Milton-Freewater Lagoon N-3 Reservoir Report
Last Updated: December 14, 2025
Milton-Freewater Lagoon N-3, located in Umatilla, Oregon, is a local government-owned earth dam completed in 1988.
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Summary
This dam serves a variety of purposes, with a primary height of 12 feet and a storage capacity of 161.2 acre-feet. The lagoon covers a surface area of 14.3 acres and is situated on an unnamed tributary of the Walla Walla River.
Despite its low hazard potential, Milton-Freewater Lagoon N-3 is regulated, permitted, inspected, and enforced by the Oregon Water Resources Department. The dam is designed to hold back water and manage the flow in the surrounding area. Its location in S31, T6.00N, R35.00E of WM makes it a crucial part of the local water resource infrastructure.
With a history of regular inspections and a condition assessment that is currently not rated, Milton-Freewater Lagoon N-3 plays a vital role in water management in the region. Enthusiasts of water resources and climate will find this dam an interesting subject for further study and exploration in understanding the intersection of human infrastructure with natural water systems.
Year Completed |
1988 |
Dam Height |
12 |
River Or Stream |
UNNAMED TRIB/WALLA WALLA RIVER |
Primary Dam Type |
Earth |
Surface Area |
14.3 |
Hydraulic Height |
7 |
Drainage Area |
0.02 |
Nid Storage |
161.2 |
Structural Height |
12 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Walla Walla River Near Touchet
|
1040cfs |
Mill Creek At Walla Walla
|
216cfs |
Mill Creek At Five Mile Rd Br Nr Walla Walla
|
634cfs |
Umatilla River Above Meacham Creek
|
196cfs |
Mill Creek Near Walla Walla
|
71cfs |
Meacham Creek At Gibbon
|
315cfs |
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.
Milton-Freewater Lagoon N-3