Projects

The Desimone-Briscoe School Levee along the Green River in Tukwila, Washington, required significant repairs after a flood had damaged portions of the existing levee toe and slope. US Army Corps of Engineers (USACE) Seattle District awarded Bristol this rehabilitation project as a task order under the Multiple Award Task Order Contract (MATOC) for Design Build and Horizontal Construction to repair approximately 780 feet of levee toe and slope of the approximately 11,600-foot-long Desimone-Briscoe levee. 

The Muckleshoot Indians rely on the Green River for fishing. Any construction along this corridor must adhere to strict environmental requirements to protect wildlife and habitat. Additionally, the general public relies on the integrity of the levee to protect against flooding, prevent damage to adjacent property, and prevent disruption of civil infrastructure. This project included clearing and grubbing along the riverbank as well as demolition of a 12-foot asphalt trail and an asphalt parking area. 

The levee repairs included riverward side slope work with a layback of the slope to 2H:1V, a 12-foot crown, rock armor with a launchable toe, and a mid-slope bench. Bristol matched the levee top elevation to the top of the concrete cap beam and provided two parking spaces and access to the tribal fishing trail for tribal members throughout construction in order to allow maintained fishing access. In order to provide erosion control and bank stabilization in heavy flood events, significant rock work was completed via installing class 4 riprap. Bristol placed topsoil to stabilize the bank, followed by a layer of jute mat, and completed the project by hydroseeding the entire levee area.