Indiana State Road 45

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State Road 45 is a state route from Bean Blossom, Indiana to Rockport, Indiana. From Bean Blossom and through Brown County, State Road 45 is a narrow, shoulderless two-lane road that passes between the Morgan-Monroe State Forest and the Yellowwood State Forest. It is heavily wooded and follows the natural terrain, which gives the road tight curves and steep hills. As the road passes into Monroe County, the woods disappear and farms and homes begin to line the road. The road remains hilly and curvy until it reaches Bloomington, where it bypasses the city multiplexed with State Road 46 and then State Road 37. West of Bloomington, shoulders appear on State Road 45 and its two lanes become wider. The road meanders with the rolling terrain until it meets and multiplexes State Road 58, after which it is straight and flat until its terminus at US 231.

Until the late 1990s, a section also existed south of Rockport that acted as a connector road to US 231 (now State Road 161) and Owensboro, Kentucky. The southern section was decommissioned about the same time that US 231 was rerouted onto the William H. Natcher Bridge. That former section of US 231 was renamed as State Road 161 with the short Kentucky section given the number 2155.