Carbone Flood Control Dam
Carbone Flood Control Dam is an earth dam located in Big Horn County, Montana, built in 2002. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Carbone Flood Control Dam
The primary purpose of Carbone Flood Control Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Navajo Transitional Energy Company (private). It impounds the North Fork Spring Creek near Decker.
The dam stands 32 feet tall and stretches 2,400 feet across, and has a maximum storage capacity of 1,050 acre-feet. Completed in 2002, the structure is relatively new.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/22/2022.
At 32 feet, this dam is taller than 76% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Montana dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Big Horn |
| Nearest City | Decker |
| River/Stream | North Fork Spring Creek |
| Coordinates | 45.11344, -106.95101 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 2,400 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 1,050 acre-ft |
| Max Storage | 1,050 acre-ft |
| Normal Storage | 327 acre-ft |
| Max Discharge | 14,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | NAVAJO TRANSITIONAL ENERGY COMPANY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/22/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MT03852 |
| Federal ID | MT03852 |
| More Info | State Dam Safety Program |