MP: 93.09 Location: SR 21 and SR 174, Lincoln Cty 14 miles to the Keller Ferry. The Keller Ferry is the only state highway ferry in eastern Washington and the only state highway ferry crossing over a river MP: 106.63 Location: SR 21 and Coulee Dam Recreation Area Rd, Lincoln Cty We come to the … Continue reading State Route 21, SR 174 to Wilbur Ferry Terminal