Geddes is an earth dam located in Charles Mix County, South Dakota, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall and 1,040 ft long, taller than 65% 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 Geddes
The primary purpose of Geddes is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by S&pl (state). It impounds the Pease Creek.
The dam stands 29 feet tall and stretches 1,040 feet across, creates a reservoir covering 41 acres, has a maximum storage capacity of 2,100 acre-feet, and collects water from a drainage area of 40 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 10/03/2022.
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Location
| State | South Dakota |
| County | Charles Mix |
| Nearest City | None |
| River/Stream | Pease Creek |
| Coordinates | 43.18732, -98.71185 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 1,040 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 2,100 acre-ft |
| Max Storage | 2,100 acre-ft |
| Normal Storage | 820 acre-ft |
| Surface Area | 41 acres |
| Drainage Area | 40 sq mi |
| Max Discharge | 10,612 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/03/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00009 |
| Federal ID | SD00009 |
| More Info | State Dam Safety Program |