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

Tanner Spring is located approximately 2.5 miles (4 km) south (downstream) from the SR 6 bridge over the Withlacoochee River. The spring is located along the northeast bank of the river.

Description - Tanner Spring, also known as HAM612981, issues into a 30 ft (9.1 m) diameter spring pool from a circular vent 24 ft (7.3 m) deep located in the center of the pool. Exposed limestone is present along the pool bottom along with a thin layer of algae and sparse aquatic vegetation. The water is brown with poor clarity and a prominent boil is visible above the vent. The spring run has a limestone bottom and flows south 50 ft (15.2 m) into the Withlacoochee River. Sparse amounts of vegetation and algae are present in the spring run. Private land gently slopes 8 ft (2.4 m) above the spring and run water surface. The spring is surrounded by a mixed hardwood and pine forest. Discharge on June 12, 1998 measured 92.5 ft3/s(4).