Willow Creek Bor Mt - Dike 2 Reservoir Report
Last Updated: December 5, 2025
Located in Lewis and Clark County, Montana, Willow Creek Bor Mt - Dike 2 is a federal-owned irrigation dam completed in 1941 by the Bureau of Reclamation.
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Summary
With a primary purpose of providing irrigation, this Earth dam stands at a height of 4 feet and a length of 60 feet, holding a maximum storage capacity of 39,800 acre-feet. The dam is situated on the Willow Creek, managed by the Walla Walla District of the U.S. Army Corps of Engineers, and falls under the jurisdiction of the DOI BR.
Despite its critical role in irrigation, Willow Creek Bor Mt - Dike 2 poses a high hazard potential due to its condition assessment being listed as "Not Available." The dam has not undergone recent inspections, with the last one conducted in June 2020. It is essential to prioritize safety measures and risk assessment for this structure to prevent any potential hazards and ensure the efficient operation of the irrigation system it supports. As a significant water resource in the area, the dam's maintenance and upkeep are crucial for sustaining agricultural activities and preserving the local ecosystem.
Year Completed |
1941 |
Dam Length |
60 |
Dam Height |
4 |
River Or Stream |
WILLOW CREEK |
Primary Dam Type |
Earth |
Nid Storage |
39800 |
Structural Height |
4 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
4 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Willow Creek FAS
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Nilan Reservoir FAS
|
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Pishkun Reservoir FAS
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Willow Creek Bor Mt - Dike 2