Pinto Reservoir Report

Last Updated: December 13, 2025

Pinto, also known as Long Lake Dam, is a federal-owned structure located in Grant, Washington.


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Summary

Constructed in 1948 by the Bureau of Reclamation, Pinto serves multiple purposes including flood risk reduction, irrigation, and recreation. This earth dam stands at a height of 111 feet with a hydraulic height of 107 feet, offering a maximum storage capacity of 76,500 acre-feet and a normal storage of 64,200 acre-feet.

Situated on Crab Creek-offstream, Pinto plays a crucial role in managing water resources in the region, with a drainage area of 186 square miles and a maximum discharge capacity of 15,800 cubic feet per second. Despite being classified as having a high hazard potential, the condition assessment for Pinto is currently not available. Emergency Action Plans (EAP) have been prepared, last revised in September 2020, to ensure proper protocols are in place in case of any unforeseen events.

With its strategic location and significant impact on the surrounding environment, Pinto remains a vital infrastructure for water management and flood control in Washington state. As climate change continues to pose challenges to water resources, structures like Pinto will play a crucial role in safeguarding communities and ecosystems against potential risks and ensuring sustainable water management practices for the future.

Year Completed

1948

Dam Length

1900

Dam Height

111

River Or Stream

CRAB CREEK-OFFSTREAM

Primary Dam Type

Earth

Surface Area

1010

Hydraulic Height

107

Drainage Area

186

Nid Storage

76500

Structural Height

130

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

130
       
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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.