Recent expansion puts Neotropic as a regular resident in Austin (see eBird). In this case, stocky proportions and seemingly long tail indicate Neotropic over Double-crested.
Probably double-crested cormorant; although neotropic cormorant can also occur in Texas, the map at http://www.allaboutbirds.org/guide/Neotropic_Cormorant/id suggests that neotropics are rarer as one gets away from the coast..
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