Replace Fortification Stockade Fencing at the Fort Clatsop Replica

Lewis and Clark National Historic Park » Replace Fortification Stockade Fencing at the Fort Clatsop Replica » Document List

This project will replace the stockade features of the circa 2006/07 Fort Clatsop Replica requiring the entire 40 foot long feature to be removed and rebuilt. This replacement is to correct a documented safety issue that started with the rotted South gates. This led to further inspection which determined that the king posts were rotted and the header and king posts ready to collapse . These need removed ASAP. Rotted fortification pickets, side rails, king posts, gate hinge posts, gates and header will be replaced in-kind.

This feature will be burn treated on the ends and treated as per the new Operations and Maintenace plan with board defense borate treatment to better preserve an increase its lifespan. Shou Sugi Ban 焼杉板 (or Yakisugi) is an ancient Japanese exterior wood preservation technique that preserves wood by charring it with fire. The process involves charring the wood, cooling it, cleaning it, and finishing it with a natural oil. This technique will be used on the buried components and bottom end grain of the gates and pickets.

These fortification features include three hung gates that were lag bolted together in 2007 which caused immediate rot and decay. The King post gate post will be replaced as per original design with tight grain Douglas fir, hand hewn and wooden pegs. These may be placed up to 3 ft. below ground surface. The mortise and tenon work will be of expert joinery prepared by a preservationist and match the era with no more that 1/32 inch tolerance for all joinery.

The two king post identified on the drawing with a "K" are imbedded into the packed gravel substrate 3 feet, and be burned and treated with the approved borate treatment. These post will go directly into the existing holes after the rotted material is removed. The Trimmers "T" on drawing or gate hinge post will sit on the existing pressure treated sill that is existing and remain in place.

All side pickets will be replaced in like kind and picket side rails pegged with wooden pegs and tightly fitted with hand tools and wooden mallets. The total 19 pickets replaced and fitted as originals were with limited to no impact utilizing existing holes.

The two gates on the South side will be replaced - pictured in attachments and the one gate on the North side of the fort is being built now. Minor improvements to the craftsmanship is required to ensure the gates reach their design life and provide an meaningful attraction the visitors to touch and experience. The old gate were produced in hurry by a youth team and one preservation carpenter. Please see fort gate photos.