| State: | WI |
| Type: | WI |
| Route: | 104 |
| Map Custom: | yes |
| Map Notes: | WIS 104 highlighted in red |
| Length Mi: | 15.4 |
| Direction A: | South |
| Terminus A: | in Brodhead |
| Direction B: | North |
| Terminus B: | in Brooklyn |
| Counties: | Green, Rock, Dane |
| Previous Type: | WI |
| Previous Route: | 103 |
| Next Type: | WI |
| Next Route: | 105 |
State Trunk Highway 104 (often called Highway 104, STH-104 or WIS 104) is a state highway in the US state of Wisconsin. It runs in a north–south direction in south central Wisconsin from Brodhead to Brooklyn. It was first designated in 1919–1920 before being rerouted in 1923–1926 and extended in 1999.
WIS 104 is a two-lane undivided highway for its entire length, travelling straight north-south along the Green County line from WIS 11 in Brodhead to WIS 92 in Brooklyn. Starting at Brodhead as a continuation of County Trunk Highway T (CTH-T), WIS 104 begins to travel northward from WIS 11 and CTH-T. Then, after 6.2miles, it runs concurrently with WIS 59. After leaving the concurrency, it then travels under 3.2miles before a short, 0.2miles concurrency with CTH-C after which it travels another 4.5miles before ending at WIS 92 in Brooklyn. The road continues north as CTH-MM.[1]
WIS 104 was first designated in 1919–1920, running along its current route north of Broadhead before turning east then north to WIS 10 in Evansville.[2] [3] In 1923–1926, the highway was rerouted, removing all of its sections not on the current route and adding a short section to connect to WIS 59.[4] [5] Its route then remained unchanged until 1999 when it was extended 8.9miles north to its present northern terminus at WIS 92 in Brooklyn.[6] [7]
The entire highway is along the Green county line.