Trail Spring is a nearly circular pool that measures 35 ft (10.7 m) north to south and 25 ft (7.6 m) east to west. The vent is located on the northeast side of the pool. It is a 6 ft (1.8 m) wide elongated fissure in the exposed limestone. Depth to the vent is 12.9 ft (3.9 m). Limestone is exposed along the pool bottom and along the northeast and southeast sides of the pool. The water in the pool is clear and blue-green in color. About 35% of the pool bottom is covered by aquatic vegetation. A small run 20 ft (6.1 m) long flows southwest from the vent to the Santa Fe River. The run is shallow, approximately 0.5 ft (0.1 m) deep with no aquatic vegetation. The spring is located in Ellie May’s Campground, a private swimming and camping concession. A cement and wood deck is located on the north side of the pool and a cement platform is on the northeast side of the pool. A set of wooden steps lead down to the pool from the northwest. The spring is also known as Pleasant Grove Spring. Discharge on September 16, 1997 measured 9.48 ft3/s.
From the east bank of the Suwannee River at the bridge in Branford, drive east on US 27 approximately 4.1 miles (6.6 km) to junction with U.S. 129. Turn south (right) on U.S. 129 and drive approximately 4 miles (6.4 km), and turn west (right) at sign for Elly Ray’s Campground on graded road about one mile (1.6 km) south of the bridge over the Santa Fe River. Follow the graded road to the campground, turn left and drive to river. The spring is located down by the river.