No. Decker Flood Control Reservoir No. 2 is an earth dam located in Big Horn County, Montana. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 52 ft52 ft tall, taller than 93% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About No. Decker Flood Control Reservoir No. 2
The primary purpose of No. Decker Flood Control Reservoir No. 2 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Decker Coal Company (private).
The dam stands 52 feet tall, has a maximum storage capacity of 287 acre-feet, and collects water from a drainage area of 13 square miles.
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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/24/2011. That was over 15 years ago.
At 52 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Montana |
| County | Big Horn |
| Nearest City | Decker |
| Coordinates | 45.08926, -106.85356 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Height | 52 ft |
Storage & Hydraulics
| NID Storage | 287 acre-ft |
| Max Storage | 287 acre-ft |
| Normal Storage | 287 acre-ft |
| Drainage Area | 13 sq mi |
| Max Discharge | 1,243 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Decker Coal Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/24/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03976 |
| Federal ID | MT03976 |
| More Info | State Dam Safety Program |