That is a very cool cut through.The pass Lake Bum is talking about is deeper into Gun Site and Padre and takes 3685' to be useable....it's very narrow and has sheer faced wall on both sides. The one you are asking about at 3605' is outside the points of Gun Site and Padre, it's actually in Padre Bay thus providing access to all the canyons of Padre Bay. The cut Lake Bum mentioned is about a mile further into the canyons.
Chuck