Should the tolls and revenues procured for the use of the bridge be insufficient to pay the cost of maintaining, repairing and operating the bridge and the interest and principal upon bonded indebtedness as it accrues, the city council may each year levy and collect taxes upon all property, real and personal, situated within the boundaries of the municipality and which is by law taxable for state and other purposes, sufficient to provide for such deficit, subject, however, to charter provisions and the provisions of the Oregon Constitution with respect to debt limitations.
Oregon Legal Code