U.S. Federal Route 51 is a north-south highway in Lee County. It runs along Interstate 39 on it's entire life in the county. U.S. Rt. 51 does not pass through any towns in Lee County. U.S. Rt. 51 is multi-plexed in Lee County. Interstate 39, throughout Lee County.
U.S. Rt. 51 intersects the following highway in Lee County. U.S. Rt. 30, near Scarboro.
SB I-39/U.S. Rt. 51 at the Lee/Ogle County Line. NB I-39/U.S. Rt. 51 north of Steward. A BGS east of Steward. NB I-39/U.S. Rt. 51 at Steward. SB I-39/U.S. Rt. 51 south of Steward. NB I-39/U.S. Rt. 51 north of U.S. Rt. 30. SB I-39/U.S. Rt. 51 near Paw Paw. NB I-39/U.S. Rt. 51 north of Paw Paw. SB I-39/U.S. Rt. 51 south of Paw Paw. NB I-39/U.S. Rt. 51 at the La Salle/Lee County Line.
