Grindstone-lost-muddy Watershed Dam A- 11 is an earth dam located in DeKalb County, Missouri, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 39 ft39 ft tall and 830 ft long, taller than 85% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Grindstone-lost-muddy Watershed Dam A- 11
The primary purpose of Grindstone-lost-muddy Watershed Dam A- 11 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 Grindstone Lost Muddy Watershe (local government). It impounds the Grand River near Gallatin.
The dam stands 39 feet tall and stretches 830 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 661 acre-feet, and collects water from a drainage area of 150 square miles. Completed in 1992, the structure is 34 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. The most recent inspection on record was 07/01/1993. That was over 33 years ago.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Missouri |
| County | DeKalb |
| Nearest City | Gallatin |
| River/Stream | Grand River |
| Coordinates | 39.84373, -94.28722 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 32 ft |
| Dam Length | 830 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 661 acre-ft |
| Max Storage | 661 acre-ft |
| Normal Storage | 111 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 150 sq mi |
| Max Discharge | 32 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Grindstone Lost Muddy Watershe |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/01/1993 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50599 |
| Federal ID | MO50599 |
| More Info | State Dam Safety Program |