Jolin Dam; Warren Reservoir Report

Last Updated: December 13, 2025

Jolin Dam in Warren, North Dakota, is a vital water resource managed by the local government with regulatory oversight from the North Dakota State Water Commission.


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Summary

Built in 1935 by the USDA NRCS, this earth dam on the Maple River serves primarily for recreation, offering a storage capacity of 320 acre-feet and a normal storage of 151 acre-feet. With a height of 19 feet and a length of 850 feet, Jolin Dam provides a scenic spot for outdoor enthusiasts to enjoy various water-based activities.

Despite its low hazard potential, Jolin Dam underwent structural modifications in 1966 to enhance its safety and stability. The dam features an uncontrolled spillway with a width of 100 feet, ensuring efficient water release during high flow events. While the condition assessment is currently not rated, the risk assessment indicates a moderate level of risk, prompting the need for continued monitoring and risk management measures. With its picturesque location and recreational opportunities, Jolin Dam remains a valuable asset for the community and a hub for water resource and climate enthusiasts to explore and appreciate.

Years Modified

1966 - Structural

Year Completed

1935

Dam Length

850

Dam Height

19

River Or Stream

MAPLE RIVER (JAMES)-TR

Primary Dam Type

Earth

Drainage Area

9.13

Nid Storage

320

Structural Height

22

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.