Long Lake Reservoir Report
Nearby: Fish Hook River Crow Wing 5th Lake
Last Updated: December 5, 2025
Long Lake in Hubbard, Minnesota, is a state-regulated body of water with a dam completed in 1949 by the Minnesota Department of Natural Resources.
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Summary
This Earth dam, standing at 25 feet high and 150 feet long, serves multiple purposes, including flood control and water storage. With a maximum storage capacity of 57,753 acre-feet and covering an area of 1,863 acres, Long Lake plays a crucial role in managing water resources in the region.
The dam's spillway, controlled in nature, can handle a maximum discharge of 1,000 cubic feet per second, minimizing the risk of flooding in the area. Despite its low hazard potential and satisfactory condition assessment, Long Lake is subject to regular inspections every 8 years to ensure its structural integrity and operational efficiency. With a very high risk assessment rating of 1, Long Lake remains a key feature in the local water resource management system, providing crucial support to the surrounding ecosystem and communities.
Situated on Shell River, Long Lake offers a picturesque setting for water resource and climate enthusiasts to explore the intersection of human infrastructure and natural landscapes. With its history dating back to the mid-20th century and ongoing state regulation, this body of water embodies the delicate balance between conservation and development in the face of changing environmental conditions. As a significant feature in the St. Paul District of Minnesota, Long Lake continues to play a vital role in the region's water management efforts, highlighting the importance of sustainable practices in safeguarding our natural resources for future generations.
Year Completed |
1949 |
Dam Length |
150 |
Dam Height |
15 |
River Or Stream |
SHELL RIVER |
Primary Dam Type |
Other |
Surface Area |
1863 |
Drainage Area |
35 |
Nid Storage |
57753 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Straight River Near Park Rapids
|
46cfs |
Crow Wing River At Nimrod
|
279cfs |
Mississippi River Near Bemidji
|
169cfs |
Crow Wing River Near Pillager
|
708cfs |
Mississippi River At Brainerd
|
972cfs |
Otter Tail River Near Elizabeth
|
111cfs |
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.
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