Grindstone-lost-muddy Watershed Dam C-39b is an earth dam located in DeKalb County, Missouri, built in 1975. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 500 ft long. 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 C-39b
The primary purpose of Grindstone-lost-muddy Watershed Dam C-39b 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 Gnsn-ls-md Wsd Sbdstrict (local government). It impounds the Tr-lost Creek near Pattonsburg.
The dam stands 20 feet tall and stretches 500 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 93 acre-feet, and collects water from a drainage area of 380 square miles. Completed in 1975, 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-lost Creek |
| Coordinates | 40.01733, -94.48292 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 500 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 93 acre-ft |
| Max Storage | 93 acre-ft |
| Normal Storage | 33 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 380 sq mi |
| Max Discharge | 350 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Gnsn-ls-md Wsd Sbdstrict |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50096 |
| Federal ID | MO50096 |
| More Info | State Dam Safety Program |