The Armin F. Koernig (AFK) Hatchery Dam provides all of the water supply to the AFK Hatchery. In 2008, NGE performed a periodic safety inspection of the original dam which was constructed during the 1930s and expanded in the 1970s. During the inspection it was determined that the dam had deteriorated significantly and was in need of repair or replacement. In 2009 NGE-TFT was contracted to perform a feasibility study for the repair or replacement of the dam. As a result of that study, the decision was made to replace the dam and 16-mile long above ground pipeline that provides the hatchery water supply. It was also decided to raise the normal reservoir level by approximately 5 feet. Design of the new dam began in 2010 and construction was completed in 2012. The new dam consists of a 23 foot tall posttensioned concrete dam in the main stream channel with two sheetpile core earthen berms. The new dam had to be constructed without disrupting the water supply to the hatchery. Other project constraints include the remote location in Price William Sound (air and se access only) and frequent severe weather. NGE-TFT provided all of the design services including geotechnical, hydrologic/hydraulic, and structural as well as construction monitoring and materials testing.