Double Crossing Detention Dam
Double Crossing Detention Dam is a gravity dam located in Valley County, Montana, built in 1962. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About Double Crossing Detention Dam
The primary purpose of Double Crossing Detention Dam 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 Doi Blm (federal). It impounds the Willow Ck./milk River near Nashua.
The dam stands 19 feet tall and stretches 2,245 feet across, creates a reservoir covering 59 acres, has a maximum storage capacity of 323 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1962, 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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. The most recent inspection on record was 10/24/2018.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Willow Ck./milk River |
| Coordinates | 47.98589, -107.05723 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 19 ft |
| Dam Length | 2,245 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 323 acre-ft |
| Max Storage | 323 acre-ft |
| Normal Storage | 316 acre-ft |
| Surface Area | 59 acres |
| Drainage Area | 6 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 10/24/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00738 |
| Federal ID | MT00738 |
| More Info | State Dam Safety Program |