Twin Bridges Wastewater Lagoon Dam is a dam located in Madison County, Montana. It carries a High hazard potential classification.
Dam profile
NID height · 13 ft13 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 Twin Bridges Wastewater Lagoon Dam
Twin Bridges Wastewater Lagoon Dam is a dam in Madison, Montana. The dam is owned by City of Twin Bridges (local government). It impounds the Big Hole River.
The dam stands 13 feet tall, and has a maximum storage capacity of 111 acre-feet.
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.
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 | Madison |
| River/Stream | Big Hole River |
| Coordinates | 45.55454, -112.32496 |
Physical Characteristics
| NID Height | 13 ft |
| Dam Height | 13 ft |
Storage & Hydraulics
| NID Storage | 111 acre-ft |
| Max Storage | 111 acre-ft |
| Normal Storage | 96 acre-ft |
Ownership & Safety
| Purpose | Other |
| Owner | City of Twin Bridges |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03968 |
| Federal ID | MT03968 |
| More Info | State Dam Safety Program |