Union
| Dam Name | Union |
| River | Trib. St. Vrain Creek |
| Administration City | Colorado |
| Country | United States |
| Year | 1933 |
| Dam Height | 10 |
| Dam Length | 427 |
| Area(Sqkm) | 2.7 |
| Area(Polygonal) | 2.7 |
| Capital Expenditure | 22.6 |
| Depth(M) | 8.4 |
| Avg Displacement Of Water | 1 |
| Catchment Area In Sqkm | 36 |
| Main Usage | Irrigation |
| Status | 2: Good |
| Longitude | -105.04625 |
| Latitude | 40.174583 |
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