Google Maps is showing an alternate route from Houston that goes south along the coast. One would exit I10 at Winnie, take 73 to Port Arthur, take 82 to Holly Beach then take 27 to rejoin I10 at Sulphur. The Beaumont police have just said this route is open but not recommended since it is a small road with many vehicles on it.
https://www.google.com/maps/dir/Hous...31!2d30.039321
A longer alternative route is to go up Hwy 59 to Luffkin, take 103 then 21 through the Sabine National Forest to Many LA, take 45 to Opelousas, then 190 to Baton rouge where you will rejoin I10. The Sabine County Sheriffs Office said that route is open. This route is significantly shorter than going through Shreveport.
https://www.google.com/maps/dir/Hous...d30.039321!3e0