St. Anthony Falls Lower Lock And Dam
St. Anthony Falls Lower Lock And Dam is a concrete dam located in Hennepin County, Minnesota, built in 1956. It carries a Significant hazard potential classification.
About St. Anthony Falls Lower Lock And Dam
The primary purpose of St. Anthony Falls Lower Lock And Dam is navigation. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway. The dam is owned by Usace - St. Paul District (federal). It impounds the Mississippi near Minneapolis.
The dam stands 58 feet tall and stretches 213 feet across, creates a reservoir covering 50 acres, has a maximum storage capacity of 420 acre-feet, and collects water from a drainage area of 19,680 square miles. Completed in 1956, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/07/2020.
At 58 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Minnesota |
| County | Hennepin |
| Nearest City | Minneapolis |
| River/Stream | Mississippi |
| Coordinates | 44.97901, -93.24762 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 58 ft |
| Dam Height | 41 ft |
| Dam Length | 213 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 420 acre-ft |
| Max Storage | 420 acre-ft |
| Normal Storage | 375 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 19,680 sq mi |
| Max Discharge | 91,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - St. Paul District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 10/07/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MN00591 |
| Federal ID | MN00591 |
| More Info | State Dam Safety Program |