When first posted as such in January 1964, SR 524 started at Jct SR 104 near the Edmonds ferry pier and headed east to Jct US 99 in Lynnwood. In January 1965, I-5 was opened to traffic from Jct SR 522 in Seattle to the south end of Everett. SR 524 was extended east to I-5. Provisions in state law had been made for SR 524 to be extended further east to Jct SR 527 at Thrashers Corner. The provisions stated that existing routes would not be maintained as a state highway, however. Effective April 1, 1992, SR 524 was extended east from I-5 and it was along existing roads. The eastern terminus was set beyond SR 527 at Jct SR 522 in Maltby. Today, SR 524 is 14.68 miles long.
Before 1964, SR 524 from SR 104 to SR 527 had been part of SSH 1W with the provisions noted above.
At the time that SR 524 was extended east from US 99 to I-5, there was only half an interchange with SR 524/196th St SW. A complementary half interchange was built at 44th Ave W and I-5. 44th Ave W from 196th to I-5 was a spur of SR 524. This spur is 0.50 miles long. In the late 1990s, the I-5/SR 524 junction at 196th was expanded into a full interchange. Although the SR 524 Spur is no longer needed to make all turning movements between SR 524 and I-5, the spur is still part of the state highway system.
The toll booth and holding lanes for the Edmond ferry terminal were moved off the pier in the late 1970s to provide more space for vehicles waiting for the ferry. A spur of SR 524 was created using Edmonds streets to allow westbound SR 524 traffic to access the new toll booths. This spur is 0.70 miles long.
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