Upper Little Black Watershed Dam D-12 is an earth dam located in Ripley County, Missouri, built in 1998. It carries a Low hazard potential classification.
Dam profile
NID height · 34 ft34 ft tall and 940 ft long, taller than 78% 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 Upper Little Black Watershed Dam D-12
The primary purpose of Upper Little Black Watershed Dam D-12 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 Little Black Subdistrict (local government). It impounds the Spell Branch to Little Black near Sucess Ark..
The dam stands 34 feet tall and stretches 940 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 643 acre-feet, and collects water from a drainage area of 60 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.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Missouri |
| County | Ripley |
| Nearest City | Sucess Ark. |
| River/Stream | Spell Branch to Little Black |
| Coordinates | 36.67883, -90.59434 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 31 ft |
| Dam Length | 940 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 643 acre-ft |
| Max Storage | 643 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 60 sq mi |
| Max Discharge | 418 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Little Black Subdistrict |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50438 |
| Federal ID | MO50438 |
| More Info | State Dam Safety Program |