Blowers Dam Reservoir Report
Nearby: Clayton Berg Ann Lake
Last Updated: December 5, 2025
Blowers Dam, located in Grasston, Minnesota, is a privately owned structure managed by the USDA NRCS.
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Summary
Built in 1967, this earth dam on the Ann River serves primarily as a Fish and Wildlife Pond, with a storage capacity of 619 acre-feet and a surface area of 69 acres. The dam stands at a height of 10 feet and stretches 600 feet in length, providing vital support for the surrounding ecosystem.
Managed by the Minnesota Department of Natural Resources, Blowers Dam is regulated, inspected, and enforced to ensure its safety and functionality. With a low hazard potential and a satisfactory condition assessment, the dam poses moderate risk and is equipped with uncontrolled spillways and outlet gates. Although last inspected in 2016, the dam continues to meet regulatory guidelines and plays a crucial role in water resource management in Kanabec County.
For water resource and climate enthusiasts, Blowers Dam is not just a structure but a key component of the local landscape. Its presence supports fish and wildlife habitats, regulates water flow on the Ann River, and contributes to the overall ecological health of the region. As efforts continue to maintain and monitor this essential dam, its significance in sustaining the natural environment remains paramount for both current and future generations.
Year Completed |
1967 |
Dam Length |
600 |
Dam Height |
10 |
River Or Stream |
ANN RIVER |
Primary Dam Type |
Earth |
Surface Area |
69 |
Drainage Area |
1.51 |
Nid Storage |
619 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Snake River Near Pine City
|
127cfs |
Kettle River Below Sandstone
|
170cfs |
Rum River Near St. Francis
|
209cfs |
Elk River Near Big Lake
|
274cfs |
Mississippi River At St. Cloud
|
1950cfs |
Mississippi River Near Royalton
|
2290cfs |
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.
Blowers Dam