Hog Lake Dam Reservoir Report

Last Updated: December 13, 2025

Hog Lake Dam, also known as Deep Lake Dam, is a state-owned structure located in Sprague, Washington, along Fishtrap Creek.


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Summary

Built in 1957 by the Washington State Fish & Wildlife, this earth dam stands at a hydraulic height of 22.4 feet and serves primarily for recreational purposes. With a storage capacity of 540 acre-feet, the dam covers a surface area of 40 acres and drains a watershed of 48 square miles.

The dam's condition assessment in 2015 rated it as 'fair' with a high hazard potential. While it is state-regulated and subjected to inspections every five years, its emergency action plan was last revised in 1994. Despite its age, Hog Lake Dam continues to provide essential recreational opportunities to the local community. The dam's association with the Seattle District of the US Army Corps of Engineers ensures ongoing monitoring and management to mitigate any potential risks associated with its operation.

Hog Lake Dam's presence not only offers recreational benefits but also highlights the importance of maintaining and managing water resources in an efficient and safe manner. As a significant component of the water infrastructure in Spokane County, this dam plays a crucial role in flood control, water supply management, and wildlife habitat preservation. Its strategic location and design demonstrate the collaborative efforts between state agencies and local communities to ensure the sustainable utilization of natural resources amidst changing climate conditions.

Year Completed

1957

River Or Stream

Fishtrap Creek

Primary Dam Type

Earth

Surface Area

40

Hydraulic Height

22.4

Drainage Area

48

Nid Storage

540

Structural Height

21.8

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

22
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.