Interstates on Islands

[triplemultiplex]

I-80 is on numerous islands as it weaves with the various channels of the Platte River in Nebraska.

[JayhawkCO]

I-78 in (on?) Manhattan.

[paulthemapguy]

There's I-270 around the north side of St. Louis, crossing the Chain of Rocks Canal to Chouteau Island before traversing the rest of the Mississippi River.

[ilpt4u]

There's I-270 around the north side of St. Louis, crossing the Chain of Rocks Canal to Chouteau Island before traversing the rest of the Mississippi River.

Was mentioned up-thread by SkyPesos:

I-270 Choteau Island (between Mississippi River and Chain of Rocks Canal)