Underdal #1 is an earth dam located in Toole County, Montana, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 400 ft long. 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 Underdal #1
The primary purpose of Underdal #1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ted R Underdal (private). It impounds the Timber Coulee near Loma.
The dam stands 19 feet tall and stretches 400 feet across, creates a reservoir covering 14 acres, and has a maximum storage capacity of 84 acre-feet. Completed in 1963, 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 | Toole |
| Nearest City | Loma |
| River/Stream | Timber Coulee |
| Coordinates | 48.28230, -111.29330 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 400 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 84 acre-ft |
| Max Storage | 84 acre-ft |
| Normal Storage | 44 acre-ft |
| Surface Area | 14 acres |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ted R Underdal |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00420 |
| Federal ID | MT00420 |
| More Info | State Dam Safety Program |