Pool No. 1 Reservoir Report
Nearby: Pool No. 7 Pool No. 3
Last Updated: December 12, 2025
Pool No.
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Summary
1, located in Thief River Falls, Minnesota, is a federal-owned earth dam completed in 1967 with a primary purpose of serving as a water resource structure. The dam stands at 11 feet high and spans a length of 8000 feet, holding a storage capacity of 4830 acre-feet. With a low hazard potential and a condition assessment currently not rated, Pool No. 1 plays a crucial role in managing the water resources of the Thief River-TR area.
Despite not being regulated or inspected by the state, Pool No. 1 remains a key feature in the local landscape, with Collin Peterson (D) representing the area in Congress. With a maximum discharge capacity of 1300 cubic feet per second, the dam serves as a vital piece of infrastructure for flood control and water management in the region. The dam's emergency action plan status, risk assessment, and management measures are currently undisclosed, leaving room for future development and improvement in its operations.
As a significant water resource structure in Marshall County, Pool No. 1 provides valuable storage capacity for the surrounding area, with a normal storage level of 1690 acre-feet. While the dam's condition assessment is not rated, its low hazard potential indicates a level of safety for the community. With its completion dating back to 1967, Pool No. 1 continues to play a crucial role in water resource management in the region, ensuring the protection of the surrounding areas from potential flooding events.
Year Completed |
1967 |
Dam Length |
8000 |
Dam Height |
11 |
River Or Stream |
THIEF RIVER-TR |
Primary Dam Type |
Earth |
Nid Storage |
4830 |
Structural Height |
11 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
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.
Pool No. 1