| State Trunk Highway 78 | ||||
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| Route information | ||||
| Maintained by WisDOT | ||||
| Length: | 92.83 mi[1] (149.40 km) | |||
| Major junctions | ||||
| South end: | IL-78 near Gratiot | |||
| US-18/US-151 in Mount Horeb US-14 in Mazomanie US-12 in Sauk City |
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| North end: | I-39/I-90/I-94 near Portage | |||
| Highway system | ||||
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Wisconsin highways
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State Trunk Highway 78 (often called Highway 78, STH 78 or WIS 78) is a state highway in the U.S. state of Wisconsin. It runs north–south in south central Wisconsin from Portage to the Illinois border near Gratiot.
Historical note: In the 1920's, Highway 78 was originally located on the Door County Peninsula on what is now Highway 57.