Hill Annex No. 1 Reservoir Report
Nearby: Hill Annex No. 3 Charter
Last Updated: December 13, 2025
Hill Annex No.
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Summary
1 is a private dam located in Itasca, Minnesota, specifically in the area of Snowball Creek. This earth dam, completed in 1920, serves as a tailings storage facility with a height of 65 feet and a length of 1500 feet. With a storage capacity of 910 acre-feet, the dam is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections to ensure its structural integrity and safety.
Despite being classified as having a low hazard potential, Hill Annex No. 1 plays a crucial role in the local water resource management system. The dam is situated in a drainage area of 0.9 square miles and is designed to contain tailings material. Although its exact volume is unspecified, the dam's purpose remains vital for environmental protection in the region, underscoring the significance of the ongoing regulatory oversight and maintenance efforts to mitigate any potential risks or hazards associated with its operation.
Owned and operated by a private entity, Hill Annex No. 1 stands as a testament to the collaborative efforts between public and private stakeholders in safeguarding water resources and maintaining infrastructure resilience in the face of changing climatic conditions. With a comprehensive regulatory framework in place, including state jurisdiction, permitting, inspection, and enforcement protocols, the dam exemplifies a commitment to sustainable water management practices that benefit both the local community and the surrounding ecosystem.
Year Completed |
1920 |
Dam Length |
1500 |
Dam Height |
65 |
River Or Stream |
SNOWBALL CREEK-OS |
Primary Dam Type |
Earth |
Drainage Area |
0.9 |
Nid Storage |
910 |
Structural Height |
65 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
65 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie River Near Taconite
|
63cfs |
Mississippi River At Grand Rapids
|
606cfs |
St. Louis River At Scanlon
|
693cfs |
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.
Hill Annex No. 1
Panasa Lake