What are the highest and lowest elevations on the Interstate system?
I-70 in CO near the west portals of of the Eisenhower Memorial Tunnel (MM 213-215) under the Continental Divide east of Dillon is 11,192 feet above sea level. (Map: 39.68,-105.93 ; see also http://www.dot.state.co.us/eisenhower/ and http://www.mesalek.com/colo/i70.html ) The second-highest is also on I-70 in CO at Vail Pass (Exit 190) which reaches an elevation of 10,666 feet above sea level. (Map: 39.53,-106.22 ; see also http://www.mesalek.com/colo/i70.html ) The third-highest, the highest outside CO, is I-80 in WY just south of the WY 210 interchange (Exit 323) near Sherman Hill, which reaches an elevation of 8,640 feet above sea level. (Map: 41.24,-105.44 ; see also http://www.roadfan.com/eastwym.html , http://www.rockymountainroads.com/wyoming/i-080.html ) The lowest point above ground is likely I-8 in CA south of Seeley at the New River (west of Exit 107) which is 52 feet below sea level. (Map: 32.775,-115.695 ; see also http://www.westcoastroads.com/california/i-008b_ca.html ) T
