Archer #2 Reservoir Report
Nearby: Heble Hughes Junior #1
Last Updated: December 5, 2025
Archer #2 is a privately owned irrigation dam located in Fergus County, Montana, along the TR-North Fork Elk Creek.
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Summary
Built in 1964 by the USDA NRCS, this Earth-type dam stands at 33 feet high and spans 150 feet in length, providing a storage capacity of 65 acre-feet for agricultural water supply. The dam is regulated and inspected by the DNRC, ensuring its safe operation and compliance with state jurisdictional requirements.
With a low hazard potential and a condition assessment of "Not Rated," Archer #2 serves as a crucial water resource for the surrounding area, supporting irrigation activities and contributing to the local agricultural economy. Despite lacking specific data on surface area and drainage, the dam's maximum discharge of 100 cubic feet per second and spillway width of 20 feet indicate its ability to effectively manage water flow and prevent flooding. The dam's location in a remote area near Mosby, Montana, underscores its importance in sustaining water availability for local farmers and landowners.
As a key infrastructure for water management in the region, Archer #2 represents a partnership between private ownership, federal design by the Natural Resources Conservation Service, and state regulatory oversight by the DNRC. With a history of responsible operation and maintenance, this dam plays a vital role in ensuring water security and supporting agricultural productivity in Fergus County. Its strategic placement along TR-North Fork Elk Creek highlights the significance of efficient water resource management in the face of changing climate conditions and increasing demands on water supply.
Year Completed |
1964 |
Dam Length |
150 |
Dam Height |
33 |
River Or Stream |
TR-NORTH FORK ELK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
33 |
Drainage Area |
0.47 |
Nid Storage |
65 |
Hazard Potential |
Low |
Nid Height |
33 |
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.
Archer #2