J.l. Big Reservoir is an earth dam located in Glacier County, Montana. It carries a Low hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall. 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 J.l. Big Reservoir
The primary purpose of J.l. Big Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Duncan Ranch Company (private). It impounds the Sage Creek near Joplin.
The dam stands 24 feet tall, creates a reservoir covering 59 acres, and has a maximum storage capacity of 342 acre-feet.
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 | Glacier |
| Nearest City | Joplin |
| River/Stream | Sage Creek |
| Coordinates | 48.92800, -112.55210 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
Storage & Hydraulics
| NID Storage | 342 acre-ft |
| Max Storage | 342 acre-ft |
| Normal Storage | 342 acre-ft |
| Surface Area | 59 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Duncan Ranch Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03849 |
| Federal ID | MT03849 |
| More Info | State Dam Safety Program |