To see a map of the whole trail, check out Lake Wobegon Trail.
Interstate 94 (I-94) is the northernmost east–west Interstate Highway connecting the Great Lakes and Intermountain regions of the United States. I-94's western terminus is in Billings, Montana at a junction with Interstate 90; its eastern terminus is the U.S. side of the Blue Water Bridge in Port Huron, Michigan, at the Sarnia, Ontario, Canada border, where together with Interstate 69 it meets Highway 402. Given this fact, I-94 is notable for being the only east–west interstate highway to form a direct connection into Canada connecting points from Seattle via I-90 to Toronto via Ontario Highway 402.
Lengthwise, I-94 is the eighth longest Interstate highway and is longer than all major north-south interstate highways except Interstates 75 and 95. In other words, Interstate 94 is longer than Interstates 5, 15, 25, 35, 45, 55, 65, and 85.
I-94 is notable also for crossing I-90 several times: at its western terminus; near Madison, WI; in Chicago, IL; and in Lake Station, IN.
While you are hunting up this cache you can watch the cars go
past you on 
!!!!!!!!
So, head on out to find this cache.