Grassy Creek Watershed Dam G- 46
Grassy Creek Watershed Dam G- 46 is an earth dam located in Lewis County, Missouri, built in 1991. It carries a Low hazard potential classification.
About Grassy Creek Watershed Dam G- 46
The primary purpose of Grassy Creek Watershed Dam G- 46 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 Lewistown.
The dam stands 28 feet tall and stretches 480 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 87 acre-feet, and collects water from a drainage area of 102 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 26 years ago.
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Location
| State | Missouri |
| County | Lewis |
| Nearest City | Lewistown |
| River/Stream | Little Grassy |
| Coordinates | 40.01152, -91.81946 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 25 ft |
| Dam Length | 480 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 87 acre-ft |
| Max Storage | 87 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 102 sq mi |
| Max Discharge | 107 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | GRASSY CK SUBDISTRICT |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 09/11/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50887 |
| Federal ID | MO50887 |
| More Info | State Dam Safety Program |