Thanks, Amanda Davis, for these pictures of Sullivan Slough and Sullivan Blue Sink.

Is it a sink or a spring? Probably a bit of each: a karst window, where the aquifer is exposed. So at high river water levels, the Withlacoochee River probably runs into it. At low river levels, water probably flows into the river.

Sullivan Blue Sink and Slough, Withlacoochee River

Here’s where it ends up.

The Blue Sink

It gets there through this distributary.

The Sullivan Slough

It runs for about 0.62 miles through the woods.

Also the Sullivan Slough

Here we go into the Withlacoochee River.

The slough where the blue sink enters the river.

You can see the different colors.

Notice where the spring run meets the river.

The mouth of Sullivan Slough from the Blue Sink where it enters the river.

So is it actually a sink or a spring?

See also the pictures by Susan Liden.

Here’s a rough map of Sullivan Slough as pointed out by Tom Baird.

Chervil Distributary, Withlacoochee River, Madison County, FL, in the WWALS map of the Withlacoochee and Little River Water Trail (WLRWT).

And here’s a context map, showing it half way between Florida Campsites Ramp and Madison Blue Spring.

0.83 miles downstream from Florida Campsites Ramp and 0.84 miles upstream from Madison Blue Springs State Park Launch, in the WWALS WLRWT map.

Surface water constantly interchanges with groundwater, all the way down to the Floridan Aquifer.

 -jsq, John S. Quarterman, Suwannee RIVERKEEPER®

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