^3/s 362 m^3/s
23	North Platte River	665 mi 1,070 km	Colorado^s, Wyoming, Nebraska^m	40°38′23″N 106°24′19″W / 40.63972°N 106.40528°W / 40.63972; -106.40528 (North Platte River (source))	Platte River	41°06′50″N 100°40′33″W / 41.11389°N 100.67583°W / 41.11389; -100.67583 (North Platte River (mouth))	34,885 mi^2 90,352 km^2	770 ft^3/s 21.9 m^3/s
24	Milk River	625 mi 1,005 km†	Alberta, Montana^s, m	48°51′20″N 113°01′10″W / 48.85556°N 113.01944°W / 48.85556; -113.01944 (Milk River (source))	Missouri River	48°03′26″N 106°19′07″W / 48.05722°N 106.31861°W / 48.05722; -106.31861 (Milk River (mouth))	22,332 mi^2 57,839 km^2 ‡	670 ft^3/s 18.9 m^3/s
25	Ouachita River	605 mi 974 km	Arkansas^s, Louisiana^m	31°41′56″N 94°19′57″W / 31.69889°N 94.33250°W / 31.69889; -94.33250 (Ouachita River (source))	Black River	31°37′53″N 91°48′25″W / 31.63139°N 91.80694°W / 31.63139; -91.80694 (Ouachita River (mouth))	24,886 mi^2 64,454 km^2	29,800 ft^3/s 843 m^3/s
26	St. Lawrence River	600 mi 965 km †	New York^s, Ontario^s, Quebec^m	44°05′55″N 76°23′28″W / 44.09861°N 76.39111°W / 44.09861; -76.39111 (St. Lawrence River (source))	Gulf of St. Lawrence	49°40′00″N 64°30′00″W / 49.66667°N 64.50000°W / 49.66667; -64.50000 (Saint Lawrence River (mouth))	620,000 mi^2 1,600,000 km^2 ‡	440,000 ft^3/s 12,600 m^3/s
27	Gila River	600 mi 960 km	New Mexico^s, Arizona^m	33°10′47″N 108°12′22″W / 33.17972°N 108.20611°W / 33.17972; -108.20611 (Gila River (source))	Colorado River	32°43′11″N 114°33′19″W / 32.71972°N 114.55528°W / 32.71972; -114.55528 (Gila River (mouth))	57,850 mi^2 149,832 km^2 ‡	210 ft^3/s 6 m^3/s
28	Sheyenne River	591 mi 951 km	North Dakota^s, m	47°41′46″N 100°29′52″W / 47.69611°N 100.49778°W / 47.69611; -100.49778 (Sheyenne River (source))	Red River of the North	47°01′25″N 96°49′31″W / 47.02361°N 96.82528°W / 47.02361; -96.82528 (Sheyenne River (mouth))	8,800 mi^2 23,000 km^2	288 ft^3/s 8.2 m^3/s
29	Tanana River	584 mi 940 km	Alaska^s, m	63°02′57″N 141°51′52″W / 63.04917°N 141.86444°W / 63.04917; -141.86444 (Tanana River (source))	Yukon River	65°09′38″N 151°57′37″W / 65.16056°N 151.96028°W / 65.16056; -151.96028 (Tanana River (mouth))	44,000 mi^2 114,000 km^2	41,800 ft^3/s 1,185 m^3/s
30	Smoky Hill River	576 mi 927 km	Colorado^s, Kansas^m	38°57′01″N 102°34′49″W / 38.95028°N 102.58028°W / 38.95028; -102.58028 (Smoky Hill River (source))	Kansas River	39°03′36″N 96°48′04″W / 39.06000°N 96.80111°W / 39.06000; -96.80111 (Smoky Hill (mouth))	19,260 mi^2 49,900 km^2	1,542 ft^3/s 43.7 m^3/s
31	Niobrara River	568 mi 914 km	Wyoming^s, Nebraska^m	42°49′15″N 104°38′50″W / 42.82083°N 104.64722°W / 42.82083; -104.64722 (Niobrara River (source))	Missouri River	42°45′58″N 98°02′50″W / 42.76611°N 98.04722°W / 42.76611; -98.04722 (Niobrara River (mouth))	12,600 mi^2 32,600 km^2	1,700 ft^3/s 49 m^3/s	A small river flows through a field of grass and yellow flowers.
