If you need up to date info on road closures, here are some helpful sites.... (I didn't code them, but am familiar with the TXDOT site from the back side, and it is updated with a high frequency.)

I had relatives getting out yesterday and used these to help guide them out. Your best bet is to compare all 3, to get as much info as possible concerning if your selected route out of there is open. Even then, be careful!!!!!

Drive Texas: (click on closure/flood segments for info on which side of the roadway)
Closure lines are dark blue.....water over road lines are light blue.
https://drivetexas.org/#/13/29.5653/-95.7041?future=false

Google maps with traffic:
https://www.google.com/maps/@29.5547428,-95.656766,13z/data=!5m1!1e1

Houston Transtar google maps interface:
https://traffic.houstontranstar.org/layers/layers_ve.aspx?&inc=true&rc=true

My cousins were able to run i-10 westbound from Beltway 8 to Katy about 10 minutes ago. Hope this helps y'all.

My prayers are with y'all down there!

TTT folks still need this info.