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Topographic mapping, digitized cross sections, and survey data for stream TABLE 1 crossings were provided by Reids Aerial Mapping. Additional data for bridge BENCHMARK/MONUMENT DESCRIPTIONS crossings was supplied by Boulder County and the COE. The mapping was prepared Monument No. Description Elevation according to specifications of the Urban Drainage and Flood Control District. 1 South Side of State Park Admission Gate Shack 5602.64 ' Ground control surveys for the topographic mapping were performed by Reids Aerial 2 1/2 Mile East of State Park, South Side 5617.75 Mapping and Miller-Ernstsen and Associates. Topographic mapping was prepared Road, Cap in Rock 50' East of with two-foot contour intervals at a scale of 1" = 100' (Reference 1 ). For Western Slope Gas Shed inclusion in this report , the final mapping was reduced by 50-percent. 3 On Southeasterly Corner Bridge Abutment/Headwall 5608.59 Descriptions of the monument and benchmark locations and elevations used to 300+ West of W. Prado Dr. on South Side Road ' develop the topography were obtained from Boulder County and are shown in Table 4 Senda Rocosa @ Eldorado Springs Intersection 5530.39 1. South Side of Eldorado Springs Road Along Fence 5 SW Abutment/Headwall Corner of State Highway 5452.02 The hydrologic and preliminary hydraulic analyses were completed by the U.S. Army Bridge E-15-A. West Side of #93 S.H. 93 Corps of Engineers, Omaha District. Final hydraulic analyses and floodplain 6 Behind Guardrail North Side of Trailer Park 5484.52 delineations were completed by Greenhorne and O'Mara , Inc. Road on West Side of S.H. 93 7 South Side of South Boulder Road @ S. Boulder 5338.36 - BASIN DESCRIPTION - Creek in S.W. Wingwall of Bridge ' 8 On Denver/Boulder Turnpike @ S. Boulder Creek 5369.92 General on SE Wingwall of Bridge 9 On South Boulder Road West of Cherryvale North 5351.53 South Boulder Creek, which drains an area of 132 square miles, is a right bank Side of Road. @ West End of (Fence Taper) tributary of Boulder Creek (Figure 1). From its headwaters at the Continental 10 On South Boulder Road on Northeasterly Corner 5339.05 Divide, South Boulder Creek flows in an easterly direction through relatively Abutment/Headwall N. Side of Road 500+ East steep, narrow mountain canyons for nearly 22 miles whereupon it emerges onto the of Manhatten Drive high plains at Eldorado Springs, Colorado. From Eldorado Springs, the creek 11 On East Side of Cherryvale (along fence line) 5283.24 ' flows northeasterly through a moderately wide valley over a distance of about 9.7 0.2 Mile South of Baseline Road miles to its confluence with Boulder Creek. 12 On North Side Baseline Road @ Meadow Glen Dr. 5282.97 ' in Tip of Concrete Median Strip Gross Reservoir is a water storage facility located on South Boulder Creek 13 S.E. Corner Baseline, Dimmit Dr. Cherryvale 5272.92 ' Intersection in Front of Fence approximately 3.5 miles upstream of Eldorado Springs. The reservoir was con- structed in 1955 and has a storage capacity of 43,000 acre-feet. The reservoir 14 East Side of Cherryvale 0.1 Mile South of 5255.75 is operated by the Denver Water Department and provides conservation storage for McSorley Lane Between Pole and Fence Lmunicipal use. A U.S. Geological Survey stream gaging station is situated 15 NE Corner Area of NE Wingwall Bridge Crossing 5256.49 approximately 6.7 miles downstream of the reservoir. The drainage area at the 55th - 300' + North Pennsylvania ' gaging station is about 109 square miles. 16 East Side of 55th North of Arapahoe and Just 5220.02 North of C&S Railroad Crossing On Dry Creek No. 2 Ditch r� 2