Triple Crossing is an earth dam located in Valley County, Montana, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 2,313 ft long, taller than 80% 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 Triple Crossing
The primary purpose of Triple Crossing is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Page-whitham (private). It impounds the Lone Tree Creek near Nashua.
The dam stands 35 feet tall and stretches 2,313 feet across, and has a maximum storage capacity of 6,272 acre-feet. Completed in 1961, 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.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Lone Tree Creek |
| Coordinates | 47.97910, -107.11730 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 2,313 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 6,272 acre-ft |
| Max Storage | 6,272 acre-ft |
| Normal Storage | 4,358 acre-ft |
| Max Discharge | 2,140 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Page-whitham |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00689 |
| Federal ID | MT00689 |
| More Info | State Dam Safety Program |