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. . . -, ',-~ r~ ~"" ";Jl..lSt Mr. Porzak December 22, 2003 Page 2 The Boating Park flow requirements will apply to 'the "D" Hole andChaflie'sHole control structures, both of which are located on the Yampa River just downstream of the confluence with Soda Creek. Consequently, the streamflow availability calculations account for the Soda Creek contributions to Yampa River flows. As shown on Figure 1, the USGS gage Yampa River at Steamboat Springs (Yampa River Gage) is located just upstream of Soda Creek and the control structures. The period of record for the Yampa River Gage is from 1910 through 2002. Theavailabte flow at the Boating Park control structures is equal to the Yampa River Gage flow plus the Soda Creekinflow. - - Streamflow records of Soda Creek are not available. Our initial investigation indicates that the basin characteristics for Fish Creek are similar to Soda Creek. The USGS gage Fish Creek at Upper Station near Steamboat Splings (Fish Creek Gage) is located on Fish Creek near its confluence with the Yampa River, as shown on Figure 1. The period of record for the Fish Creek Gage is 1967 through .1972 and 1983 through 2002. We have estimated the Soda Creek drainage area to be approximately 26.20 square miles, which is fairly close to the reported Fish Creek drainage area (above the gage) of 24.80 square miles. For the streamflow availability analysis, we have assumed the streamflow reported at the Fish Creek gage to be representative of the Soda Creek flow into, the Yampa River. Based on our initial evaluation of both drainage basins, we conclude that the approximation of Soda Creek inflow with the Fish Creek gage is sufficiently accurate to verify streamflow availability for the Boating Park. Any minor adjustments resulting from a more detailed hydrological analysis would not significantly impact the overall results and conclusions of the streamflow availability analysis. The period of record of 1983 through 2002 was selected as the study period for the analysis. Gaged flow in the Yampa River during this period for April 15 through October 31 averaged 277,000 acre~feet per year, which is similar to the long-term gaged flow of 286,000 acre-feet since 1910. I conclude that 1983 through 2002