Porta is an earth dam located in Custer County, Montana, built in 1954. It carries a Low hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 792 ft long, taller than 59% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Porta
The primary purpose of Porta is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Northern Pacific R R Co (private). It impounds the Freddie Creek near Terry.
The dam stands 27 feet tall and stretches 792 feet across, and has a maximum storage capacity of 123 acre-feet. Completed in 1954, 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Custer |
| Nearest City | Terry |
| River/Stream | Freddie Creek |
| Coordinates | 46.51500, -105.34920 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 792 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 76 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Northern Pacific R R Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01215 |
| Federal ID | MT01215 |
| More Info | State Dam Safety Program |