There are six interstates which cross the continental divide, five east-west routes: 10, 40, 70, 80, and 90, ans one north-south route: 15. Some of the crossings are more spectacular than others.
Here are my rankings:
#6 - Interstate 10. Separ, New Mexico. Is this even a summit? There's a trading post at the exit, but the difference in elevation on either side is virtually imperceptible. Appararently, NMDOT marks the spot, two miles to the west, but this website indicates that it's here: https://clui.org/ludb/site/interstate-10-crossing-continental-divide 32.202638935301025, -108.42381480815185
#5 - Interstate 80. The divide splits in Wyoming, creating a basin, and the interstate passes right through it, resulting in two crossings on I-80. The crossing isn't from east to west or west to east, instead it's east to basin, and then basin to west. It's a little anticlimatic. Elevation 6930 at exit 158, and again just west of exit 206. In between them is the town of Wamsutter.
#4 - Interstate 40. Campbell Pass, elevation 7275. In New Mexico. At least here they have a touirst trap, with souvenir shops and Indian an village. 35°25'18.9"N 108°18'30.2"W
#3 - Interstate 15. Monida Pass, elevation 6870, on the Idaho-Montana state line. Now we're starting to see some passes that actually look like mounain passes. Montana welcomes you with the ever elusive Exit 0.
#2 - Interstate 70. Colorado, inside the Eisenhower Tunnel. This is the highest point on the entire interstate system, 11,158 feet above sea level at the western portal.
#1 - Interstate 90. Lookout Pass, elevation 4725. at the state line between Montana and Idaho, there's a steep climb on both sides, and it's crowned with a ski resort at the top. Even though it's much lower than the Eisenhower Tunnel, this one screams mountain summit. 47.45451106893787, -115.69468762830918
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