Update for March 14, 2008
This week Debco Construction began work on the rock fall protection system located approximately ½ mile upriver from Island Bar. In this area, holes are drilled through the silty-sand colluvium and into rock. One and one-eighth inch (1 ⅛ “) diameter reinforced steel bars are then installed and pressure-grouted to provide a mechanical connection between the rock and the nail. Once the grout has cured, a wire mesh is placed over the slope and connected to the nails. The purpose of the mesh is to maintain stability of the new cut slope.
The picture below shows the drilling operation for the rock fall protection system.
Have a great week,
Jane Traffalis
Construction Project Manager
Western Federal Lands Highway Division
Federal Highway Administration
If you would like to provide a comment, click here: salmonriver@mail.wfl.fhwa.dot.gov