32	Little Missouri River	560 mi 900 km	Wyoming^s, Montana, South Dakota, North Dakota^m	44°32′25″N 104°59′57″W / 44.54028°N 104.99917°W / 44.54028; -104.99917 ("Little Missouri River (source))	Missouri River	47°36′38″N 102°52′24″W / 47.61056°N 102.87333°W / 47.61056; -102.87333 (Little Missouri River (mouth))	8,310 mi^2 21,500 km^2	450 ft^3/s 13 m^3/s
33	Sabine River	553 mi 890 km	Texas^s, Louisiana^m	32°48′29″N 95°55′14″W / 32.80806°N 95.92056°W / 32.80806; -95.92056 (Sabine River (source))	Gulf of Mexico	29°59′08″N 93°47′26″W / 29.98556°N 93.79056°W / 29.98556; -93.79056 (Sabine River (mouth))	9,756 mi^2 25,268 km^2	8,400 ft^3/s 238 m^3/s
34	Red River of the North	550 mi 890 km †	North Dakota^s, Minnesota^s, Manitoba^m	46°15′52″N 96°35′55″W / 46.26444°N 96.59861°W / 46.26444; -96.59861 (Red River of the North (source))	Lake Winnipeg	50°23′47″N 96°48′39″W / 50.39639°N 96.81083°W / 50.39639; -96.81083 (Red River (mouth))	111,000 mi^2 287,500 km^2 ‡	8,300 ft^3/s 236 m^3/s
35	Des Moines River	525 mi 845 km	Minnesota^s, Missouri, Iowa^m	44°05′02″N 95°41′17″W / 44.08389°N 95.68806°W / 44.08389; -95.68806 (Des Moines (source))	Mississippi River	41°22′52″N 91°25′21″W / 41.38111°N 91.42250°W / 41.38111; -91.42250 (Des Moines River (mouth))	12,018 mi^2 31,127 km^2	6,400 ft^3/s 182 m^3/s
36	White River (Missouri River)	506 mi 815 km	Nebraska^s, South Dakota^m	42°41′10″N 103°50′14″W / 42.68611°N 103.83722°W / 42.68611; -103.83722 (White River (source))	Missouri River	43°42′50″N 99°28′01″W / 43.71389°N 99.46694°W / 43.71389; -99.46694 (White River (mouth))	10,200 mi^2 26,418 km^2	570 ft^3/s 16 m^3/s
37	Trinity River	506 mi 815 km	Texas^s, m	32°47′54″N 96°53′52″W / 32.79833°N 96.89778°W / 32.79833; -96.89778 (Trinity River (source))	Galveston Bay	29°44′35″N 94°42′12″W / 29.74306°N 94.70333°W / 29.74306; -94.70333 (Trinity River (mouth))	17,970 mi^2 46,540 km^2	7,800 ft^3/s 222 m^3/s
38	Wabash River	503 mi 810 km	Ohio^s, Indiana^m, Illinois^m	40°21′07″N 84°45′57″W / 40.35194°N 84.76583°W / 40.35194; -84.76583 (Wabash River (source))	Ohio River	37°47′53″N 88°01′38″W / 37.79806°N 88.02722°W / 37.79806; -88.02722 (Wabash River (mouth))	32,950 mi^2 85,340 km^2	1,001 ft^3/s 28 m^3/s

Map

Map of North America showing all rivers on this list.

