Even as crews work to solve engineering quandaries associated with building the Hanford Waste Treatment and Immobilization Plant project in southeast Washington at the Dept. of Energy’s Hanford Nuclear Waste Site, work continues on tearing out the old facilities.
The holiday season provided some rest for Bertha, the tunnel-boring machine roughly three-quarters of the way through its route to bore a new State Route 99 tunnel under downtown Seattle, but that doesn’t mean crews have had it so easy.
The year 2017 shouldn’t have had any major projects slated for the Multnomah County-owned Morrison Bridge in Portland, but the 1958-built bascule bridge spanning the Willamette River will get one much-needed repair to its roadway this year, a completely new lift span deck.
As work moves forward on the Hanford Waste Treatment and Immobilization Plant (WTP) at the Dept. of Energy’s Hanford Nuclear Waste Site in southeastern Washington, crews have started the final stage of testing intended to resolve one of the remaining technical issues on the project.
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.