Dolores No. 1
Dolores No. 1 is an earth dam located in Niobrara County, Wyoming, built in 1953. It carries a Low hazard potential classification and has a fair condition assessment.
About Dolores No. 1
The primary purpose of Dolores No. 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Tollman Ranch (private). It impounds the Dolores Draw near Edgemont, Sd.
The dam stands 27 feet tall and stretches 678 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 107 acre-feet. Completed in 1953, 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 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 04/22/2024.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont, Sd |
| River/Stream | Dolores Draw |
| Coordinates | 42.93417, -104.07361 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 678 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 107 acre-ft |
| Max Storage | 107 acre-ft |
| Normal Storage | 61 acre-ft |
| Surface Area | 8 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | TOLLMAN RANCH |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/22/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00767 |
| Federal ID | WY00767 |
| More Info | State Dam Safety Program |