South Fork Blackwater F-1
South Fork Blackwater F-1 is an earth dam located in Johnson County, Missouri, built in 1980. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About South Fork Blackwater F-1
The primary purpose of South Fork Blackwater F-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 local government-owned. It impounds the Tr-briar Creek near Holden.
The dam stands 48 feet tall and stretches 780 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 165 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1980, the structure is 46 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 12/02/2020.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Missouri |
| County | Johnson |
| Nearest City | Holden |
| River/Stream | Tr-briar Creek |
| Coordinates | 38.74869, -93.90709 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 780 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 165 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 4,813 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/02/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MO20744 |
| Federal ID | MO20744 |
| More Info | State Dam Safety Program |