Speltz Detention No. 2
Speltz Detention No. 2 is an earth dam located in Winona County, Minnesota, built in 1961. It carries a Low hazard potential classification and has a fair condition assessment.
About Speltz Detention No. 2
The primary purpose of Speltz Detention No. 2 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 Speltz, Herb (private). It impounds the Speltz Creek near Rollingstone.
The dam stands 31 feet tall and stretches 442 feet across, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1961, 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 06/27/2017.
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Location
| State | Minnesota |
| County | Winona |
| Nearest City | Rollingstone |
| River/Stream | Speltz Creek |
| Coordinates | 44.11920, -91.86870 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 28 ft |
| Dam Length | 442 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 16 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 761 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Speltz, Herb |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/27/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00418 |
| Federal ID | MN00418 |
| More Info | State Dam Safety Program |