Navigation Facilities Supervisor David Carpenter is covered in barnacles from annual maintenance activities at the Hiram M. Chittenden Locks in Seattle Nov. 13. The Locks two massive filling culverts, nearly 14 feet tall by 8 feet wide and about 800 feet long, are scraped by hand to remove barnacles that could injure juvenile salmon during migration season. It takes U.S. Army Corps of Engineers employee volunteers about four days to complete the scraping. The large lock chamber closes each November for annual maintenance and inspection. (U.S. Army Corps of Engineers photo by Bill Dowell)