Grethe is an earth dam located in Walworth County, Wisconsin, built in 1969. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 14 ft14 ft tall and 238 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Grethe
The primary purpose of Grethe is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Series F of Lg5, LLC (private). It impounds the Bloomfield Creek.
The dam stands 14 feet tall and stretches 238 feet across, creates a reservoir covering 50 acres, has a maximum storage capacity of 53 acre-feet, and collects water from a drainage area of 3 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 10/29/2020.
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Location
| State | Wisconsin |
| County | Walworth |
| Nearest City | None |
| River/Stream | Bloomfield Creek |
| Coordinates | 42.57284, -88.38858 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 238 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 196 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Series F of Lg5, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/29/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00451 |
| Federal ID | WI00451 |
| More Info | State Dam Safety Program |