See also

• List of rivers of the United States
• List of rivers of the United States by discharge
• List of longest rivers in the United States by state
  • List of longest streams of Idaho
  • List of longest streams of Minnesota
  • List of longest streams of Oregon
• List of rivers by length

Notes

1. Dams, diversions for agriculture, and other human alterations to rivers have greatly affected the discharge of some rivers over time. For example, the virgin discharge of the Colorado River is estimated to have been 20,000 ft³/s (566 m³/s) compared to 1,400 ft³/s (~40 m³/s) in 2005.
2. Of the total, 10,700 mi² (28,000 km²), about two percent of the basin, is in Canada.
3. Kammerer: 76,200 ft³/s (2,160 m³/s).
4. Kammerer: 2,340 mi (3,766 km).The Atlas of Canada: 2,348 mi (3,779 km).
5. Of the total, 10,700 mi² (27,800 km²), less than one percent of the basin, is in Canada.
6. Of this total, 714 mi (1,149 km) are in Canada. This amounts to about 36 percent of the main-stem length.
7. The Atlas of Canada also lists the total basin size at 324,000 mi² (839,200 km²), split between 125,000 mi² (323,800 km²), about 39 percent, in Canada and 199,000 mi² (515,400 km²), about 61 percent, in the United States.
8. Kammerer: 1,900 mi (3,100 km). University of Texas (UT): 1,799 mi (2,895 km). The river forms the U.S.–Mexico border for 1.251 mi (2,013 km) (about 70 percent of its main-stem length) from El Paso to the Gulf of Mexico.
9. Rivers of North America says that of this total only about 170,000 mi² (450,000 km²) of the basin contribute water to the river. The University of Texas (UT) says, "The river collects rain, snowmelt and spring water from an area [of] about 215,338 mi² [557,722 km²] including closed basins." It says that 87,020 mi² (225,380 km²) of the basin (about 48 percent), not counting closed basins, are in Mexico, while 93,821 mi² (242,994 km²) (about 52 percent) are in the United States. Kammerer cites a total basin size of 336,000 mi² (870,000 km²).
10. According to the Utah Division of Water Resources, 75 mi (121 km) of the river are in Mexico. This amounts to about 5 percent of the main-stem length. Of this, 17 mi (27 km) form the border between Mexico and the United States.
11. The United Nations Environment Programme cites a total basin size of 246,000 mi² (637,000 km²), split between 2,000 mi² (5,200 km²) (about 1 percent) in Mexico and 244,000 mi² (632,000 km²) (about 99 percent) in the United States.
12. Derived by subtracting the length of the East Fork Arkansas River of roughly 16 mi (26 km) from Kammerer's total of 1,459 mi (2,348 km).
13. About 498 mi (801 km) are in Canada. This amounts to about 40 percent of the main-stem length.
14. The Atlas of Canada lists the total watershed at 259,200 mi² (671,300 km²), split between 39,700 mi² (102,800 km²) (about 15 percent) in Canada and 219,500 mi² (568,500 km²) (about 85 percent) in the United States. Kammerer's figure for the total watershed is 265,000 mi² (690,000 km²).
15. This is the combined length, 1,360 mi (2,190 km), of the main stem, Prairie Dog Town Fork Red River, and Tierra Blanca Creek minus the lengths of the latter two, 160 mi (260 km) and 75 mi (121 km). Kammerer gives the length as 1,290 mi (2,080 km).
16. Kammerer: 93,200 mi².
17. Kammerer: 56,000 ft³/s (1,600 m³)
18. Also known as the Dakota River or Jim River and not to be confused with the James River of Virginia.
19. This is the average discharge for the years 1982–94, derived by adding the discharge for each of these years and dividing by 13.
20. According to The Canadian Encyclopedia, a 110-mi (170 km) stretch of the river flows through Canada. This amounts to about 18 percent of the main-stem length.
21. The Atlas of Canada: 23,600 mi² (61,200 km²) split between 8,300 mi² (21,600 km²) (about 35 percent) in Canada and 15,300 mi² (39,600 km²) (about 65 percent) in the United States.
