Johnson Spring, also known as GIL101971 (Hornsby and Ceryak, 1998), has an elongated spring pool that measures 35 ft (11 m) by 70 ft (21 m). The spring vent is located on the south side of the pool. Depth measures 4.0 ft (1.2 m). Limestone is exposed at the vent, and there is an abundance of aquatic vegetation on the spring bottom. The spring water is clear and bluish. Duckweed covers the surface of the pool along its edges. A double spring boil is observed on the spring surface over the vent. The spring run is 13.5 ft (4.1m) wide, 850 ft (259 m) long and 1.5 ft (0.4 m) deep. The run bottom consists of soft sand and mud with abundant algae. It flows southward into the north side of the Santa Fe River. Johnson Spring is surrounded by private property. A private access road leads to the spring from the north. The spring is within forested lowlands along the Santa Fe River. A discharge of 8.25 ft3/s (4) was measured on October 1, 1997.
The spring flows into the Santa Fe River from the south, directly across from the Rum Island boat ramp, approximately 5 miles (8.1 km) west of High Springs. From the intersection of US 27 and Main Street in High Springs, drive NW on US 27/20 approximately 3.3 miles (5.3 km) to the intersection with CR 138. Turn west (left) onto CR 138 and drive about 2.0 miles (3.2 km) to the intersection with Rum Island Road. Turn south (left) at sign for Rum Island and travel approximately 1.5 miles (2.4 km) to the boat ramp.
March 2010 [flickr-photoset:id=72157623755859692,size=s]