Hill Annex No. 3 Reservoir Report
Nearby: Hill Annex No. 1 Charter
Last Updated: December 13, 2025
Located in Itasca County, Minnesota, Hill Annex No.
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Summary
3 is a privately owned earth dam constructed in 1954 for tailings management. This dam, standing at a height of 63 feet and spanning 10,700 feet in length, serves the primary purpose of tailings storage with a storage capacity of 3,346 acre-feet. The dam is regulated by the Minnesota Department of Natural Resources (MNDNR EWR) and is subject to state permitting, inspection, and enforcement.
The dam poses a significant hazard potential and has not been rated for its condition assessment as of the last inspection in July 2012. It falls under the jurisdiction of local residents and the St. Paul District of the US Army Corps of Engineers. The dam's primary source agency is the state of Minnesota, and it is situated along the Swan River-Tr. With a drainage area of 0.4 square miles, the dam plays a crucial role in managing water resources in the region and highlights the importance of proper dam maintenance and regulation for climate and water resource enthusiasts.
Despite being a privately owned structure, Hill Annex No. 3's presence underscores the interconnectedness of water resources management, climate resilience, and regulatory oversight. As a key component in the local watershed system, the dam's condition and functionality are essential for ensuring the safety and sustainability of water resources in the area. With its significant hazard potential and state-regulated status, this dam serves as a focal point for ongoing monitoring, inspection, and enforcement efforts to safeguard both the environment and local communities from potential risks associated with dam failure or mismanagement.
Year Completed |
1954 |
Dam Length |
10700 |
Dam Height |
63 |
River Or Stream |
SWAN RIVER-TR |
Primary Dam Type |
Earth |
Drainage Area |
0.4 |
Nid Storage |
3346 |
Structural Height |
63 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
63 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie River Near Taconite
|
63cfs |
Mississippi River At Grand Rapids
|
606cfs |
Mississippi River At Aitkin
|
1010cfs |
St. Louis River At Scanlon
|
693cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Nashwauk Campground
|
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Kom-On-in Beach Campground
|
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American Legion Park - Warba
|
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Warba American Legion
|
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American Legion Park
|
Hill Annex No. 3
Panasa Lake