Upper Flowage is a gravity dam located in Washburn County, Wisconsin, built in 1915. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 100 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Upper Flowage
The primary purpose of Upper Flowage is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cargill, Austen (private). It impounds the Crystal Brook.
The dam stands 12 feet tall and stretches 100 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1915, the structure is over a century 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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/23/2021.
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Location
| State | Wisconsin |
| County | Washburn |
| Nearest City | None |
| River/Stream | Crystal Brook |
| Coordinates | 45.81007, -91.76474 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 100 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 245 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Cargill, Austen |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/23/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00663 |
| Federal ID | WI00663 |
| More Info | State Dam Safety Program |