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Table 4.1 Period of record for the four principal stream gages. Station Continuous Streamflow /Susp. Sediment Yampa River near Mayben, CO 10/1/1916 - present 1950 - 1958 1975 1977 - present Little Snake River near Lily, CO 1952 - 1953 1957 - 1958 1959 - 1964 1974 1977 - 1986 0/1/1921 - present Yampa River at Deerlodge Park, CO 4/1/1982 - present 10/1/1946 - present 1982 - 1983 Green River near Jensen, UT 1905 - 1906 1948 - 1979 1982 - present Suspended sediment concentration represents the majority of available sediment data. Particle size analyses of suspended sediment are available, in addition to limited bed material and bed load data. The Geological Survey cites all four stations record as "good", except for periods of estimated daily discharge. Periods of estimated daily discharge are "fair" in quality at Jensen, and "poor" in quality at the other three stations. Daily discharge is typically estimated for those periods where ice conditions interfere with proper gage operation. 4.2 Desctintion of Galle Locations Yampa River near Mavbell. CO The Yampa River is the only large river in the Colorado River basin in wbich flow regimes have not been substantially altered by water development projects. From its headwaters in the Park Range near Steamboat Springs, the Yampa River meanders northward and then westward to Craig, passing through low gradient agricultural valleys and the canyons of Juniper Mountain and Cross Mountain before entering Deerlodge Park (Tyus and Karp). The Yampa River sub-basin above Deerlodge Park, as measured at the Maybell gage, drains approximately 3,410 square miles. The Geological Survey describes the natural flow of the Yampa as being affected by transbasin diversions, storage reservoirs, and irrigation diversions of approximately 65,000 acres and 800 acres, upstream and downstream of the gage, respectively. Precipitation generally falls in the form of snow during November through April, prior to rising streamflow levels in late April through mid-June due to snowmelt. The snowmelt period often produces multiple peaks on the annual hydrograph between mid-May and mid..June, local thunderstorms also produce rises in streamflow during the summer months. Little Snake River near Lily. CO The Little Snake River is the largest tributary of the Yampa River, beginning in the Sierra Madre located in North central Colorado and South central Wyoming. The Little Snake River flows generally west along the Wyoming/Colorado border to a point approximately 15 miles west of Baggs, Wyoming, and 4-2 I I I I I I I I I I I I I I I I I I ,