Day 10.  Idaho to Utah.  We were on the road after breakfast and didn't stop until we got to Snake River, just outside of Twin Falls.  The I. B. Perrine Bridge is a truss arch bridge carrying US 93's traffic in 4 lanes over the Snake River Canyon. It was originally named the Twin Falls-Jerome Intercounty Bridge and when it opened to traffic in September 1927, it was the highest bridge in the ...