J Jacobsen #1 is an earth dam located in Daniels County, Montana, built in 1964. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 340 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 J Jacobsen #1
The primary purpose of J Jacobsen #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 John Jacobsen (private). It impounds the Tr-smoke Creek near Blair.
The dam stands 15 feet tall and stretches 340 feet across, has a maximum storage capacity of 156 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | Montana |
| County | Daniels |
| Nearest City | Blair |
| River/Stream | Tr-smoke Creek |
| Coordinates | 48.59867, -105.11969 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 340 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 156 acre-ft |
| Max Storage | 156 acre-ft |
| Normal Storage | 62 acre-ft |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | John Jacobsen |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02638 |
| Federal ID | MT02638 |
| More Info | State Dam Safety Program |