USH 51 runs through the southwestern parts of the Town of Boulder Junction, running northwest towards Manitowish Waters and south towards Arbor Vitae, Minocqua and Woodruff.
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CTH H also serves the town, providing a link from CTH K to a junction with USH 51 and Lac du Flambeau.
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CTH M runs north-south from USH 51 through the unincorporated community of Boulder Junction - where it meets with CTH K - and provides the main means of accessing the community.
Interstate 39 and U.S. Route 51 provide access to the lake, as do several county highways.
The western section runs west from Sayner serving Northern Highland-American Legion State Forest campgrounds and recreation areas at Crystal Lake, Plum Lake, and Firefly Lake before meeting CTH M and eventually USH 51.
CTH W is the main route through the town, it runs east to Presque Isle and a connection with CTH B, and south to Manitowish Waters and a connection to USH 51.
U.S. Route 66 | U.S. Route 1 | U.S. Route 6 | U.S. Route 101 | Route 66 | U.S. Route 30 | New Jersey Route 4 | European route E65 | U.S. Route 40 | California State Route 1 | U.S. Route 1 in Maine | Pennsylvania Route 309 | European route E18 | U.S. Route 23 | European route E4 | U.S. Route 9 in New York | U.S. Route 11 | Pennsylvania Route 82 | European route E70 | U.S. Route 90 | U.S. Route 75 | U.S. Route 61 | U.S. Route 60 | Pennsylvania Route 73 | New York State Route 32 | European route E55 | U.S. Route 80 | U.S. Route 71 | U.S. Route 51 | U.S. Route 22 |
SBI Route 150 originally ran from the U.S. 51/60/62 bridges south of Cairo north to Hamel (located northeast of Saint Louis, Missouri) on what is now Illinois Route 3, the portion of Illinois 150 from Chester to Steeleville, and Illinois Route 4.