J B Long and Company #3 is an earth dam located in Lewis and Clark County, Montana, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 34 ft34 ft tall and 530 ft long, taller than 78% 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 J B Long and Company #3
The primary purpose of J B Long and Company #3 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by State of Montana, D.n.r.c., T.l.m.d. (state). It impounds the Diffused Surface Water near Simms.
The dam stands 34 feet tall and stretches 530 feet across, and has a maximum storage capacity of 62 acre-feet. Completed in 1950, the structure is well-established, with more than 75 years of service.
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.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Montana |
| County | Lewis and Clark |
| Nearest City | Simms |
| River/Stream | Diffused Surface Water |
| Coordinates | 47.47370, -112.55460 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 530 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Normal Storage | 38 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | State of Montana, D.n.r.c., T.l.m.d. |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03289 |
| Federal ID | MT03289 |
| More Info | State Dam Safety Program |