Ind. Code § 8-16-5-1

Sec. 1. Any county or municipality bordering on a stream which forms the boundary line between Indiana and any adjoining state, through its county executive may build and maintain a bridge across the river or stream, in cooperation with any contiguous governmental unit of the adjoining state. The contiguous unit must join in building and maintaining the bridge, and pay one-half (1/2) of the expense.