http://yubanet.com/regional/Carlon-Falls-Trailhead-Temporarily-Closed.php
No one ever mentioned they'd even ever been there when posted this so... prolly don't matter though.
http://yosemitenews.info/forum/read.php?3,34921,36563#msg-36563
There is also a length restriction over the bridge (Carlon Bridge). 30 ft.
(at least that is what I recall when driving by last Sun)