Lengths of Major Streams in Colorado

River               Drainage       Approximate Length 
                                   (miles)
-----------------------------------------------------------------
     
Alamosa             Rio Grande        45
Animas              Colorado         110 (85 in Colorado)
Apishapa            Arkansas         100 
Arikaree            Republican       129 (120 in Colorado)
Arkansas            Arkansas       1,450 (315 in Colorado)
Big Thompson        South Platte      65
Blue                Colorado          65
Cache La Poudre     South Platte      75
Canadian            North Platte      32
Canadian            Arkansas         768 (1 in Colorado)
Cimarron            Colorado          28 
Cimarron            Arkansas         538 (45 in Colorado)
Colorado            Colorado       1,440 (225 in Colorado)
Conejos             Rio Grande       100
Crystal             Colorado          45
Cuchara             Arkansas          58 
Dolores             Colorado         230 (180 in Colorado)
Eagle               Colorado          70
East                Colorado          40
Elk                 Colorado          46
Elkhead             Colorado          37 
Encampment          North Platte      35 (15 in Colorado)
Fall (Big Thomp.)   South Platte      13
Fall (Clear Ck.)    South Platte      15
Florida             Colorado          52 
Fraser              Colorado          53
Frenchman           Republican       130 (55 in Colorado)
Fryingpan           Colorado          40
Green               Colorado         741 (39 in Colorado)
Greenhorn           Arkansas          34
Gunnison            Colorado         140
Hidden              South Platte      10
Huerfano            Arkansas          90
Illinois            North Platte      25
La Plata            Colorado          65 (40 in Colorado)
Laramie             North Platte     183 (40 in Colorado)
Little Cimarron     Colorado          25
Little Dolores      Colorado          35 (25 in Colorado)
Little Navajo       Colorado          16
Little Snake        Colorado         135 (120 in Colorado)
Little Thompson     South Platte      32
Los Pinos           Colorado          70 (65 in Colorado)
Mancos              Colorado          80 (75 in Colorado)
Michigan            North Platte      21
Navajo              Colorado          45 (27 in Colorado)
North Platte        North Platte     618 (25 in Colorado)
Piedra              Colorado          60 
Piney               Colorado          26
Purgatoire          Arkansas         157
Republican          Republican       420 (100 in Colorado)
Rio Blanco          Colorado          32 
Rio Chama           Rio Grande        95 (11 in Colorado)
Rio Chamita         Rio Grande        15 (4 in Colorado)
Rio de Los Pinos    Rio Grande        37 (18 in Colorado)
Rio Grande          Rio Grande     1,887 (180 in Colorado)
Rio San Antonio     Rio Grande        40 (25 in Colorado)
Roaring             South Platte      10
Roaring Fork        Colorado          57
St. Charles         Arkansas          45
St. Vrain           South Platte      48
Saquache            Rio Grande        72
San Juan            Colorado         366 (86 in Colorado)
San Miguel          Colorado          83 
Slate               Colorado          20
Smoky Hill          Republican       550 (94 in Colorado)
Snake               Colorado          20
South               Rio Grande        11
South Platte        South Platte     450 (360 in Colorado)
Swan                Colorado          21
Taylor              Colorado          42
Uncompahgre         Colorado          63
Vermejo             Arkansas          60 (10 in Colorado)
West Dolores        Colorado          30
White               Colorado         183 (110 in Colorado)
Wind                South Platte      15
Williams Fork       Colorado          45
Williams Fork       Colorado          40
 (Yampa)
Yampa               Colorado         175

Source:

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