Willow River
Willow River is a gravity dam located in Cass County, Minnesota, built in 1962. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Willow River
The primary purpose of Willow River is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Mndnr-fisheries (state). It impounds the Willow River near Riverton.
The dam stands 9 feet tall and stretches 45 feet across, has a maximum storage capacity of 13,465 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1962, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/31/2017.
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Location
| State | Minnesota |
| County | Cass |
| Nearest City | Riverton |
| River/Stream | Willow River |
| Coordinates | 47.01274, -93.89132 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 9 ft |
| Dam Height | 8 ft |
| Dam Length | 45 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 13,465 acre-ft |
| Max Storage | 13,465 acre-ft |
| Normal Storage | 5,409 acre-ft |
| Drainage Area | 9 sq mi |
| Max Discharge | 1,700 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | MNDNR-Fisheries |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/31/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00041 |
| Federal ID | MN00041 |
| More Info | State Dam Safety Program |