Title:  Municipal Boundaries

In regards to the GIS mapping of municipal boundary lines:

Highways have a width from the centerline out each direction to a right-of-way line.  Municipalities have legal written descriptions that may follow the centerline, or the right-of-way line.  Municipalities may also have boundary lines that follow the centerline, or either bank of a body of water.  I am not a legal expert on this, so if there are any legal issues with jurisdiction you should find someone else to help you interpret the statutes below etc.

State Statutes

175.40 Arrests; assistance. (4)

A peace officer whose boundary is a highway may enforce any law or ordinance that he or she is otherwise authorized to enforce by arrest or issuance of a citation on the entire width of such a highway and on the entire intersection of such a highway and a highway located in an adjacent jurisdiction. This subsection does not extend an officer's jurisdiction outside the boundaries of this state.

2.03 Jurisdiction of counties on boundary streams.

Whenever 2 counties are separated from each other by a river or a creek, the middle of the main channel of such river or creek shall be the division line between them, unless otherwise provided in the description of the boundaries of such counties. The counties so separated shall have common jurisdiction of all offenses committed on the waters between them, and all writs and process issued in any such county may be executed at any place on the waters of such river or creek opposite the county from which it was issued.

2.04 Jurisdiction of counties on boundary lakes and state boundary waters.

… when 2 or more counties are now or hereafter organized on the shores of any inland water of this state, as defined in s. 29.001 (45), the counties shall have jurisdiction in common of all offenses committed on any part of the inland water; and all offenses committed against this state on any part of the waters may be heard and tried in any of the counties having common jurisdiction over the waters where the offense may be committed in which legal process against the offender is first served and may be alleged and shall be conclusively deemed to have been committed within the county; and all civil process from any of the counties may be executed within and upon the waters that are within the jurisdiction of the county. In the construction of this section all wharves and piers are part of the land with which they are connected.