Poison Creek No. 1 is an earth dam located in Johnson County, Wyoming, built in 1999. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 340 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 Poison Creek No. 1
The primary purpose of Poison Creek 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 Springs Ranch, LLC (private). It impounds the Poison Creek near Young Reservoir.
The dam stands 30 feet tall and stretches 340 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 33 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1999, the structure is 27 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/18/2021.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Young Reservoir |
| River/Stream | Poison Creek |
| Coordinates | 44.07870, -106.78670 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 340 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 33 acre-ft |
| Max Storage | 33 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,195 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Springs Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/18/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02385 |
| Federal ID | WY02385 |
| More Info | State Dam Safety Program |