I will also add that the TPWD releases rainbow trout in many ponds across the state. Several of these ponds are in the Houston area. Check out this page for more information:

2009-2010 Trout Stocking Schedule

Sort by County and look at the following counties:
Fort Bend
Galveston
Harris
Brazoria

Some of these places may be a bit of a drive, depending upon what part of Houston you will be working in.

Good Luck!