Martinsdale Reservoir Report
Nearby: Martinsdale, North Dam Third Stooges
Last Updated: December 5, 2025
Martinsdale, East Dam in Two Dot, Montana, is a state-owned earth dam constructed in 1939 for irrigation purposes on the TR-Musselshell River.
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Summary
Standing at a height of 49 feet and with a length of 1550 feet, the dam has a maximum storage capacity of 38,958 acre-feet and serves a drainage area of 15.7 square miles. Despite its uncontrolled spillway and high hazard potential, the dam has been deemed to be in satisfactory condition as of its last assessment in March 2021.
Located in Wheatland County, Martinsdale, East Dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections with a frequency of every 5 years. The dam's risk assessment has classified it as having a moderate risk level, with emergency action plans in place for potential incidents. It is situated within Congressional District 00, Montana, and falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers. With its critical role in irrigation and water resource management, Martinsdale, East Dam represents a vital infrastructure project in the region for both agricultural and environmental purposes.
Year Completed |
1939 |
Dam Length |
1550 |
Dam Height |
49 |
River Or Stream |
TR-MUSSELSHELL RIVER |
Primary Dam Type |
Earth |
Surface Area |
985 |
Hydraulic Height |
49 |
Drainage Area |
15.7 |
Nid Storage |
38958 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
49 |
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.
Martinsdale, East Dam