The Boise Connector appeared on planning maps since the 1960s. The freeway opened east from Interstate 80N in December 1968.1 It was approved as Interstate 180 by the American Association of State Highway Officials (AASHO) on June 30, 1970. Idaho Official Maps and various state maps printed in the 1970s showed I-180 as Interstate 180N in the 1970s, referencing Interstate 80N, the designation of I-84 prior to 1980. The American Association of State Highway and Transportation Officials (AASHTO) approved the renumbering of I-180 to Interstate 184 on October 13, 1979. The conversion of I-80N to I-84 was completed by July 1980. During this time period, Interstate 184 in Boise was also briefly signed as Business Loop I-84. Running along side U.S. 20 and U.S. 26 for a portion of its length, the business route was ultimately eliminated to reduce duplicative designations.
The viaduct system along the Boise Connector east from U.S. 20/26 (Chinden Boulevard) and the Boise River to Downtown was completed in August 1992. A $86 million project redesigned the interchange, “The Flying Wye” at the western end of I-184 between February 1999 and September 2004. Construction replaced a three-wye interchange with left side ramps with a multi level exchange. A three lane flyover was built from I-84 east to I-184 and separate ramps were added to and from Franklin Street to remove weaving traffic.1,2