The McNary downstream gate that was placed in service in 1954 and consists of a two-leaf arched miter gate that measures 106 feet tall by 86 feet wide and each gate leaf weighs approximately 400-tons. The existing gudgeon anchors have exceeded the recommended fatigue life and are programmed for full replacement in a 2024 extended navigational lock outage. This work included the replacement of all four imbedded gudgeon anchors and mechanical linkages to fit up to the existing gate. New post tensioned anchor rods will be installed by drilling or coring to provide aligned holes with backer plates and transition plates that engage the concrete monolith to support the weight of the operating miter leaf gates. The post tensioned rods will be connected by a new five-point gudgeon pin system and mechanical linkages. The components for this project are drilled/cored aligned holes, post tensioning rods, mechanical linkages, work within tight scheduled outages, and inclement winter weather conditions. Primary Subcontractor: Knight Construction.