Upper Little Black Watershed Dam A-5 is an earth dam located in Butler County, Missouri, built in 1990. It carries a Low hazard potential classification.
Dam profile
NID height · 46 ft46 ft tall and 730 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Little Black Watershed Dam A-5
The primary purpose of Upper Little Black Watershed Dam A-5 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 Upper Little Black Watershed S (local government). It impounds the Little Black River near Naylor.
The dam stands 46 feet tall and stretches 730 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 570 acre-feet, and collects water from a drainage area of 301 square miles. Completed in 1990, the structure is 36 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 07/01/1993. That was over 33 years ago.
At 46 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Missouri |
| County | Butler |
| Nearest City | Naylor |
| River/Stream | Little Black River |
| Coordinates | 36.72609, -90.60753 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 34 ft |
| Dam Length | 730 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 570 acre-ft |
| Max Storage | 570 acre-ft |
| Normal Storage | 111 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 301 sq mi |
| Max Discharge | 33 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Upper Little Black Watershed S |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/01/1993 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50328 |
| Federal ID | MO50328 |
| More Info | State Dam Safety Program |