The navigable head of the St. John's proved to be near Fort Christmas, where the highway crosses miles of wet prairie and cypress swamp between Orlando and Indian River City.

事实证明，圣约翰河的通航起点靠近圣诞堡，公路穿过奥兰多和印第安河城之间数英里的潮湿草原和柏树沼泽。