22. According to the U.S. Army Corps of Engineers, a 115-mi (185 km) stretch of the river forms part of the U.S.–Canada border. This amounts to about 19 percent of the main-stem length.
23. Kammerer: 396,000 mi² (1,030,000 km²).The Atlas of Canada: 519,000 mi² (1,344,200 km²), of which 324,000 mi² (839,200 km²) (about 62 percent) is in Canada and 195,000 mi² (505,000 km²) (about 38 percent) is in the United States.
24. Kammerer: 348,000 ft³/s (9,900 m³/s).
25. Of this total, 232 mi² (600 km²) (about 0.4 percent) are in the Mexican state of Sonora, and the rest is in the United States.
26. Rivers of North America describes the discharge as less than 210 ft³/s (6 m³/s.
27. This is the size of the basin upstream of a stream gauge near Kindred and at river mile 67.9 (river kilometer 109.3).
28. This is the average flow measured by a stream gauge near Kindred and at river mile 67.9 (river kilometer 109.3).
29. The main-stem length is calculated by subtracting the length of the Nabesna River from Kammerer's total of 659 mi (1,061 km). The Nabesna River is roughly 75 mi (121 km) long, calculated by adding the 60 mi (97 km) from the Nabesna mouth to Camp Creek to the distance, 15 mi (24 km), from Camp Creek to Nabesna Glacier, Kammerer's most remote source for the Tanana.
30. Reflects only that part of the basin above a stream gauge at river mile 43.3 (river kilometer 69.7) near Enterprise.
31. Measured by a stream gauge at river mile 43.3 (river kilometer 69.7) near Enterprise.
32. This is only a close approximation of the entire basin. It does not include a small fraction of the basin below the river gauge, located about 25 mi (40 km) upstream of the river mouth.
33. This is the average discharge for the years 1990–2010, derived by adding the discharge for each of these years and dividing by 21.
34. According to the Minnesota Department of Natural Resources, 394 mi (634 km) are in the United States. This amounts to about 72 percent of the main-stem length.
35. Of the total basin, 53,500 mi² (138,600 km²) (about 48 percent) are in Canada and 57,500 mi² (148,900 km²) (about 52 percent) are in the United States.

References

1. Benke & Cushing 2005, p. 1137.
2. Benke & Cushing 2005, p. 236.
3. Benke & Cushing 2005, p. 615.
4. Benke & Cushing 2005, p. 50.
5. The Road Atlas. Chicago, Illinois: Rand McNally & Company. 2008. ISBN 978-0-528-93961-7.
6. "Rivers". The Atlas of Canada. Natural Resources Canada. Archived from the original on April 4, 2007. Retrieved February 11, 2011.
7. "Missouri River Basin Basic Geography and Natural Features". United States Geological Survey. Archived from the original on April 7, 2014. Retrieved February 20, 2011.
8. McCord, Marc W. "Gila River". Wind Spirit Community. Archived from the original on March 3, 2017. Retrieved February 20, 2011.
9. Patrick 1995, p. 24.
10. Benke & Cushing 2005, p. 527.
11. The mouth coordinates and source coordinates are from the Geographic Names Information System (United States Geological Survey) or the Canadian Geographical Names Data Base except for the coordinates of the mouth of the Colorado River, derived by geolocating with Google Earth.
12. From Rivers of North America (ed. Benke and Cushing) unless otherwise noted.
13. Benke & Cushing 2005, p. 432.
14. "Missouri River". Geographic Names Information System (GNIS). United States Geological Survey. October 24, 1980. Retrieved February 4, 2011.
15. Benke & Cushing 2005, p. 469.
16. Kammerer, J. C. (September 1, 2005). "Largest Rivers in the United States". United States Geological Survey. Retrieved January 22, 2011.
17. Benke & Cushing 2005, pp. 237, 331.
18. "Mississippi River". Geographic Names Information System (GNIS). United States Geological Survey. June 4, 1980. Retrieved February 4, 2011.
