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<br />Yampa Study Area. The Yampa River and its tributaries drain the Jlorthweslern
<br />corner of Colorarb and a little of southwestem 'Wyoming (Fig 2). The YaJlpa
<br />Ri\'er is a major tributary joining the Green River at Echo Park in Dinosaur Na-
<br />tinnal Monument. The Yampa and its major tributary, the Little Snake Hj~'et.,
<br />begin as cold, mountain streams with fine trout fishing, The Yampa contains fa~rlr
<br />poor trout h3bitat helow Craig, Colorado, mainly due to warm summer temperatu~es.
<br />The Little Snake becomes too warm for trout a few miles after it enters Colorbdo
<br />from 'Wyoming. Both rivers are used for irrigation in the fertile valleys they h~ve
<br />formed. ~I
<br />The Yampa system tends to remain clear except after rainstorms and spring r 11-
<br />ofr, differing in this reslleet from the main Green and Colorado Hivers. This pa er
<br />reports fish distribution in the Yampa from Craig, Colorado, to its mouth and Ifor
<br />the l.ittle Snake for most of its Colorado passage. i
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<br />METHODS. Dolores Rh-er. Collecting was accomplished mainly with sei~lCs,
<br />Olle 15 foot, VB in mesh and one 30 foot, % in mesh. Electrofishing was attem*ed
<br />in the 100H~r section but \vas incffccti\'e due to high salt concentration, 'I
<br />Collections were made at <eVt, rill points horn the riwl' mouth to Dolores, erlo-
<br />rado, during July, 1971. Th.! river at that time carried high flo\\"s helow the nl<l~lth
<br />of the San :\IIiguel, hut carric,d lo\\" flows in the middle section. The lower sectfon
<br />was sampled again in late August-early September during low water. Fish wrre
<br />retumed in all cases except fur one collection made near Cahone, Colorado, that +as
<br />preserved for genetic studies. 1
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<br />COLORADO
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<br />I DINOSAUR NATIONAL
<br />MONUMENT
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<br />Fig. 2. Map of the Yampa River System.
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