Smith Reservoir is located in Costilla County, Colorado, south of Blanca in the San Luis Valley. The reservoir is owned by the Trinchera Irrigation Company. The rockfill dam, Smith Dam, was built in 1914 and — according to the National Inventory of Dams — stores 14,058 acre⋅ft of water. It impounds Trinchera Creek. Sangre de Cristo Creek and sev…Smith Reservoir is located in Costilla County, Colorado, south of Blanca in the San Luis Valley. The reservoir is owned by the Trinchera Irrigation Company. The rockfill dam, Smith Dam, was built in 1914 and — according to the National Inventory of Dams — stores 14,058 acre⋅ft of water. It impounds Trinchera Creek. Sangre de Cristo Creek and several smaller creeks also flow into the reservoir; prior to the reservoir's construction, Sangre de Cristo Creek had its confluence with Trinchera Creek here.
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