Twin Bridges Wastewater Lagoon Dam Reservoir Report
Nearby: Durham Jackson #1
Last Updated: December 5, 2025
The Twin Bridges Wastewater Lagoon Dam is a crucial water resource infrastructure located in Madison, Montana, along the Big Hole River.
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Summary
Owned by the local government and regulated by the Montana Department of Environmental Quality (DEQ), this dam serves as a vital component of the wastewater treatment system in the area. With a height of 12.5 feet and a storage capacity of 111 acre-feet, it plays a significant role in managing the water resources in the region.
Although the dam's primary purpose is listed as "Other," it is clear that the Twin Bridges Wastewater Lagoon Dam is essential for maintaining water quality and protecting the environment. With a high hazard potential and a regular inspection frequency of 5 years, ensuring the safety and integrity of this structure is of utmost importance. While the condition assessment is currently marked as "Not Rated," ongoing monitoring and maintenance efforts are likely in place to address any potential risks and ensure the continued functionality of the dam.
As a key part of the local water infrastructure, the Twin Bridges Wastewater Lagoon Dam exemplifies the intersection of water resource management and climate resilience. With its location along the Big Hole River and its critical role in wastewater treatment, this dam represents a crucial piece of the puzzle in maintaining water quality and environmental sustainability in the region. Through continued regulation, inspection, and maintenance, this infrastructure will continue to serve its essential purpose for the community and the surrounding ecosystem.
Dam Height |
12.5 |
River Or Stream |
BIG HOLE RIVER |
Hydraulic Height |
11 |
Nid Storage |
111 |
Hazard Potential |
High |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Twin Bridges Wastewater Lagoon Dam