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September when measurements in the Yampa River ceased. Daily water temperatures peaked at 21 Oc in the Little Snake River on July 10 and at 23 Oc in the Yampa River on September 22; although highest hourly temperature in the Little Snake River was 26 Oc on July 28 and in the Yampa River was 25 Oc on September 3. Generally the Little Snake River warmed earlier, in June and July, and the Yampa River warmed later, in August and September (Figure 3). Water temperature differences between the two rivers were best revealed in hourly measurements. Although both rivers experienced a similar diel cycle that ranged from daily low temperature just before sunrise to a daily high temperature by mid-afternoon, the Little Snake River experienced a greater range of diel temperatures than the Yampa River. In June the average range of daily fluctuation was 2.4 Oc (s = 0.5684) in the Little Snake River and 1.8 Oc (s = 0.5630) in th-e Yampa River. In July mean daily fluctuation ranged 5.4 Oc (s = 2.0328) in the Little Snake River and 2.7 Oc (s=1.5719) in the Yampa River. The difference between the two rivers was most noticeable in August when the range of daily fluctuation averaged 9.1 Oc (s = 3.4 760) in the Little Snake River and 3.2 Oc (s = 1 .6242) in the Yampa River (Figures 4 and 5). Maximum single day fluctuation was 15.5 Oc on August 19 in the Little Snake River and 11.5 Oc on August 1 in the Yampa River. The two rivers also had differences in maximum and minimum temperatures on any given day. Maximum temperatures in the Little Snake River exceeded maximum temperatures in the Yampa River on a daily basis from mid-May through mid-August (Figures 4 and 5). During June and the first half of July, minimum temperatures in the Little Snake River were usually warmer than minimum Yampa River temperatures and on several days, minimum Little Snake River temperatures even exceeded maximum Yampa River temperatures. After July 19, minimum 10