College Hill Reservoir Reservoir Report
Last Updated: December 15, 2025
College Hill Reservoir, located in Hoquiam, Washington, is a historic water supply reservoir completed in 1899.
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Summary
Managed by the Washington Department of Ecology, this reservoir serves as a crucial offstream source from the Little Hoquiam River for the local community. With a storage capacity of 25 acre-feet and a surface area of 1.46 acres, the reservoir plays a vital role in ensuring water availability for the region.
Despite its age, College Hill Reservoir is facing challenges in terms of its condition assessment, as it has been rated as poor with a high hazard potential. The last inspection in 2018 highlighted the need for improvement and regular maintenance to ensure the safety and reliability of the structure. Additionally, the reservoir lacks certain key features such as a spillway and outlet gates, which are essential for managing water levels and ensuring proper functioning.
As a significant water resource in Grays Harbor County, College Hill Reservoir is closely monitored and regulated by state authorities. Its strategic location and historical importance make it a valuable asset for water supply purposes in the region. However, efforts must be made to address the current condition assessment and implement necessary risk management measures to safeguard the reservoir's long-term functionality and resilience in the face of changing climate conditions.
Year Completed |
1899 |
Dam Length |
1000 |
River Or Stream |
Little Hoquiam R. - offstream |
Primary Dam Type |
Other |
Surface Area |
1.46 |
Hydraulic Height |
31 |
Drainage Area |
0.01 |
Nid Storage |
25 |
Structural Height |
25 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wynoochee River Above Black Creek Nr Montesano
|
3910cfs |
Humptulips River Below Hwy 101 Nr Humptulips
|
2990cfs |
Satsop River Near Satsop
|
4530cfs |
Wynoochee River Above Save Creek Near Aberdeen
|
2710cfs |
Willapa River Near Willapa
|
1500cfs |
Chehalis River At Porter
|
23700cfs |
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.
College Hill Reservoir
28th Street 702, Hoquiam