19. Benke & Cushing 2005, p. 272.
20. "Atlin Lake (B.C.)". Natural Resources Canada. Archived from the original on July 6, 2011. Retrieved February 4, 2011.
21. "Yukon River". Geographic Names Information System (GNIS). United States Geological Survey. March 31, 1981. Retrieved February 4, 2011.
22. Benke & Cushing 2005, p. 796.
23. Benke & Cushing 2005, p. 186.
24. Patino, Carlos; McKinney, Daene C.; Maidment, David R. "Water Management Information System for the Rio Grande/Bravo Basin". University of Texas Center for Research in Water Resources. Archived from the original on April 1, 2015. Retrieved February 19, 2011.
25. "Rio Grande". Geographic Names Information System (GNIS). United States Geological Survey. March 30, 1979. Retrieved February 4, 2011.
26. Benke & Cushing 2005, p. 220.
27. Anderson, D. Larry (May 2002). "Utah's Perspective: The Colorado River" (PDF). p. 5. Archived from the original (PDF) on April 9, 2014. Retrieved February 19, 2011.
28. Arias, E.; Albar, M.; Parra, I; Reza, M. "Regional Definition" (PDF). United Nations Environment Programme. pp. 20–21. Archived from the original (PDF) on May 31, 2017. Retrieved May 30, 2017.
29. "Colorado River". Geographic Names Information System (GNIS). United States Geological Survey. February 8, 1980. Retrieved February 4, 2011.
30. Derived via Google Earth
31. Colorado Atlas and Gazetteer (Map). DeLorme. 1998. § 47–48. ISBN 978-0-89933-265-9.
32. "Arkansas River". Geographic Names Information System (GNIS). United States Geological Survey. November 30, 1979. Retrieved February 4, 2011.
33. Benke & Cushing 2005, p. 315.
34. "Columbia Lake". Natural Resources Canada. Archived from the original on July 6, 2011. Retrieved January 31, 2011.
35. "Columbia River". Geographic Names Information System. United States Geological Survey. November 28, 1980. Retrieved August 5, 2010.
36. Benke & Cushing 2005, p. 646.
37. Kleiner, Diana J. "Handbook of Texas: Red River". Texas State Historical Association. Archived from the original on December 23, 2015. Retrieved February 18, 2011.
38. "Handbook of Texas: Prairie Dog Town Fork of the Red River". Texas State Historical Association. Archived from the original on March 14, 2016. Retrieved February 18, 2011.
39. "Handbook of Texas: Tierra Blanca Creek". Texas State Historical Association. Retrieved February 18, 2011.
40. "Red River". Geographic Names Information System (GNIS). United States Geological Survey. June 4, 1980. Retrieved February 5, 2011.
41. Benke & Cushing 2005, p. 317.
42. "Snake River". Geographic Names Information System (GNIS). United States Geological Survey. September 10, 1979. Retrieved August 6, 2010.
43. Benke & Cushing 2005, p. 643.
44. Benke & Cushing 2005, p. 379.
45. "Ohio River". Geographic Names Information System (GNIS). United States Geological Survey. October 24, 1980. Retrieved February 5, 2011.
46. Benke & Cushing 2005, p. 413.
47. Benke & Cushing 2005, p. 198.
48. "Colorado River". Geographic Names Information System (GNIS). United States Geological Survey. November 30, 1979. Retrieved February 5, 2011.
49. Benke & Cushing 2005, p. 222.
50. Benke & Cushing 2005, p. 384.
51. "Tennessee River". Geographic Names Information System (GNIS). United States Geological Survey. September 20, 1979. Retrieved February 5, 2011.
52. Benke & Cushing 2005, p. 414.
53. "Canadian River". Geographic Names Information System (GNIS). United States Geological Survey. December 18, 1979. Retrieved February 5, 2011.
54. Benke & Cushing 2005, p. 316.
55. Benke & Cushing 2005, p. 203.
56. "Brazos River". Geographic Names Information System (GNIS). United States Geological Survey. November 30, 1979. Retrieved February 5, 2011.
