O'halloran #1 is an earth dam located in Park County, Montana, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 200 ft long. 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 O'halloran #1
The primary purpose of O'halloran #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Gene F Marelius (private). It impounds the Looking Glass Creek near Clyde Park.
The dam stands 23 feet tall and stretches 200 feet across, and has a maximum storage capacity of 149 acre-feet. Completed in 1958, 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.
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Location
| State | Montana |
| County | Park |
| Nearest City | Clyde Park |
| River/Stream | Looking Glass Creek |
| Coordinates | 45.90990, -110.63660 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 200 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 149 acre-ft |
| Max Storage | 149 acre-ft |
| Normal Storage | 71 acre-ft |
| Max Discharge | 500 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Gene F Marelius |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01597 |
| Federal ID | MT01597 |
| More Info | State Dam Safety Program |