Jackson #1
Jackson #1 is an earth dam located in Madison County, Montana, built in 1924. It carries a Significant hazard potential classification.
About Jackson #1
The primary purpose of Jackson #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Unknown. It impounds the Wisconsin Creek near Twin Bridges.
The dam stands 19 feet tall and stretches 202 feet across, creates a reservoir covering 4 acres, and has a storage capacity of 38 acre-feet. Completed in 1924, the structure is over a century 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. The most recent inspection on record was 07/16/2014. That was over 11 years ago.
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Location
| State | Montana |
| County | Madison |
| Nearest City | Twin Bridges |
| River/Stream | Wisconsin Creek |
| Coordinates | 45.58081, -112.09969 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 202 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 38 acre-ft |
| Normal Storage | 38 acre-ft |
| Surface Area | 4 acres |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | UNKNOWN |
| Owner Type | Not Listed |
| Hazard Classification | Significant |
| Last Inspection | 07/16/2014 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00828 |
| Federal ID | MT00828 |
| More Info | State Dam Safety Program |