Delmar Reservoir Report
Nearby: Echo Reservoir A C Lincoln
Last Updated: December 20, 2025
Delmar is a privately owned irrigation dam located in Loma, Montana, along the TR-Marias River.
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Summary
Built in 1914, this earth dam stands at a height of 20 feet and has a storage capacity of 82 acre-feet, serving the primary purpose of irrigation in the area. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC), ensuring that it meets state inspection and enforcement standards.
Despite being classified as having a low hazard potential, Delmar has not been rated for its condition assessment. The dam has not been modified over the years and does not have an emergency action plan in place. While the risk assessment and management measures for Delmar are currently unknown, the dam remains an essential infrastructure for water resource management in Liberty County, Montana. With its historical significance and purpose in supporting agricultural activities, Delmar continues to play a vital role in the local community's water supply.
As a structure that contributes to the overall irrigation system in the area, Delmar is a key component in supporting agricultural activities along the TR-Marias River. With its modest height and storage capacity, the dam provides essential water resources for the surrounding farmlands. While the dam's condition assessment and emergency preparedness may need further evaluation, its presence underscores the importance of maintaining and monitoring water infrastructure to ensure the sustainable use of resources in the region.
Year Completed |
1914 |
Dam Length |
80 |
Dam Height |
20 |
River Or Stream |
TR-MARIAS RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
4 |
Nid Storage |
82 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Delmar