South Wall is an earth dam located in Natrona County, Wyoming, built in 1912. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 36 ft36 ft tall and 410 ft long, taller than 82% 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 South Wall
The primary purpose of South Wall is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Antelope Springs Ranch Co (private). It impounds the School Sec Spring Gulch near Arvada.
The dam stands 36 feet tall and stretches 410 feet across, creates a reservoir covering 15 acres, and has a maximum storage capacity of 320 acre-feet. Completed in 1912, the structure is over a century 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/27/2021.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Wyoming |
| County | Natrona |
| Nearest City | Arvada |
| River/Stream | School Sec Spring Gulch |
| Coordinates | 43.42660, -106.58580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 20 ft |
| Dam Length | 410 ft |
| Year Completed | 1912 (114 years old) |
Storage & Hydraulics
| NID Storage | 320 acre-ft |
| Max Storage | 320 acre-ft |
| Normal Storage | 213 acre-ft |
| Surface Area | 15 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Antelope Springs Ranch Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/27/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00864 |
| Federal ID | WY00864 |
| More Info | State Dam Safety Program |