Slates No. 1 is an earth dam located in Converse County, Wyoming, built in 1956. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 27 ft27 ft tall and 594 ft long, taller than 59% 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 Slates No. 1
The primary purpose of Slates 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 J.p. Werner & Sons, Inc. (private). It impounds the Slates Draw near Edgemont Sd.
The dam stands 27 feet tall and stretches 594 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 77 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1956, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/12/2024.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Edgemont Sd |
| River/Stream | Slates Draw |
| Coordinates | 43.06917, -105.13167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 594 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 77 acre-ft |
| Max Storage | 77 acre-ft |
| Normal Storage | 47 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | J.p. Werner & Sons, Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/12/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00612 |
| Federal ID | WY00612 |
| More Info | State Dam Safety Program |