It's an 18 mile section banked with willows and cotton woods, the more occasional pecan and post oak as you go down, and the mighty sycamore every where, which are snow white in their pristine condition this time of the year.
Not as many Hackberry's than up river; meaning that you won't see as many redbirds, Cardinals, though we did see some - summer tomato red in this first break of spring.
Woodpeckers and sand pipers and kingfishers, all of the ducks, herons and egrets ... and many little brown birds which you must an ornithologist to know; even a group of pelicans.
All of the birds of pray; the many hawks and ospreys, the Cara Cara, a Bald Eagle if your lucky, which we were this trip. Owls at night for sure.
It's basically described as a hard wood bottom.
A mix of prairieland dirt cliffs and limestone bed; almost shoals in spots, but we don't call them shoals in Texas, just large limestone borders and slabs at vertical angels. You'll find groups of granite hunks that have been wash down the river system for an unknown, untold amount of eons, originating some 100 river miles up. The Marble Falls area to be exact; back before Man and dams, when 100,000 year floods came in the perfect storm of a rainy year and tropical hurricanes- over and over. And there's jasper and chert and quartz, volcanic rocks of which I should know but don't .... and the ever present Limestone.