Kiewit No. 1 is an earth dam located in Sheridan County, Wyoming, built in 1964. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 1,200 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 Kiewit No. 1
The primary purpose of Kiewit 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 X-x Ranch, LLC, Att: David Hannahs (private). It impounds the East Pass Creek near Wyola, Mt.
The dam stands 30 feet tall and stretches 1,200 feet across, creates a reservoir covering 11 acres, and has a maximum storage capacity of 158 acre-feet. Completed in 1964, 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 05/23/2024.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Sheridan |
| Nearest City | Wyola, Mt |
| River/Stream | East Pass Creek |
| Coordinates | 44.96083, -107.46472 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 28 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 158 acre-ft |
| Max Storage | 158 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 11 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | X-x Ranch, LLC, Att: David Hannahs |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/23/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00693 |
| Federal ID | WY00693 |
| More Info | State Dam Safety Program |