Grassy Creek Watershed Dam G- 84 is an earth dam located in Lewis County, Missouri, built in 1999. It carries a Low hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 590 ft long, taller than 86% 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- 84
The primary purpose of Grassy Creek Watershed Dam G- 84 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 40 feet tall and stretches 590 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 182 acre-feet, and collects water from a drainage area of 384 square miles. Completed in 1999, the structure is 27 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 10/06/1999. That was over 27 years ago.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Ewing |
| River/Stream | Little Grassy |
| Coordinates | 39.98760, -91.75593 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 25 ft |
| Dam Length | 590 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 182 acre-ft |
| Max Storage | 182 acre-ft |
| Normal Storage | 42 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 384 sq mi |
| Max Discharge | 294 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 | 10/06/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50866 |
| Federal ID | MO50866 |
| More Info | State Dam Safety Program |