Grassy Creek Watershed Dam G- 61a is an earth dam located in Lewis County, Missouri, built in 2005. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 440 ft long, taller than 82% 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 Grassy Creek Watershed Dam G- 61a
The primary purpose of Grassy Creek Watershed Dam G- 61a 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 Grassy Creek Ws District (local government). It impounds the Grassy Creek near Lewistown.
The dam stands 36 feet tall and stretches 440 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 97 acre-feet, and collects water from a drainage area of 243 square miles. Completed in 2005, the structure is relatively new.
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 05/01/2005. That was over 21 years ago.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Lewistown |
| River/Stream | Grassy Creek |
| Coordinates | 40.05264, -91.77308 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 27 ft |
| Dam Length | 440 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 97 acre-ft |
| Max Storage | 97 acre-ft |
| Normal Storage | 29 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 243 sq mi |
| Max Discharge | 218 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Grassy Creek Ws District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/01/2005 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO51352 |
| Federal ID | MO51352 |
| More Info | State Dam Safety Program |