Miss. Code Ann. § 65-23-319: Miss. Code Ann. § 65-23-319

When the particular bonds issued for any bridge or bridges and the interest thereon shall have been paid, or a sufficient amount shall have been provided for their payment and shall continue to be held for that purpose, the county or counties issuing such bonds shall cease to charge tolls for the use of such bridge or bridges; and thereafter such bridge or bridges shall be free.