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. . . Vallecito Dam Operation To model the Los Pmos River watershed below Vallecito Dam using HEC-I, the Albuquerque District considered a release of 3, 100 cfs from Vallecito Reservoir to represent the maximum outlet release from the dam with the conservation pool full, This amount was agreed upon by the Corps of Engineers, the USBR, the Colorado Water Conservation Board, the Southern Ute Indian Tribe, and La Plata County, Table 3 lists the frequency discharge peaks generated for selected stations on the Los Pinos River. Hydrologic Analysis Results Table 3 lists the frequency discharge peaks generated for selected locations along the Los Pinos River. Figures I through 4 show the five frequency hydro graphs of the Los Pinos River at Bayfield, near Beaver Creek, at Ute Creek, and at Spring Creek, TABLE 3 DISCHARGE FREQUENCY PEAKS LOS PINOS RIVER LOCATION Drainage 10.0%- 4,0%- 2.0%- \.0%- 0.2%, Area Chance Flood Chance Flood Chance Flood Chance Flood Chance Flood (square Discharge Discharge Discharge Discharge Discharge miles) (cfs) (cfs) (cts) (cfs) (cfs) Los Pinos River uear Columbus, 32 3800 4600 5400 6500 10000 Colorado Los Pmos River at Bear Creek 58 4100 5300 6500 8200 13400 Los Pmos River at Bayfield, Colorado 70 4200 5500 6800 8700 14900 Los Pinos River above Ignacio, 166 6100 8600 11400 15100 26300 Colorado Los Pinos River through Ignacio, 214 6100 8600 11300 15000 26300 Colorado Los Pinos River at La Boca, Colorado 304 7100 10700 15000 20800 38600 The HEC-I model, as developed by the Albuquerque District, includes several combination points where tributary inflow hydro graphs are added to the Los Pinos River hydro graph, At combination point four (COM-4), upstream from Ignacio, several subbasin inflow hydrographs are combined, including Beaver Creek The flood water from Beaver Creek joins the Los Pinos River 6