Big Gravel Dam 1 is an earth dam located in Hill County, Montana, built in 1952. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 100 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 Big Gravel Dam 1
The primary purpose of Big Gravel Dam 1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by U.s. D.o.i. B.i.a. (rocky Boy Reservation) (federal). It impounds the Gravel Coulee near Laredo.
The dam stands 20 feet tall and stretches 100 feet across, and has a maximum storage capacity of 206 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 | Hill |
| Nearest City | Laredo |
| River/Stream | Gravel Coulee |
| Coordinates | 48.43101, -109.89943 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 100 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 206 acre-ft |
| Max Storage | 206 acre-ft |
| Normal Storage | 106 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | U.s. D.o.i. B.i.a. (rocky Boy Reservation) |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03310 |
| Federal ID | MT03310 |
| More Info | State Dam Safety Program |