Portions of the following information were taken from Florida Geological Survey Bulletin 66.

McBride Slough Spring is located on private land 6 miles northwest of the town of St. Marks, north of the CR 267 (Bloxham Cutoff Road) bridge over McBride Slough.

Description - McBride Slough Spring discharges into a circular pool 50 ft in diameter. The pool has a maximum depth of 7 ft with a sand and limestone bottom. The milky blue spring pool has an abundance of exotic vegetation. The spring flows 100 ft southeast to McBride Slough, contributing a majority of the flow of this slough. McBride Slough flows south to pass under the CR 267 Bridge, continues approximately 1 mile, and enters the Wakulla River from the north. The run is approximately 3 ft deep. The spring is located on private property with an old wooden boardwalk and an openwalled hunter’s shack on the northwest side. It appears to be situated along a karst subsidence corridor that is dotted with sinkholes along its upper reaches.