know your springshed
Poe Springs County Park is a great place to spend the day with your family or to just get away from the bustle of life. Relax and soak in the peace of the floodplain forest as you stroll down the long boardwalk to the spring boil. There is plenty of space to find some sun or shade along the river or by the spring itself. Kids and adults alike love to play on the steps leading down to the spring and explore the shallow spring run as the cool water escapes to the Santa Fe River. You too can escape as you float down the river all the way to the Lodge and then follow the foot path along Watermelon Spring to make your way pack to the main spring. The Lodge, with it’s gorgeous river views is a great place to host a meeting or event. I wonder just how many people have said, “I do” while soaking in the view.
Springsheds for the Santa Fe River were mapped using detailed groundwater levels and a report describing that work can be found here.
A map of the Santa Fe River springshed for May 2008 is shown below. In this springshed delineation, the springs are grouped by location. Many of the springs are close together and individual springsheds overlapped and were not readily distinguishable. The springshed for Poe Springs includes much of the karst limestone plain from High Springs south to SR 26 and I-75 near Gainesville. A presentation with slightly different springshed delineation for the Santa Fe River basin springs can be found here.
Karst processes are important in the development of springs and other features of the Santa Fe River basin. Karst can be defined as an irregular limestone region with sinkholes, underground streams, and caverns. All of Florida is underlain by limestone and is susceptible to formation of karst features. The Santa Fe River system is one of Florida’s largest examples of a karst system, where the entire upper Santa Fe River is captured by a swallet (River Sink) flowing into the Floridan aquifer groundwater system and emerging at River Rise approximately three miles downstream. The map below shows groundwater contours for the upper Floridan aquifer, with the higher levels in the east near the Keystone Heights area and lower levels along the Santa Fe River in northwest Alachua County.
More information on the geology and springs of Florida can be found on the Florida Geological Survey website. The report “Springs of Florida” can be found here.
The following description of Poe Springs is from that document:
Poe Spring is bordered by a man-made retaining wall. It forms a circular conical depression where there is exposed limestone. The depth measures 18.7 ft (5.7 m)pool 120 ft (36.6 m) in diameter. The vent is on the south side of the pool at the bottom of a over the vent and a boil is present on the spring surface. The water is clear with a blue-greenish hue. The spring has an exposed sand bottom resulting from heavy use. Aquatic vegetation and algae are sparse within the spring. A steep, underwater limestone ledge is on the east side of the vent. The spring run is swift and short, flowing approximately 75 ft (22.9 m) northwest into the Santa FeRiver. The river in this vicinity is choked with exotic aquatic vegetation, but none occurs within the spring or its run. Pavilions and picnic tables are on the east side of the spring. A wooden boardwalk is on the south side of the pool. Land around the spring is low-lying river flood plain. Dense mesic hardwood forest occurs to the south and west of the spring.
More information on Poe and springs related issues can be found on the Santa Fe Springs Working Group website.