Porta Reservoir No. 2 Reservoir Report
Nearby: Hansen Lake Dam Andy Capp
Last Updated: December 14, 2025
Porta Reservoir No.
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Summary
2, located in Medicine Lake, Montana, is a privately-owned earth dam completed in 1963 for the primary purpose of recreation. With a dam height of 22 feet and a storage capacity of 114 acre-feet, this reservoir on Lake Creek offers opportunities for fishing, wildlife viewing, and other outdoor activities in a picturesque setting. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is considered to have a significant hazard potential.
Situated in Roosevelt County, Montana, Porta Reservoir No. 2 covers a drainage area of 31.84 square miles and spans a length of 3600 feet. While the condition assessment of the dam is currently not rated, regular inspections, permitting, and enforcement by state agencies ensure its safety and compliance with regulations. Despite the lack of spillway information and inundation maps, the reservoir provides a valuable water resource for the local community and contributes to the conservation of fish and wildlife in the area.
As a key recreational spot in the region, Porta Reservoir No. 2 serves as a vital hub for outdoor enthusiasts and nature lovers. Its strategic location, along with its historical significance and scenic beauty, make it a popular destination for visitors seeking to immerse themselves in the natural wonders of Montana. With its commitment to environmental stewardship and water management, this reservoir plays a crucial role in sustaining the delicate balance of ecosystems and supporting the diverse aquatic habitats in the surrounding area.
Year Completed |
1963 |
Dam Length |
3600 |
Dam Height |
22 |
River Or Stream |
LAKE CREEK |
Primary Dam Type |
Earth |
Drainage Area |
31.84 |
Nid Storage |
114 |
Structural Height |
22 |
Hazard Potential |
Significant |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Porta Reservoir No. 2