Anderson No. 1
Anderson No. 1 is an earth dam located in Niobrara County, Wyoming, built in 1959. It carries a Low hazard potential classification and has a poor condition assessment.
About Anderson No. 1
The primary purpose of Anderson No. 1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Diane Simon (private). It impounds the Sours Draw near Edgemont, Sd.
The dam stands 26 feet tall and stretches 270 feet across, creates a reservoir covering 4 acres, and has a maximum storage capacity of 48 acre-feet. Completed in 1959, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/28/2023.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont, Sd |
| River/Stream | Sours Draw |
| Coordinates | 43.46611, -104.25500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 24 ft |
| Dam Length | 270 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 48 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 28 acre-ft |
| Surface Area | 4 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DIANE SIMON |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/28/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01539 |
| Federal ID | WY01539 |
| More Info | State Dam Safety Program |