P.E.C. Headworks, located in Grant, Washington, is a private structure designed by Harza for the primary purpose of irrigation. Completed in 1990, this concrete dam stands at a height of 90 feet and has a hydraulic height of 76 feet. With a drainage area of 3600 square miles, P.E.C. Headworks plays a vital role in managing water resources in the region for irrigation, hydroelectric power generation, and recreation.

Managed by the Federal Energy Regulatory Commission (FERC), P.E.C. Headworks has a significant hazard potential and a high risk assessment rating. Although the condition assessment is not available, regular inspections are conducted to ensure the safety and integrity of the structure. The Emergency Action Plan (EAP) for the headworks was last revised in December 2020, indicating preparedness for any potential emergencies.

As a key component in the water resource infrastructure of Washington, P.E.C. Headworks serves as a crucial point for water management and distribution in the region. With its strategic location and design features, the dam plays a vital role in supporting various water-related activities while maintaining safety and regulatory compliance under the oversight of FERC.