Pr-110 Retention Dam Reservoir Report
Nearby: Tarawa Retention Dam Simple Simon Dam
Last Updated: December 5, 2025
The Pr-110 Retention Dam, located in Hinsdale, Montana, serves multiple purposes including fire protection, stock watering, and small fish pond creation.
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Summary
Owned and funded by the Bureau of Land Management, this gravity dam was completed in 1936 and stands at a structural height of 21 feet with a hydraulic height of 15 feet. With a storage capacity of 114.4 acre-feet and a surface area of 16.7 acres, this dam plays a crucial role in the conservation and management of water resources in the area.
Although classified as having low hazard potential, the Pr-110 Retention Dam has not been rated for its condition assessment as of the last inspection in August 2016. Despite being regulated by the Bureau of Land Management, this dam does not fall under state jurisdiction, permitting, inspection, or enforcement. With its proximity to Cottonwood Creek and the Milk River, this dam contributes to the local ecosystem while providing essential services to the surrounding community. Water resource and climate enthusiasts can appreciate the historical significance and functional importance of the Pr-110 Retention Dam in maintaining the delicate balance of water management in Phillips County, Montana.
Year Completed |
1936 |
Dam Length |
608 |
River Or Stream |
COTTONWOOD CK./MILK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
16.7 |
Hydraulic Height |
15 |
Drainage Area |
0.5 |
Nid Storage |
114.4 |
Structural Height |
21 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
21 |
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.
Pr-110 Retention Dam