Prairie City Lagoon (Cell 3) Reservoir Report
Last Updated: December 13, 2025
Prairie City Lagoon (Cell 3) in Grant, Oregon, is a vital water resource managed by the local government for irrigation purposes.
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Summary
Completed in 1981, this earth dam stands at a height of 18 feet with a hydraulic height of 15 feet, providing a storage capacity of 54 acre-feet. The lagoon covers a surface area of 7.52 acres and is regulated by the Oregon Water Resources Department, ensuring state jurisdiction, permitting, inspection, and enforcement for its operation.
Situated in a remote location with "no downstream impacts" in a municipal waste stream, Prairie City Lagoon serves as a key infrastructure for water management in the region. Despite its low hazard potential, the lagoon undergoes regular inspections every six years to monitor its condition and ensure safety measures are in place. The dam features a slide gate as an outlet for water discharge and has an uncontrolled spillway type, with a moderate risk assessment of level 3.
With its strategic importance for irrigation, Prairie City Lagoon exemplifies sustainable water resource management in Oregon. The lagoon's moderate risk level presents an opportunity for ongoing monitoring and risk management measures to safeguard its functionality and ensure continued water supply for agricultural purposes in the region. Its remote location and low hazard potential make Prairie City Lagoon a valuable asset for water resource and climate enthusiasts interested in sustainable infrastructure development and management.
Year Completed |
1981 |
Dam Length |
2250 |
Dam Height |
18 |
River Or Stream |
MUNICIPAL WASTE |
Primary Dam Type |
Earth |
Surface Area |
7.52 |
Hydraulic Height |
15 |
Nid Storage |
54 |
Structural Height |
18 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
18 |
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 |
|---|---|---|
Depot Park
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Grant County RV Park
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Magone Lake Campground
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Magone Lake Rec Area
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Magone Lake Group Campground
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McNaughton Spring Campground
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Prairie City Lagoon (Cell 3)