Porrini
Porrini is an earth dam located in Lewis and Clark County, Montana, built in 1952. It carries a Low hazard potential classification.
About Porrini
The primary purpose of Porrini is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Dolphus Dawson (private). It impounds the Tr-north Fork Willow Creek.
The dam stands 10 feet tall and stretches 1,045 feet across, and has a maximum storage capacity of 217 acre-feet. Completed in 1952, 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 | Lewis and Clark |
| Nearest City | None |
| River/Stream | Tr-north Fork Willow Creek |
| Coordinates | 47.53900, -112.51790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 1,045 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 217 acre-ft |
| Max Storage | 217 acre-ft |
| Normal Storage | 111 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | DOLPHUS DAWSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01109 |
| Federal ID | MT01109 |
| More Info | State Dam Safety Program |