Spun
Spun is an earth dam located in Cascade County, Montana, built in 1960. It carries a Significant hazard potential classification.
About Spun
The primary purpose of Spun is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Vonne Hall (private). It impounds the Tr-missouri River near Ulm.
The dam stands 15 feet tall and stretches 80 feet across, and has a maximum storage capacity of 248 acre-feet. Completed in 1960, 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 | Cascade |
| Nearest City | Ulm |
| River/Stream | Tr-missouri River |
| Coordinates | 47.37000, -111.76360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 80 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 248 acre-ft |
| Max Storage | 248 acre-ft |
| Normal Storage | 53 acre-ft |
Ownership & Safety
| Purpose | Water Supply |
| Owner | VONNE HALL |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03299 |
| Federal ID | MT03299 |
| More Info | State Dam Safety Program |