Warren Lake Reservoir Report
Last Updated: December 12, 2025
Warren Lake, located in Cottonwood County, Minnesota, is a state-regulated reservoir managed by the Minnesota Department of Natural Resources.
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Summary
Built in 1939, this gravity dam stands at a height of 13 feet and spans 44 feet in length, with a storage capacity of 1064 acre-feet and a normal storage level of 665 acre-feet. The reservoir covers a surface area of 140 acres and serves as a crucial water resource for the local community, with a maximum discharge capacity of 535 cubic feet per second.
Despite its age, Warren Lake's dam is assessed to be in fair condition with a low hazard potential, making it a relatively safe and stable structure. The reservoir is primarily used for purposes other than flood control or hydroelectric power generation, and its controlled spillway ensures proper water management during periods of high flow. The risk assessment for Warren Lake indicates a very high risk level, underscoring the importance of ongoing monitoring and maintenance to ensure the safety and integrity of the dam for water resource and climate enthusiasts in the area.
Warren Lake's association with the Division Creek and its strategic location in Windom, Minnesota, make it a valuable asset for both water supply and ecological preservation. With its historical significance and continued importance in water management, Warren Lake stands as a testament to the state's commitment to sustainable water resource practices. As climate change impacts become more pronounced, the reservoir's role in water storage and regulation will only become more critical, highlighting the need for proactive measures to safeguard this vital resource for future generations.
Year Completed |
1939 |
Dam Length |
44 |
Dam Height |
13 |
River Or Stream |
DIVISION CREEK |
Primary Dam Type |
Gravity |
Surface Area |
140 |
Drainage Area |
20.7 |
Nid Storage |
1064 |
Structural Height |
13 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Des Moines River At Jackson
|
55cfs |
Cottonwood River Near New Ulm
|
215cfs |
Redwood River Near Redwood Falls
|
53cfs |
Minnesota River At New Ulm
|
1130cfs |
Little Cottonwood River Near Courtland
|
33cfs |
Minnesota River At Morton
|
1750cfs |
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.
Warren Lake