(a) The county court shall have a general superintending control of bridges, turnpikes, and causeways mentioned in this subchapter and the rates or tolls to be charged.
(b) The county court shall compel the bridges, turnpikes, and causeways to be kept in good repair at all times.
(c) The county court is required to fix the rate of tolls for crossing any bridge, turnpike, or causeway which may be built under the provision of this subchapter, the rates to be based on a reasonable return on the amount invested, having regard for reasonable operating expenses and reasonable depreciation.
(d) If, after granting the franchise or privilege and the rate of tolls fixed, it shall be made to appear that the rates fixed are inadequate to yield a fair return upon the investment or that the rates yield more than a fair return upon the investment, the county court shall have the right to revise the tolls as justice may require.