O Lane #1 Reservoir Report
Nearby: Hughes Junior #1 Heble
Last Updated: December 5, 2025
O Lane #1 is a privately owned earth dam located in Fergus County, Montana, along the TR-DIFFICULTY CREEK.
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Summary
Built in 1975, this dam stands at 20 feet high and has a storage capacity of 151 acre-feet, primarily serving the purposes of fire protection, stock watering, and small fish pond management. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC), ensuring its structural integrity and compliance with state regulations.
Despite its low hazard potential, O Lane #1 has not been officially rated for its condition assessment. It is situated in a remote area near the city of COMANCHE, surrounded by a rural landscape. The dam's emergency action plan status, risk assessment, and management measures are currently unknown, highlighting the need for further evaluation and preparation in case of any unforeseen events. Climate change and water resource enthusiasts may find interest in exploring the potential implications of such infrastructure in the face of changing environmental conditions.
As part of the Omaha District under the US Army Corps of Engineers, O Lane #1 serves as a critical component of local water management infrastructure. With a focus on maintaining water supply for various purposes, this dam plays a vital role in sustaining the surrounding ecosystem and supporting agricultural activities in the region. The lack of recent inspection data and assessment updates underscore the importance of ongoing monitoring and maintenance to ensure the long-term functionality and safety of O Lane #1 for both current and future generations.
Year Completed |
1975 |
Dam Length |
150 |
Dam Height |
20 |
River Or Stream |
TR-DIFFICULTY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
151 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
O Lane #1