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-....... 22 Seasonal fluctuation in stream-flow The general pattern of seasonal t'luctuation in strea.rn.f1ow was e1JaUar tor all three river s (Figure 8); however, the total volume ot diaoharge tor each river was variable. The pattern of seasonal fluctuation was oharaoterized by a low now in uinter from Deoember to February, a high in Hay and J\me, a rapid decline during the rest ot the sunuuar, and slighUy increasing nOil during the fall. The nwdmum monthly discharge OIl the Green River at Greandale. utah. (below Flaming Gorge) was reached one IOOnth later than the other stations. The extreme variation between maximum and min11111Dl flows during the water year 1961 through 1962 is shown in Table 3. The 1itUe Snake River had no now for many days in August and September. In comparison with the mean maximunl IOOnthly run-off for the thirteen year period 1947 through 1959 at Jensen, Utah, the Green River during 1961 and 1962 was one month late in reaching its maximum dis- charge (figure 9). The maxill1Wll IllOnthly run-off 'Was also solnEl\-lhat higher than the mean for the thirteen year period. A simUar comparison tor the Yampa Hiver (Figure 10) shows the maximum monthly run-otf for the two periods to be comparable in time. A comparison of total volumes oan not be made since data for the 1906-1946 period were gather- ed below the mouth of the Little Snake lliver. Yearly variation in stre&4-flow The variation in total annual discharge of the Green and YaDlpa rivers lor the period 1906 through 1962 can be seen in figure 11. Total annual discharge for the Green River at Jensen. Utah, was higher during the watel" year 1961 through 1962 than the average tor the previous .56 years.