Prairie City Lagoon (Cell 2) Reservoir Report
Last Updated: December 13, 2025
Prairie City Lagoon (Cell 2) is a vital water resource located in Grant, Oregon, primarily used for irrigation purposes.
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Summary
This earth dam structure, completed in 1981, stands at a height of 16 feet and has a hydraulic height of 12 feet, with a capacity to hold 56 acre-feet of water. The lagoon covers an area of 8.04 acres and serves as a crucial water source for agricultural activities in the region.
Managed by the local government and regulated by the Oregon Water Resources Department, Prairie City Lagoon (Cell 2) has a low hazard potential and a moderate risk assessment rating. The structure is equipped with a slide gate outlet and an uncontrolled spillway type. While the dam has not been rated for its condition, it undergoes inspections every six years to ensure its structural integrity and safety. The site is situated in a remote area, with no downstream settlement, emphasizing its significance in providing water for irrigation purposes in the region.
With its strategic location and importance in supporting irrigation activities, Prairie City Lagoon (Cell 2) serves as a key infrastructure for water management in the area. The dam's construction and design reflect a commitment to sustainable water resource utilization, ensuring the efficient distribution of water for agricultural needs. As a regulated facility with state permitting, inspection, and enforcement mechanisms in place, the lagoon plays a crucial role in maintaining water security and resource sustainability in the region.
Year Completed |
1981 |
Dam Length |
2250 |
Dam Height |
16 |
River Or Stream |
MUNICIPAL WASTE |
Primary Dam Type |
Earth |
Surface Area |
8.04 |
Hydraulic Height |
12 |
Nid Storage |
56 |
Structural Height |
16 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
16 |
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 2)