Upper Rock Creek is an earth dam located in Fremont County, Wyoming, built in 1961. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 101 ft101 ft tall and 720 ft long, taller than 98% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Rock Creek
Upper Rock Creek is a dam in Fremont, Wyoming. The dam is owned by City of Casper, Att: Clint Conner (private). It impounds the Rock Creek near Atlantic City.
The dam stands 101 feet tall and stretches 720 feet across, creates a reservoir covering 68 acres, has a maximum storage capacity of 3,158 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1961, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 06/24/2024.
At 101 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Wyoming |
| County | Fremont |
| Nearest City | Atlantic City |
| River/Stream | Rock Creek |
| Coordinates | 42.54800, -108.76400 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 101 ft |
| Dam Height | 101 ft |
| Dam Length | 720 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 3,158 acre-ft |
| Max Storage | 3,158 acre-ft |
| Normal Storage | 2,800 acre-ft |
| Surface Area | 68 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 2,200 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | City of Casper, Att: Clint Conner |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/24/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00425 |
| Federal ID | WY00425 |
| More Info | State Dam Safety Program |