James Thompson No. 1 Stock is an earth dam located in Niobrara County, Wyoming, built in 1960. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 627 ft long, taller than 68% 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 James Thompson No. 1 Stock
The primary purpose of James Thompson No. 1 Stock 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 Ranchland Inc, Attn: Shannon Bruegger (private). It impounds the Thompson East Draw near Edgemont S D.
The dam stands 30 feet tall and stretches 627 feet across, creates a reservoir covering 10 acres, and has a maximum storage capacity of 109 acre-feet. Completed in 1960, 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 08/29/2022.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont S D |
| River/Stream | Thompson East Draw |
| Coordinates | 43.27670, -104.69960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 627 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 109 acre-ft |
| Max Storage | 109 acre-ft |
| Normal Storage | 77 acre-ft |
| Surface Area | 10 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Ranchland Inc, Attn: Shannon Bruegger |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/29/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00435 |
| Federal ID | WY00435 |
| More Info | State Dam Safety Program |