Why is it surprising that USGS calls it a gut  Sloughs are often guts  There is nothing in this article that indicates it is anything but a gut or slough not an estuary  The friends may be a reliable source who knows Im told that if  blogs say something in agreement it can be considered reliable information  If there are no reliable sources that say its an estuary that  information should be removed  I would tag it as inaccurate but I am under threat of permanent community ban if I should question facts on Wikipedia in articles  Its your article you want to call a slough an estuary okay  I would just like readers to know its unsourced information that appears to have nothing in the article backing it up  Ive done that  I wash my hands of this inland stagnant water estuary