Swan is an earth dam located in Laramie County, Wyoming, built in 1907. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 1,450 ft long, taller than 50% 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 Swan
The primary purpose of Swan is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Dyno Nobel, Inc. (private). It impounds the Clear Creek near Cheyenne.
The dam stands 25 feet tall and stretches 1,450 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 356 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1907, the structure is over a century 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 04/11/2024.
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Location
| State | Wyoming |
| County | Laramie |
| Nearest City | Cheyenne |
| River/Stream | Clear Creek |
| Coordinates | 41.10100, -104.86900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 1,450 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 356 acre-ft |
| Max Storage | 356 acre-ft |
| Normal Storage | 247 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 72 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Dyno Nobel, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/11/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WY00009 |
| Federal ID | WY00009 |
| More Info | State Dam Safety Program |