Gavins Point Dam - Yankton Dam
Gavins Point Dam - Yankton Dam is an earth dam located in Yankton County, South Dakota, built in 1958. It carries a Low hazard potential classification.
About Gavins Point Dam - Yankton Dam
The primary purpose of Gavins Point Dam - Yankton Dam 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 Usace - Omaha District (federal). It impounds the Missouri River near Yankton.
The dam stands 74 feet tall and stretches 8,700 feet across, creates a reservoir covering 32,000 acres, has a maximum storage capacity of 540,000 acre-feet, and collects water from a drainage area of 16,000 square miles. Completed in 1958, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/23/2021.
At 74 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | South Dakota |
| County | Yankton |
| Nearest City | Yankton |
| River/Stream | Missouri River |
| Coordinates | 42.85069, -97.46152 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 74 ft |
| Dam Length | 8,700 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 540,000 acre-ft |
| Max Storage | 540,000 acre-ft |
| Normal Storage | 375,000 acre-ft |
| Surface Area | 32,000 acres |
| Drainage Area | 16,000 sq mi |
| Max Discharge | 584,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Omaha District |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 08/23/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | SD01094 |
| Federal ID | SD01094S001 |
| More Info | State Dam Safety Program |