Grindstone-lost-muddy Watershed Dam A-27 is an earth dam located in DeKalb County, Missouri, built in 1969. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 475 ft long, taller than 50% 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-27
The primary purpose of Grindstone-lost-muddy Watershed Dam A-27 is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Gndsn-lst-mdy Cr Wsd Sbd (local government). It impounds the Tr-grindstone Creek near Pattonsburg.
The dam stands 25 feet tall and stretches 475 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 68 acre-feet, and collects water from a drainage area of 108 square miles. Completed in 1969, 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.
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Location
| State | Missouri |
| County | DeKalb |
| Nearest City | Pattonsburg |
| River/Stream | Tr-grindstone Creek |
| Coordinates | 39.74960, -94.32586 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 475 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 68 acre-ft |
| Max Storage | 68 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 108 sq mi |
| Max Discharge | 290 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Gndsn-lst-mdy Cr Wsd Sbd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO10386 |
| Federal ID | MO10386 |
| More Info | State Dam Safety Program |