WIS 26 begins in downtown Janesville,
Rock County at
U.S. Highway 51 (US 51, North Parker Drive), and follows East Centerway Street, to turn northeast on Milton Ave. WIS 26 crosses
US 14 and
Interstate 39/
Interstate 90 (I-39/I-90) on the northeast side of the city. WIS 26 is a divided highway with a few freeway bypass sections from Janesville to
WIS 60 for about . WIS 26 goes north of the I-39/I-90 before bypassing
Milton to the east.
WIS 59 crosses WIS 26 in Milton. WIS 26 crosses over to
Jefferson County about north of Milton. The highway turns northeast at the county line and approaches
Fort Atkinson, but turns northwestward prior to entering the city, and bypasses it to the west with four exits to serve Fort Atkinson. Direct access is provided to
WIS 106 and
US 12.
WIS 89 crosses the route, but no direct access is provided. WIS 26 then continues north for to
Jefferson, where WIS 26 bypasses the city to the west. It has three exits serving Jefferson including one at
US 18. The highway passes through
Johnson Creek at the interchange with
I-94. About north of I-94, WIS 26 bypasses
Watertown to the west as the highway crosses into
Dodge County. The bypass has three exits serving Watertown including at
WIS 19 and
WIS 16. On the Dodge County side of Watertown, WIS 26 and WIS 16
run concurrently for to near
Clyman where WIS 16 exits at
WIS 60. WIS 26 goes into
Juneau then crosses
WIS 33 north of Juneau. After , WIS 26 crosses
US 151 and passes through Waupun. WIS 26 joins US 151 and crosses into
Fond du Lac County at its junction with
WIS 49 in Waupun. WIS 26 joins US 151 for then turns north off the US Highway. After , the highway crosses
WIS 23 in
Rosendale. The highway then angles northeastward over the remaining before entering
Winnebago County. into the county the highway terminates at its interchange with
I-41/
US 41 on the far southwest side of
Oshkosh, about south of the
Wittman Regional Airport, site of
EAA AirVenture Oshkosh. ==History==