Tag Archives: Mathis Sink

Pictures: Alapaha and Dead River Sinks 2016-11-06

the Alapaha River sink, 30.5855189, -83.0528064 A very scenic hike to some of the most unusual geological features in all of Florida: the Alapaha River Sink and the Dead River Sink. We walked over beds of 50-million-year-old fossilized oysters, above all our drinking water in the Floridan Aquifer. See many pictures and a few videos of the sights, and a google map of the sites.

Practicing Geologist Dennis Price led us by the scenic route on this hike, explaining the karst geology on display, which underlies all of north Florida and south Georgia, containing our drinking water in the Floridan Aquifer. Dennis and hike organizer Chris Mericle recommend making this very unusual area a state park.

The Alapaha River goes underground here unless it has a lot of water, which usually this time of year and right now it does not.

[Don't fall into the Devil's Den, 30.5855189, -83.0528064]
Don’t fall into the Devil’s Den, 30.5855189, -83.0528064

Update 2022-11-17: The Jennings Gauge read 61.70′ NAVD88.

Until recently nobody knew for sure Continue reading →

Dye test in Dead River Sink on Alapaha River

Update 2016-06-22: Dye test into the Dead River Sink: it came back up several days later and eighteen river miles south, in the Alapaha River Rise and Holton Bluff Spring, both on the Suwannee River.

The Alapaha River disappears underground in dry seasons, and nobody has ever known where it comes back up. Soon, we will know.

Green Publishing, 16 June 2016, Dye test held for river basins,

The Florida Geological Survey will be conducing a dye test for the Suwannee River Water Management District in the Upper Suwannee/Alapaha River basins later this month. They will introduce dye into the Dead River Swallet (swallets are sinkholes that capture flow) and a swallet that is located on privately owned land. They will also have sampling devices setup at Continue reading →