Boller Pool is an earth dam located in Winona County, Minnesota, built in 1970. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 537 ft long, taller than 68% of U.S. dams with a recorded height. 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 Boller Pool
The primary purpose of Boller Pool 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 Evanson & Evanson Partnership (private). It impounds the Rollingstone Creek-tr near Minnesota City.
The dam stands 30 feet tall and stretches 537 feet across, has a maximum storage capacity of 125 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1970, 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. The most recent inspection on record was 05/23/2018.
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Location
| State | Minnesota |
| County | Winona |
| Nearest City | Minnesota City |
| River/Stream | Rollingstone Creek-tr |
| Coordinates | 44.06040, -91.80917 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 27 ft |
| Dam Length | 537 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 28 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 250 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Evanson & Evanson Partnership |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/23/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00569 |
| Federal ID | MN00569 |
| More Info | State Dam Safety Program |