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Keystone Wye
An interchange of US 16 and US 16A located in the Black Hills, featuring two unique "glulam" (Glue-laminated) timber bridges. The Keystone Wye is a trumpet-style three-way interchange for the two divided highways, constructed in 1966-67 as part of the project converting US 16 to a four-lane, divided highway from Rapid City, South Dakota to Keystone for visitors to Mount Rushmore National Memorial.
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