Overview
Anita Dam was not required in the original Huntley Project plans. Subsequent development of additional lands by local interests necessitated its construction for hold-over storage of water lifted by the turbine-driven pumps during slack periods, to reduce the extensive operating time of the pumps. This offstream storage dam was completed by the Civilian Conservation Corps (CCC) in 1937. The dam is an earth structure, 42 feet high with a volume of 143,000 cubic yards, located 1 mile southeast of the Anita Railroad Station. The combination spillway-wasteway adjoining the High Line Canal on the north abutment is a concrete-lined chute 40 feet wide with a capacity of 1,500 cubic feet per second. The dam impounds a reservoir that has a capacity of 400 acre-feet.
General
| Project | Huntley |
| Dam Type | Modified homogeneous earthfill |
| Location | Offstream, 6 miles southeast of Ballantine, Montana |
| Longitude | -108.0007553100586 |
| Latitude | 45.933431151319745 |
| Watercourse | Yellowstone River (offstream) |
| Reservoir | Anita |
| Original Construction | 1933-1937 |
| National ID Number | MT00567 |
| Base Width | 252.00 ft |
Dimensions
| Crest Elevation | 3,010.00 ft |
| Structural Height | 42.00 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 30.00 ft |
| Crest Length | 1,050.00 ft |
| Crest Width | 20.00 ft |
| Top of Active Conservation Pool (Elevation) | 2,973.00 to 3003.00 ft |
| Volume of Dam Construction Materials | 143,000 cu yds |
| Spillway Crest Elevation | 3,003.00 ft |
Hydraulics & Hydrology
| Normal Water Surface Elevation | 3,003.00 ft |
| Spillway Type | Uncontrolled concrete-lined chute at north abutment |
| Spillway Capacity at Elevation | 1,500.00 cfs at 3,007.80 ft |
| Outlet Works Capacity at Elevation | 50.00 cfs at 2,980.00 ft |
| Total Water Storage at Elevation | 400.00 acre-ft at 3,003.00 ft |
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