Grassy Creek Watershed Dam G- 40a
Grassy Creek Watershed Dam G- 40a is an earth dam located in Lewis County, Missouri, built in 2006. It carries a Low hazard potential classification.
About Grassy Creek Watershed Dam G- 40a
The primary purpose of Grassy Creek Watershed Dam G- 40a 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 W/s District (local government). It impounds the Grassy Creek near Lewistown.
The dam stands 29 feet tall and stretches 480 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 81 acre-feet, and collects water from a drainage area of 89 square miles. Completed in 2006, 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.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Lewistown |
| River/Stream | Grassy Creek |
| Coordinates | 40.04540, -91.81610 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 25 ft |
| Dam Length | 480 ft |
| Year Completed | 2006 (20 years old) |
Storage & Hydraulics
| NID Storage | 81 acre-ft |
| Max Storage | 81 acre-ft |
| Normal Storage | 22 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 89 sq mi |
| Max Discharge | 3 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | GRASSY CREEK W/S DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO51424 |
| Federal ID | MO51424 |
| More Info | State Dam Safety Program |