Any tugboat towing for hire in any of the waters of this state is a common carrier for the business of towing vessels. No master or owner of any such tug shall refuse to tow any vessel of the class usually towed by such a tug, or shall discriminate either in the charges for towing or in time; but they shall tow all such vessels in the order in which they may be announced ready; provided, that towing in or out of a bar harbor may take precedence over towing inside of such harbor.
ORS 783.580