Pool No. 27 Reservoir Report
Nearby: Pool No. 11 Pool No. 15
Last Updated: December 13, 2025
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Summary
27, also known as Agassiz Pool, is a federal-owned water resource located in Thief River Falls, Minnesota. Built in 1938, this Earth-type dam stands at a height of 16 feet and stretches for a length of 1000 feet, with a NID storage capacity of 61310 acre-feet. The primary purpose of this dam is listed as "Other", with a low hazard potential and a condition assessment of "Not Rated".
Situated on the Thief River, Pool No. 27 serves as a vital resource for the surrounding area, providing a maximum discharge capacity of 25500 cubic feet per second. Despite not being state-regulated or inspected, this dam plays a crucial role in flood control and water management efforts in the region. With its historical significance and strategic location, Pool No. 27 remains a key part of the water infrastructure in Marshall County, Minnesota.
As water resource and climate enthusiasts continue to monitor and study the impact of dams on our environment, Pool No. 27 stands out as a noteworthy structure with a rich history and important role in the local ecosystem. While its condition assessment is currently marked as "Not Rated", ongoing efforts to assess and manage risk associated with this dam will be crucial in ensuring its continued safety and functionality for years to come.
Year Completed |
1938 |
Dam Length |
1000 |
Dam Height |
16 |
River Or Stream |
THIEF RIVER |
Primary Dam Type |
Earth |
Nid Storage |
61310 |
Structural Height |
16 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
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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. 27