Pyba Reservoir is an earth dam located in Garfield County, Montana, built in 1952. It carries a Significant hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 2,400 ft long, taller than 62% 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 Pyba Reservoir
The primary purpose of Pyba Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Wallace Pettit (private). It impounds the Thompson Creek near Jordan.
The dam stands 28 feet tall and stretches 2,400 feet across, and has a maximum storage capacity of 590 acre-feet. Completed in 1952, the structure is well into its service life at over 50 years 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.
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Location
| State | Montana |
| County | Garfield |
| Nearest City | Jordan |
| River/Stream | Thompson Creek |
| Coordinates | 46.85420, -106.49360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 2,400 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 590 acre-ft |
| Max Storage | 590 acre-ft |
| Normal Storage | 386 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Wallace Pettit |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01082 |
| Federal ID | MT01082 |
| More Info | State Dam Safety Program |