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3000 0 Z O U w ir W a_ F- w w LL U m V Z 3 0 J LL g Q w o_ F- t/) } J Q D Z Q w 2 2000 1000 =A = 1962-83 - - I t I I I I I I I I 1 - - B Site 46 - Site 46 Period of record 1971-83 I I I I I I I I I I I - 80 60 40 20 C - Mean _ --- Median Period of record 1973-82 og?A"' - - I I I I I I I I I i I - 3000 2000 1000 D - 1950-79 _ OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT Figure 19. Mean daily streamflow at selected sites in White subregion of Green region. A, Site 44, White River below Meeker, Colo. B, Site 45, Piceance Creek below Ryan Gulch near Rio Blanco, Colo., and site 46, Piceance Creek at White River, Colo. C, Site 47, Yellow Creek near White River, Colo. D, Site 50, White River near Watson, Utah. dissolved sulfate apparently is from dissolution of minerals in the Williams Fork Formation, which is exposed down- stream from Yellow Creek. Calcium and bicarbonate are the predominant ions during the high-flow season. Calcium, bicarbonate, and sulfate are predominant during the low-flow season. Evacuation Creek near Watson, Utah (site 49) Runoff at site 49 (table 3, pl. 1) is very small. Evacua- tion Creek drains exposures of the Uinta Formation and the Parachute Creek Member of the Green River Formation. Snowmelt runoff along Evacuation Creek at site 49 peaks at about 2 ft3/s during April and May. Other than during occasional floods, the creek is dry during most of the year, except in the vicinity of local seepage from the Green River Formation. Sodium and sulfate are the predominant ions throughout the year and account for 80 percent of the dissolved-solids load. Mean annual flow-weighted dissolved- solids concentration averaged 1,720 mg/L during 1975-81 (table 7). White River near Watson, Utah (site 50) Site 50 (table 3, pl. 1) is 1 mi downstream from the mouth of Evacuation Creek and about 8 mi downstream from the Colorado-Utah State line. During 1979-83, a streamflow- gaging station near the State line replaced the station near Watson; the two stations are considered equivalent for this report. Streamflow volume of the White River at site 50 is essentially the same as at sites 44 and 48 (table 7). There is substantial base flow, and the snowmelt-runoff peak is par- tially depleted by irrigation diversions (fig. 19D). During 1969-83, after the Meeker well was plugged, the mean annual flow-weighted dissolved-solids concentration aver- aged 382 mg/L, and the dissolved-solids load averaged 263,000 tons. During the high-flow season, calcium and bicarbonate are the predominant ions. During the low-flow White Subregion 45