South Fork Blackwater River Dam A- 1 is an earth dam located in Johnson County, Missouri, built in 1964. It carries a High hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 960 ft long, taller than 72% 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 South Fork Blackwater River Dam A- 1
The primary purpose of South Fork Blackwater River Dam A- 1 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 So.fk.blackwater Sub-dis (private). It impounds the E.br.s.fk. Blackwater near Kingsville, Mo.
The dam stands 31 feet tall and stretches 960 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 656 acre-feet, and collects water from a drainage area of 19 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. The most recent inspection on record was 06/26/1980. That was 46 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Missouri dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Missouri |
| County | Johnson |
| Nearest City | Kingsville, Mo |
| River/Stream | E.br.s.fk. Blackwater |
| Coordinates | 38.81845, -94.08223 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 29 ft |
| Dam Length | 960 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 656 acre-ft |
| Max Storage | 656 acre-ft |
| Normal Storage | 85 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 19 sq mi |
| Max Discharge | 2,070 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | So.fk.blackwater Sub-dis |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 06/26/1980 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO20020 |
| Federal ID | MO20020 |
| More Info | State Dam Safety Program |