You might look at this site:
[url=http://www.tpwd.state.tx.us/fish/infish/cfllist/?r=4:8388a]http://www.tpwd.state.tx.us/fish/infish/cfllist/?r=4[/url:8388a]

look for the lakes in Harris County specifically.

Here is another good place to start:
[url=http://www.tpwd.state.tx.us/gofishing/houstonfish/index.html:8388a]http://www.tpwd.state.tx.us/gofishing/houstonfish/index.html[/url:8388a]
[url=http://www.tpwd.state.tx.us/fish/infish/reports/trout_stocking.phtml:8388a]http://www.tpwd.state.tx.us/fish/infish/reports/trout_stocking.phtml[/url:8388a]

This is the site for a Houston Fly Club. Spring is often considered part of the Houston Metro area.
[url=http://www.texasflyfishers.org/:8388a]http://www.texasflyfishers.org/[/url:8388a]

Hope this all helps.

Brian