In case you didn't know, TXDOT is on Twitter, and they have a specific page just for San Antonio closures. If you have twitter, follow @TxDOTSanAntonio for up-to-the-minute info in road closures and re-openings.
Don't have a twitter account? No worries! Click on the same link and you will see a complete list of all TxDOTSanAntonio posts, without having to sign up for an account. But you also won't get the alerts in real time like you would if you had an account. Either way, it is faster and easier than searching their official website for info.
Speaking of Twitter, About.com San Antonio will soon be tweeting, so stay tuned!