South Fork Blackwater River Dam A-21
South Fork Blackwater River Dam A-21 is an earth dam located in Johnson County, Missouri, built in 1964. It carries a Low hazard potential classification.
About South Fork Blackwater River Dam A-21
The primary purpose of South Fork Blackwater River Dam A-21 is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by S.fk.blkwtr.wshd.subdst (local government). It impounds the W.branch S.fk Blackwater near Kingsville, Mo.
The dam stands 28 feet tall and stretches 790 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 283 acre-feet, and collects water from a drainage area of 32 square miles. Completed in 1964, the structure is well into its service life at over 50 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.
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Location
| State | Missouri |
| County | Johnson |
| Nearest City | Kingsville, Mo |
| River/Stream | W.branch S.fk Blackwater |
| Coordinates | 38.84846, -94.07897 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 26 ft |
| Dam Length | 790 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 283 acre-ft |
| Max Storage | 283 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 32 sq mi |
| Max Discharge | 770 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | S.FK.BLKWTR.WSHD.SUBDST |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO20021 |
| Federal ID | MO20021 |
| More Info | State Dam Safety Program |