Grassy Creek Watershed Dam G- 63 is an earth dam located in Lewis County, Missouri, built in 1991. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 470 ft long, taller than 68% 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- 63
The primary purpose of Grassy Creek Watershed Dam G- 63 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 Little Grassy near Ewing.
The dam stands 30 feet tall and stretches 470 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 199 acre-feet, and collects water from a drainage area of 332 square miles. Completed in 1991, the structure is 35 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 09/11/1999. That was over 27 years ago.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Ewing |
| River/Stream | Little Grassy |
| Coordinates | 40.01314, -91.75364 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 23 ft |
| Dam Length | 470 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 199 acre-ft |
| Max Storage | 199 acre-ft |
| Normal Storage | 45 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 332 sq mi |
| Max Discharge | 250 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 | 09/11/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50889 |
| Federal ID | MO50889 |
| More Info | State Dam Safety Program |