Prairie du Sac Dam
| Prairie du Sac Dam | |
|---|---|
Aerial view of the Prairie du Sac Dam taken during a June 2008 flood. | |
| Location | North of Prairie du Sac, Wisconsin |
| Coordinates | 43°18′36″N 89°43′31″W / 43.3101°N 89.7253°W |
| Purpose | Power |
| Construction began | January 1911 |
| Opening date | September 1914 |
| Designed by | Daniel W. Mead |
| Operator(s) | Alliant Energy |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Wisconsin River |
| Height | 50 ft (15 m) |
| Length | 3,247 ft (990 m) |
| Reservoir | |
| Creates | Lake Wisconsin |
| Total capacity | 193,200 acre⋅ft (0.2383 km3) |
| Power Station | |
| Installed capacity | 31 MW |
The Prairie du Sac Dam is a hydroelectric dam on the Wisconsin River just north of Prairie du Sac, Wisconsin. It is owned and operated by Alliant Energy. The dam forms Lake Wisconsin. It is the last dam on the Wisconsin River before its confluence with the Mississippi River about 92 miles (148 km) downstream, and it marks the upper end of the Lower Wisconsin State Riverway.