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Photo tour: Idaho 55 work zone down to one lane with machinery, rock in narrow canyon

Late last week, we drove through the Idaho Highway 55 canyon between Smith’s Ferry and Round Valley. The Idaho Transportation recently started a two-year project to revamp a stretch of the road. Crews will widen the two lanes through the canyon and add shoulders.

The first phase of work includes removal blasting work on the rocky hillside. Crews shut down the road during a period each Monday-Thursday from 10am-2pm.

On the first weekend of the project, long delays of two hours were caused by faulty programming of an automated signal. An ITD spokesperson says human flaggers are now in place over the busy weekend times to better control traffic.

During the winter months, construction will stop and there shouldn’t be any delays.

Work will pick back up in the spring, and continue through late-fall of 2022.

Here are photos of our drive through the canyon northbound from Smith’s Ferry toward Cascade last Thursday.

Don Day - BoiseDev Editor
Don is the founder and publisher of BoiseDev. He is a National Edward R. Murrow Award winner and a Stanford University John S. Knight Fellow. Contact him at [email protected].

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