55 -- just fyi (and you may already know this) -- Westlake is north of Fort Worth on a "corridor (Hwy 114)" of Southlake (yeah, the school that wins a lot), Trophy Club, Roanoke, and Justin. Once you go west of Southlake, there are actually only a couple of High Schools in the immediate area (Byron Nelson and Northwest), but other school districts are very close -- Grapevine/Colleyville, Keller, Lewisville, and Denton. All but Lewisville ISD (and one Denton school) are currently being worked by the FW chapter. These school districts have gone back and forth between Dallas and FW over the last 20 years. Dallas worked Southlake last year, and ALL the rest as late as recently as 2009, I think. Keller might have been FW earlier.
You're not going to have any problem getting a varsity schedule in either chapter, though your first year, you'll probably work mostly lower level (private through medium sized public) games and with multiple crews or guys out of the pool. After the first year, you can probably either get on a crew, fill in on one that has a college official, or even just work out of the pools with a fairly decent schedule -- assuming you can work and in a position with some demand (BJ currently with some R). As far as small college, a little tougher, but not impossible. You'll probably want to start going to camps around here and work toward the small D1 conferences.
Let us know what you decide. We can always use another good official.