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40 36 32 28 w H J w 24 a C H z W Q 20 a w J 16 C 12 8 4 0 24 28 30 34 36 37 40 43 46 52 53 54 57 SITE NUMBER (TABLE 3, PL. 1) Figure 14. Mean chemical composition of dissolved solids at selected sites in Green region. Cations on left, anions on right. 21-year period of record, this trend represents a 15-percent decrease in the median annual dissolved-solids load.. However, dissolved-solids concentration and flow-adjusted concentration did not change significantly. New Fork River near Big Piney, Wyo. (site 23) Site 23 (table 3, pl. 1) has a larger drainage area and greater annual streamflow than site 22 (fig. 15B); however, mean annual runoff at site 23 (8.7 in.) is less than at site 22. Even though site 23 is downstream from a large agri- cultural area, the mean annual flow-weighted concentration of dissolved solids (80 mg/L) is about half of that at site 22 (table 7). The predominant ions are calcium and bicarbonate, and chemical composition. is relatively constant throughout the year. No statistically significant trends were detected dur- ing 1966-83. Green River near La Barge, Wyo. (site 24) The predominant ions at site 24 (table 3, pl. 1) are calcium and bicarbonate throughout the year, although the proportion of dissolved sulfate increases during the low-flow season (fig. 14). Concentrations of dissolved sodium and chloride are very low. No statistically significant trends were detected during 1964-81. Green River below Fontenelle Reservoir, Wyo. (site 25) Site 25 (table 3, pl. 1) is located 1 mi downstream from Fontenelle Dam. Streamflow was regulated by releases from the. reservoir from 1964 to 1983, except from September 1965 through November 1967, when the reservoir was drained to repair a leak. Reservoir regulation decreased streamflow from May through July and increased streamflow Upper Green Subregion 35