I've talked about the problem of subsidence before in my post about Brownwood, the sinking neighborhood. What you're looking at here is a small creek running into a marshy lake (Mud Lake), that connects to an estuarine lake (Clear Lake), which then connects to Galveston Bay. However, after subsidence lowers the area by ten feet in some places, the bay waters can expand farther inland creating a large and very slow moving bayou setting.
This was 55 years ago.
That creek isn't so little anymore.
You can find it yourself on Google Earth using these coords: 29°34'44.79"N 95°04'13.52"W