| Region | Facilities in Great Plains | Great Plains Home Page |
| State | Montana |
| County | Lewis and Clark |
| Project | Sun River |
| Dam Type | Modified homogeneous earthfill |
| Reservoir | Willow Creek |
| Watercourse | Willow Creek |
| Location | On Willow Creek, tributary to the Sun River, in Lewis and Clark County about 5 miles northwest of Augusta, Montana. Four small earth dikes close low areas north of the dam. |
| Original Construction | 1907-1911 |
| Modified Construction | Modifications made in 1917; 1941; 1996-1998; and 1999-2000. Modified in 1999-2000 to include a filtered berm and buttress. |
| National ID Number | MT00577 |
