The map view here shows a low marsh area next to Lake Houston. Nothing will be built there as it is a flood area. Should be nice views!! Likely not close enough to have a dock for a boat.
The home your talking about is likely built up and NOT in a flood zone. You can always plug in an address at this web site and see if the Harris County Flood Control District has it in or out of the 100yr flood plain. http://www.harriscountyfemt.org/
I just closed a home in Walden on Lake Houston. There is a private country club golf course as well. Let us know if you need assistance looking for homes in this northeast area of town.