Blackhawk Lake
Blackhawk Lake is an earth dam located in Iowa County, Wisconsin, built in 1969. It carries a Low hazard potential classification and has a fair condition assessment.
About Blackhawk Lake
The primary purpose of Blackhawk Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Iowa County (local government). It impounds the Otter Creek & Cave Hollow Br.
The dam stands 50 feet tall and stretches 1,130 feet across, creates a reservoir covering 220 acres, has a maximum storage capacity of 7,900 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1969, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 06/02/2015. That was over 10 years ago.
At 50 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Wisconsin |
| County | Iowa |
| Nearest City | None |
| River/Stream | Otter Creek & Cave Hollow Br |
| Coordinates | 43.02637, -90.27960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Dam Length | 1,130 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 7,900 acre-ft |
| Max Storage | 7,900 acre-ft |
| Normal Storage | 3,810 acre-ft |
| Surface Area | 220 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 460 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/02/2015 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00014 |
| Federal ID | WI00014 |
| More Info | State Dam Safety Program |