Simmons
Simmons is an earth dam located in Johnson County, Wyoming, built in 1962. It carries a Low hazard potential classification and has a fair condition assessment.
About Simmons
The primary purpose of Simmons 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 Mark Lyman Revocable Trust, Mark Lyman Trustee (private). It impounds the Simmons Draw.
The dam stands 25 feet tall and stretches 499 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 49 acre-feet. Completed in 1962, 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 09/01/2021.
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Location
| State | Wyoming |
| County | Johnson |
| River/Stream | Simmons Draw |
| Coordinates | 43.95770, -107.02610 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 499 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 49 acre-ft |
| Max Storage | 49 acre-ft |
| Normal Storage | 34 acre-ft |
| Surface Area | 3 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | MARK LYMAN REVOCABLE TRUST, MARK LYMAN TRUSTEE |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/01/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01860 |
| Federal ID | WY01860 |
| More Info | State Dam Safety Program |