Section 27. When such ordinances or by-laws have been approved, the department, county commissioners or the city or town shall place said draw under the direction of a suitable draw tender, and shall post a copy of such ordinances or by-laws in some conspicuous place near by. Such draw tender shall have full control of the passing of vessels through the draw, shall furnish all facilities for such passing, shall allow no detention, having due regard for the public travel, and shall enforce the ordinances or by-laws aforesaid.