Section 2.06.  FISHING OR LOITERING ON BRIDGES.  Any person found guilty of fishing from or loitering upon any bridge located on a public highway crossing the Milwaukee River, shall  be subject to a forfeiture of not less than Ten ($10.00) Dollars nor more than Five Hundred ($500.00) Dollars, and the costs of the action; and in default of payment thereof, shall be subject to imprisonment in the County Jail or the House of Correction of Milwaukee County until such forfeiture and costs, together with any subsequent costs, have been paid, but in any event not to exceed thirty (30) days.