Twp Road 73
Twp Road 73 is an earth dam located in Lyon County, Minnesota, built in 1999. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Twp Road 73
The primary purpose of Twp Road 73 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 County Of Lyon (local government). It impounds the Cottonwood River-tr near Lynd.
The dam stands 23 feet tall and stretches 200 feet across, has a maximum storage capacity of 151 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1999, the structure is 27 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 08/24/2023.
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Location
| State | Minnesota |
| County | Lyon |
| Nearest City | Lynd |
| River/Stream | Cottonwood River-tr |
| Coordinates | 44.41386, -95.83038 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 21 ft |
| Dam Length | 200 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 151 acre-ft |
| Max Storage | 151 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 67 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | County of Lyon |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/24/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01047 |
| Federal ID | MN01047 |
| More Info | State Dam Safety Program |