Grassy Creek Watershed Dam G- 38 is an earth dam located in Lewis County, Missouri, built in 1998. It carries a Low hazard potential classification.
Dam profile
NID height · 41 ft41 ft tall and 700 ft long, taller than 87% 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- 38
The primary purpose of Grassy Creek Watershed Dam G- 38 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 Ck Subdistrict (local government). It impounds the Grassy Creek near Lewistown.
The dam stands 41 feet tall and stretches 700 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 121 acre-feet, and collects water from a drainage area of 364 square miles. Completed in 1998, the structure is 28 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. The most recent inspection on record was 08/06/1999. That was over 27 years ago.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Lewistown |
| River/Stream | Grassy Creek |
| Coordinates | 40.04568, -91.83175 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 25 ft |
| Dam Length | 700 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 121 acre-ft |
| Max Storage | 121 acre-ft |
| Normal Storage | 29 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 364 sq mi |
| Max Discharge | 133 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Grassy Ck Subdistrict |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/06/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50869 |
| Federal ID | MO50869 |
| More Info | State Dam Safety Program |