Thielen #1
Thielen #1 is an earth dam located in Fallon County, Montana, built in 1962. It carries a Low hazard potential classification.
About Thielen #1
The primary purpose of Thielen #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Thielen Ranch Co (private). It impounds the Tr-pennel Creek near Mildred.
The dam stands 10 feet tall and stretches 400 feet across, has a maximum storage capacity of 79 acre-feet, and collects water from a drainage area of 1 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.
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Location
| State | Montana |
| County | Fallon |
| Nearest City | Mildred |
| River/Stream | Tr-pennel Creek |
| Coordinates | 46.47420, -104.41970 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 400 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 79 acre-ft |
| Max Storage | 79 acre-ft |
| Normal Storage | 10 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 600 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | THIELEN RANCH CO |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02429 |
| Federal ID | MT02429 |
| More Info | State Dam Safety Program |