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Highway 287 -LRB- MT 287 -RRB- is a state highway in the U.S. state of Montana .. state highway. state highway. Montana. Montana. The highway runs 42.822 mi from MT 41 in Twin Bridges east to U.S. Route 287 -LRB- US 287 -RRB- in Ennis .. Twin Bridges. Twin Bridges, Montana. Ennis. Ennis, Montana. MT 41. Montana Highway 41. U.S. Route 287. U.S. Route 287 in Montana. MT 287 is the primary east -- west highway of Madison County .. Madison. Madison County, Montana. Madison County. Madison County, Montana. The highway connects the county 's four towns , including Sheridan and the county seat of Virginia City .. Sheridan. Sheridan, Montana. county seat. county seat. Virginia City. Virginia City, Montana. The course of MT 287 follows the ultimate portions of two trails that met in Virginia City , the center of the Alder Gulch gold rush of the mid-1860s and the second territorial capital of Montana .. Montana. Montana. Virginia City. Virginia City, Montana. Alder Gulch. Alder Gulch. gold rush. gold rush. Alder. Alder, Montana. Parts of the highway were improved from rudimentary roads around 1920 from Virginia City to Ennis .. Ennis. Ennis, Montana. Virginia City. Virginia City, Montana. This connection became the first portion of Montana Highway 34 in the early 1930s ; the highway was extended west to Twin Bridges in the late 1930s .. Twin Bridges. Twin Bridges, Montana. Montana. Montana. MT 34 was reconstructed from Twin Bridges through Alder to Virginia City in the late 1930s and early 1940s and between Virginia City and Ennis in the late 1940s to mid-1950s .. Twin Bridges. Twin Bridges, Montana. Ennis. Ennis, Montana. Virginia City. Virginia City, Montana. Alder. Alder, Montana. The MT 287 designation was first applied to a cross-state route from West Yellowstone to Canada in the late 1950s .. West Yellowstone. West Yellowstone, Montana. Canada. Canada. The highway was rerouted to assume MT 34 in the early 1960s and was removed from the cross-state corridor , along which it was mostly replaced by US 287 , in the mid-1960s .. MT 287 extended north of Twin Bridges to Whitehall until the late 1970s , when it achieved its current length .. Twin Bridges. Twin Bridges, Montana. Whitehall. Whitehall, Montana