Beautiful bit of scaling work conducted by a Washington State Department of Transportation worker on a roadside cliff near Diablo Lake. WSDOT is working to stabilize a slope alongside State Route 20 and that includes scaling operations, a technique used to remove loose rocks and boulders from steep slopes or cliff faces to reduce the risk of rockfall.
Once loose rocks and boulders on a slope or cliff face are identified, workers come and remove them manual or mechanical techniques. In this case the man utilized hand tools, heavy duty compressed airbags and ultimately a bit of good old fashion muscle to make this massive rock stack go timber and crash to onto the roadway below:
UPDATE MAY 7: Scaling work continues on a slope above SR 20 near Diablo Lake. Crews use hand tools, air compression (and a little muscle) to send loose rock down the slope.
— WSDOT North (@wsdot_north) May 7, 2026
SR 20 remains closed from MP 130-156. More info in our latest blog update https://t.co/LIFhEa21hR https://t.co/tVIPXIcmxN pic.twitter.com/di2wg2I7AS
“Contractor crews are performing scaling work, rappelling down the slope to carefully examine it for loose rock or debris. They use hand tools and compressed air to dislodge and send potential hazards down the slope. This is a meticulous process that will take several days as they work their way from the top of the slope to bottom.” -WSDOT
Here’s some more scaling handiwork done by the folks at WSDOT from their project along northbound I-5 earlier this year. So very satisfying to watch indeed.
