Glen Hills 8
Glen Hills 8 is an earth dam located in St. Croix County, Wisconsin, built in 1974. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Glen Hills 8
The primary purpose of Glen Hills 8 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by St. Croix County (local government). It impounds the Tributary To Sandy Creek.
The dam stands 30 feet tall and stretches 398 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 238 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1974, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/18/2021.
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Location
| State | Wisconsin |
| County | St. Croix |
| Nearest City | None |
| River/Stream | Tributary To Sandy Creek |
| Coordinates | 45.11212, -92.19062 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 398 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 238 acre-ft |
| Max Storage | 238 acre-ft |
| Normal Storage | 43 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 65 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | St. Croix County |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/18/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00398 |
| Federal ID | WI00398 |
| More Info | State Dam Safety Program |