| Smith Reservoir | |
| Location: | Costilla County, Colorado |
| Coordinates: | 37.3928°N -105.5306°W[1] |
| Type: | reservoir |
| Inflow: | Trinchera Creek Sangre de Cristo Creek Ute Creek and several other smaller creeks |
| Outflow: | Trinchera Creek |
| Agency: | Trinchera Irrigation Company[2] |
| Designation: | Smith Reservoir State Wildlife Area |
| Date-Built: | [3] |
| Volume: | 14058acre.ft |
| Elevation: | 7716abbr=onNaNabbr=on |
| Frozen: | Freezes in winter |
| Pushpin Map: | Colorado |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location in Colorado |
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,[4] was built in 1914 and — according to the National Inventory of Dams — stores 14058acre.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.
The lake and the land immediately surrounding it are also designated as the Smith Reservoir State Wildlife Area. It offers trout fishing, waterfowl hunting, and camping.[5]