When SR 207 was first posted as such in January 1964, SR 207 started at Jct US 2 at Coles Corner and headed north to Jct SR 209 and Lake Wenatchee State Park, then NW along the north side of Lake Wenatchee to Telma. The State Park to Telma section of SR 207 and all of SR 209 were dropped from the state highway system effective April 1, 1992. The portion of SR 207 that remains thus is 4.38 miles long.
Before 1964, SR 207 from Coles Corner to Jct SR 209 was part of SSH 15C and the remainder was SSH 15D.
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