Ann Lake Reservoir Report
Nearby: Knife Lake Blowers Dam
Last Updated: December 5, 2025
Ann Lake, also known as Peal Memorial Pond, is a picturesque water resource located in Mora, Minnesota.
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Summary
Managed by the Minnesota Department of Natural Resources, this state-regulated lake sits on the Ann River and covers a surface area of 363 acres with a maximum discharge capacity of 250 cubic feet per second. Built in 1966, the dam at Ann Lake has a structural height of 25 feet and a hydraulic height of 1 foot, serving a primary purpose that goes beyond traditional water management.
With a low hazard potential and satisfactory condition assessment, Ann Lake provides a tranquil environment for outdoor enthusiasts and climate researchers alike. The lake boasts a storage capacity of 3,670 acre-feet and a drainage area of 56 square miles, making it a valuable asset for both recreational and ecological purposes. Despite its uncontrolled spillway type and moderate risk assessment, Ann Lake remains a gem in the Kanabec County landscape, offering a unique blend of natural beauty and water resource management.
Year Completed |
1966 |
Dam Length |
135 |
Dam Height |
15 |
River Or Stream |
ANN RIVER |
Primary Dam Type |
Other |
Surface Area |
363 |
Hydraulic Height |
1 |
Drainage Area |
56 |
Nid Storage |
3670 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
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 At Aitkin
|
1010cfs |
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.
Ann Lake