Grohs Reservoir Reservoir Report
Nearby: Antelope Dam Kilgore Reservoir
Last Updated: December 5, 2025
Located in Klamath, Oregon, Grohs Reservoir is a private-owned water storage facility primarily used for irrigation purposes.
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Summary
The reservoir, completed in 1959, spans an impressive length of 2250 feet, with a dam height of 14 feet and a hydraulic height of 11 feet. With a maximum storage capacity of 882 acre-feet and a surface area of 99 acres, Grohs Reservoir plays a crucial role in supporting agricultural activities in the region by providing a reliable water source from Rock Creek.
Despite its low hazard potential and the absence of a spillway, Grohs Reservoir is subject to state regulation, inspection, and enforcement by the Oregon Water Resources Department. The reservoir's outlet gates are equipped with a slide (sluice gate) for water release, and it is situated within close proximity to Bonanza, Oregon. With a drainage area of 10.2 square miles and a maximum discharge of 241 cubic feet per second, Grohs Reservoir serves as a vital component of the local water resource infrastructure, contributing to the sustainable management of water in the area.
In the event of an emergency, the reservoir's Emergency Action Plan (EAP) status remains unreported, and risk assessment and management measures are yet to be detailed. Despite these gaps, Grohs Reservoir continues to fulfill its role in supporting irrigation activities and maintaining water security in the region. As a significant water resource infrastructure in Klamath County, Oregon, the reservoir stands as a testament to the importance of efficient water management practices in the face of evolving climate challenges.
Year Completed |
1959 |
Dam Length |
2250 |
Dam Height |
14 |
River Or Stream |
ROCK CREEK |
Primary Dam Type |
Earth |
Surface Area |
99 |
Hydraulic Height |
11 |
Drainage Area |
10.2 |
Nid Storage |
882 |
Structural Height |
15.5 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pit R Nr Canby Ca
|
56cfs |
Link River At Klamath Falls
|
928cfs |
North Canal At Highway 97
|
104cfs |
Klamath Straits Drain Near Worden
|
1cfs |
Ady Canal At Highway 97
|
39cfs |
Klamath River At Keno
|
698cfs |
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 |
|---|---|---|
Rock Creek Camp
|
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Basin Camp
|
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Upper Midway Camp
|
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Wildhorse Camp
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Grohs Reservoir
Wilcox Spring To Clear Lake National Wildlife Refuge Boundary