According to Tony Goodwin:

"Just a heads up that Rt. 73 through Cascade Pass will be closed for construction from May 17 through 27. If they finish earlier, it will reopen earlier. The detour will be via Wilmington. As far as I know, the Cascade and southern Pitchoff trailheads will remain accessible. The northern (eastern) Pitchoff trailhead will be closed. Don't know about access to the Pitchoff cliffs at the lower end of the Lower Cascade Lake."

The construction project will (they hope) finally fix "Twin Bridges (now actually two culverts) so that it doesn't wash out again as it did in 1995, 1996, and to a lesser extent more recently.