Wisconsin Highway 57

State Trunk Highway 57
57th Field Artillery Brigade Memorial Highway
WIS 57; mainline in red, business route in blue
Route information
Maintained by WisDOT
Length	191.82 mi[1] (308.70 km)
Existed	1918 (1918)[2]–present
Tourist routes	Lake Michigan Circle Tour
Major junctions
South end	WIS 59 in Milwaukee
Major intersections	I-94 in Milwaukee US 18 in Milwaukee I-43 / WIS 190 in Milwaukee I-43 / WIS 32 / WIS 167 in Mequon I-43 in Saukville US 151 in Chilton US 10 in Forest Junction US 141 / WIS 29 in Green Bay I-43 in Green Bay WIS 42 around Sturgeon Bay
North end	WIS 42 in Sister Bay
Location
Country	United States
State	Wisconsin
Counties	Milwaukee, Ozaukee, Sheboygan, Manitowoc, Calumet, Brown, Kewaunee, Door
Highway system
Wisconsin State Trunk Highway System Interstate US State Scenic Rustic
← WIS 56 → WIS 58

Wisconsin Highway 57 (often called Highway 57, STH-57 or WIS 57) is a 191.82-mile-long (308.70 km) state highway in Wisconsin, United States. It runs from its southern terminus at WIS 59 in Milwaukee to its northern terminus at WIS 42 in Sister Bay. Much of WIS 57 parallels Interstate 43 (I-43) and WIS 42, particularly from Saukville to its northern terminus in Sister Bay. The highway runs concurrently with I-43 for 12 miles (19 km) in Ozaukee County. Like most Wisconsin state highways, WIS 57 is maintained by the Wisconsin Department of Transportation (WisDOT).

WIS 57 serves as a major highway in eastern Wisconsin, and it was originally designed to connect the major cities of Milwaukee and Green Bay as well as several other large cities along its corridor. The state of Wisconsin proposed that the WIS 57 route become an Interstate Highway corridor when the Interstate Highway System was planned in the 1950s; the state's plan was rejected in favor of the current routing of I-43, though it remains a popular and marked alternate route for both I-43 and I-41 to the west. WIS 57 is also a major route to the tourist area of Door County; it is one of only two state highways to serve the county with WIS 42.^[3]