Indiana Code Title 8. Utilities and Transportation § 8-10-9-3

Sec. 3. (a) There is established in each city to which this chapter applies a waterway management district.

(b) The district includes all territory, including both dry land and water, within a distance of one-half ( 1/2 ) mile on either side of the center line of any waterway within the city in which the district is established, excluding the land and water occupied by any marina owned by a unit of government located in the strip of land in Indiana abutting Lake Michigan and the tributaries of Lake Michigan.

(c) The district boundary is formed by an imaginary line one-half ( 1/2 ) mile distant from the center line of a waterway in all directions.  However, the boundary of the district does not extend beyond the boundaries of the city in which the district is located in those areas where the city boundary is located less than one-half ( 1/2 ) mile from the center line of a waterway.