Cottonwood Field Station is an earth dam located in Jackson County, South Dakota, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 500 ft long. 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 Cottonwood Field Station
The primary purpose of Cottonwood Field Station is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by S&pl (state). It impounds the Tr-bad River.
The dam stands 18 feet tall and stretches 500 feet across, and has a maximum storage capacity of 126 acre-feet. Completed in 1937, 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 11/01/2023.
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Location
| State | South Dakota |
| County | Jackson |
| Nearest City | None |
| River/Stream | Tr-bad River |
| Coordinates | 43.95407, -101.85666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 500 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 126 acre-ft |
| Max Storage | 126 acre-ft |
| Normal Storage | 72 acre-ft |
| Max Discharge | 1,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/01/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01987 |
| Federal ID | SD01987 |
| More Info | State Dam Safety Program |