57. Benke & Cushing 2005, p. 223.
58. Benke & Cushing 2005, p. 497.
59. "Green River". Geographic Names Information System. United States Geological Survey (USGS). December 31, 1979. Retrieved February 5, 2011.
60. Benke & Cushing 2005, p. 528.
61. Benke & Cushing 2005, p. 213.
62. "Pecos River". Geographic Names Information System. United States Geological Survey (USGS). November 30, 1979. Retrieved February 5, 2011.
63. Benke & Cushing 2005, p. 225.
64. Benke & Cushing 2005, p. 246.
65. "White River". Geographic Names Information System. United States Geological Survey (USGS). April 30, 1980. Retrieved February 5, 2011.
66. Benke & Cushing 2005, p. 273.
67. "River Facts". American Rivers. Archived from the original on March 10, 2012. Retrieved February 22, 2011.
68. "James River". Geographic Names Information System. United States Geological Survey (USGS). February 13, 1980. Retrieved February 22, 2011.
69. "USGS 06478513 James River near Yankton, SD". United States Geological Survey. November 2010. Retrieved February 23, 2011.
70. Benke & Cushing 2005, p. 741.
71. "Kuskokwim River". Geographic Names Information System. United States Geological Survey (USGS). January 1, 2000. Retrieved February 5, 2011.
72. Benke & Cushing 2005, p. 764.
73. "Cimarron River". Oklahoma Historical Society. Archived from the original on December 27, 2014. Retrieved February 5, 2011.
74. "Cimarron River". Geographic Names Information System. United States Geological Survey (USGS). December 18, 1979. Retrieved February 5, 2011.
75. Benke & Cushing 2005, p. 319.
76. Benke & Cushing 2005, p. 390.
77. "Cumberland River". Geographic Names Information System. United States Geological Survey (USGS). September 20, 1979. Retrieved February 5, 2011.
78. Benke & Cushing 2005, p. 415.
79. Benke & Cushing 2005, p. 440.
80. "Yellowstone River". Geographic Names Information System. United States Geological Survey (USGS). February 13, 1980. Retrieved January 20, 2011.
81. Benke & Cushing 2005, p. 470.
82. Benke & Cushing 2005, p. 451.
83. "North Platte River". Geographic Names Information System. United States Geological Survey (USGS). October 13, 1978. Retrieved February 6, 2011.
84. Marsh, James H. (March 4, 2015). "Milk River". Historica Canada. Retrieved May 19, 2017.
85. "Milk River". Geographic Names Information System. United States Geological Survey (USGS). April 4, 1980. Retrieved February 5, 2011.
86. Benke & Cushing 2005, p. 475.
87. Benke and Cushing, p. 265
88. "Ouachita River". Geographic Names Information System. United States Geological Survey (USGS). January 1, 2000. Retrieved February 6, 2011.
89. Benke & Cushing 2005, p. 279.
90. Benke & Cushing 2005, p. 987.
91. "St. Lawrence River (International Section)". U.S. Army Corps of Engineers, Detroit District. Retrieved February 19, 2011.
92. "St. Lawrence River". Geographic Names Information System. United States Geological Survey (USGS). January 1, 2000. Retrieved February 3, 2011.
93. "Saint Lawrence River". Natural Resources Canada. Archived from the original on July 6, 2011. Retrieved February 3, 2011.
94. Benke & Cushing 2005, p. 983.
95. Benke & Cushing 2005, p. 511.
96. "Gila River". Geographic Names Information System. United States Geological Survey (USGS). February 8, 1980. Retrieved February 6, 2011.
97. Benke & Cushing 2005, p. 531.
98. "National Hydrography Dataset". United States Geological Survey. Retrieved June 9, 2011.
99. "Sheyenne River". Geographic Names Information System. United States Geological Survey (USGS). February 13, 1980. Retrieved June 9, 2011.
