St Ansgar Milldam is a gravity dam located in Mitchell County, Iowa, built in 1919. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 202 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 St Ansgar Milldam
The primary purpose of St Ansgar Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hl Mckinley (private). It impounds the Cedar River near Mitchell.
The dam stands 9 feet tall and stretches 202 feet across, creates a reservoir covering 55 acres, has a maximum storage capacity of 600 acre-feet, and collects water from a drainage area of 780 square miles. Completed in 1919, 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.
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Location
| State | Iowa |
| County | Mitchell |
| Nearest City | Mitchell |
| River/Stream | Cedar River |
| Coordinates | 43.39080, -92.93770 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 202 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 600 acre-ft |
| Max Storage | 600 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 55 acres |
| Drainage Area | 780 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Hl Mckinley |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01361 |
| Federal ID | IA01361 |
| More Info | State Dam Safety Program |