Grindstone-lost-muddy Watershed Dam B-4 is an earth dam located in DeKalb County, Missouri, built in 1979. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 640 ft long, taller than 62% 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 B-4
The primary purpose of Grindstone-lost-muddy Watershed Dam B-4 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 Gnsn-lst-mdy Wsd Sbdisri (local government). It impounds the Tr-west Fork Lost Creek near Pattonsburg.
The dam stands 28 feet tall and stretches 640 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 428 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1979, the structure is 47 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.
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Location
| State | Missouri |
| County | DeKalb |
| Nearest City | Pattonsburg |
| River/Stream | Tr-west Fork Lost Creek |
| Coordinates | 39.86190, -94.40307 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 640 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 428 acre-ft |
| Max Storage | 428 acre-ft |
| Normal Storage | 67 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 12 sq mi |
| Max Discharge | 545 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Gnsn-lst-mdy Wsd Sbdisri |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO12115 |
| Federal ID | MO12115 |
| More Info | State Dam Safety Program |