100. "Water-Data Report 2010: 05059000 Sheyenne River near Kindred, ND" (PDF). United States Geological Survey. Retrieved June 9, 2011.
101. Irwin, Thomas (October 3, 2005). "Recordable Disclaimer of Interest Application for the Nabesna River" (PDF). U.S. Bureau of Land Management. Archived from the original (PDF) on October 19, 2012. Retrieved February 19, 2011.
102. Alaska Atlas and Gazetteer (Map) (7th ed.). DeLorme. 2010. p. 98. ISBN 0-89933-289-7.
103. "Tanana River". Geographic Names Information System. United States Geological Survey (USGS). January 1, 2000. Retrieved February 2, 2011.
104. Benke & Cushing 2005, p. 797.
105. "Smoky Hill River". Geographic Names Information System. United States Geological Survey (USGS). October 13, 1978. Retrieved June 14, 2011.
106. "Water-Data Report 2010: 06877600 Smoky Hill River at Enterprise, KS" (PDF). United States Geological Survey. Retrieved June 14, 2011.
107. "Niobrara River". Geographic Names Information System. United States Geological Survey (USGS). March 9, 1979. Retrieved July 5, 2011.
108. Benke & Cushing 2005, p. 478.
109. Personius, Robert Giles; Eddy, Samuel (February 18, 1955). "Fishes of the Little Missouri River". Copeia. 1955 (1). American Society of Ichthyologists and Herpetologists: 41. doi:10.2307/1439450. JSTOR 1439450.
110. "Little Missouri River". Geographic Names Information System. United States Geological Survey (USGS). February 13, 1980. Retrieved February 23, 2011.
111. "USGS 06337000 Little Missouri River near Watford City, ND". November 2010. Retrieved February 23, 2011.
112. Benke & Cushing 2005, p. 208.
113. "Sabine River". Geographic Names Information System. United States Geological Survey (USGS). June 4, 1980. Retrieved February 7, 2011.
114. Benke & Cushing 2005, p. 224.
115. "Red River of the North". Minnesota Department of Natural Resources. 2011. Retrieved January 22, 2011.
116. "Red River of the North: A Water Trail Guide" (PDF). Minnesota Department of Natural Resources. 2010. Retrieved February 19, 2011.
117. "Red River of the North". Geographic Names Information System. United States Geological Survey (USGS). January 1, 2000. Retrieved January 17, 2011.
118. "Red River". Natural Resources Canada. Archived from the original on July 6, 2011. Retrieved January 17, 2011.
119. Benke & Cushing 2005, p. 896.
120. "National Recreation Trails: Des Moines River Water Trail - Polk County, Iowa". American Trails. Retrieved February 5, 2011.
121. "Des Moines River". Geographic Names Information System. United States Geological Survey (USGS). April 30, 1979. Retrieved February 7, 2011.
122. Benke & Cushing 2005, p. 372.
123. Benke & Cushing 2005, p. 445.
124. "White River". Geographic Names Information System. United States Geological Survey (USGS). February 13, 1980. Retrieved February 7, 2011.
125. Benke & Cushing 2005, p. 471.
126. Benke & Cushing 2005, p. 215.
127. "Trinity River". Geographic Names Information System. United States Geological Survey (USGS). November 30, 1979. Retrieved February 7, 2011.
128. Benke & Cushing 2005, p. 227.
129. "Wabash River". Geographic Names Information System. United States Geological Survey (USGS). February 14, 1979. Retrieved July 5, 2011.
130. Benke & Cushing 2005, p. 396.

Works cited

• Benke, Arthur C.; Cushing, Colbert E. (2005). Rivers of North America. Burlington, Massachusetts: Elsevier Academic Press. ISBN 978-0-12-088253-3.
• Patrick, Ruth (1995). Rivers of the United States: Volume II: Chemical and Physical Characteristics. New York: John Wiley & Sons. p. 24. ISBN 978-0-471-10752-1.