Hl Creek Reservoir Reservoir Report
Last Updated: December 13, 2025
Hl Creek Reservoir, also known as Sixmile Lake Dam, is a privately owned irrigation reservoir located in Harney, Oregon.
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Summary
The dam, completed in 1943, is primarily used for irrigation purposes and has a storage capacity of 130 acre-feet. It spans 380 feet in length and stands at a height of 10 feet, with a hydraulic height of 9 feet.
Situated in a remote area with no downstream settlement, the reservoir serves as a crucial water source for the Eckhardt, H L, & Spring/Trib Catlow Valley. Despite being state regulated by the Oregon Water Resources Department and subject to regular inspections, the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
The reservoir features a needle outlet gate and has a maximum discharge capacity of 67 cubic feet per second. With a surface area of 21 acres and a drainage area of 7.8 square miles, Hl Creek Reservoir plays a vital role in water resource management and agricultural sustainability in the region.
Year Completed |
1943 |
Dam Length |
380 |
Dam Height |
10 |
River Or Stream |
ECKHARDT, H L, & SPRING/TRIB CATLOW VALLEY |
Primary Dam Type |
Earth |
Surface Area |
21 |
Hydraulic Height |
9 |
Drainage Area |
7.8 |
Nid Storage |
130 |
Structural Height |
10 |
Outlet Gates |
Needle |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Hl Creek Reservoir
Threemile Creek
Home Creek