You can look up any property in Harris County using this web site set up by the Harris County Flood Control District http://www.harriscountyfemt.org/
It shows a map and it is color coded to show you the 100yr, 500yr flood zones as well as flood ways and other information.
Would highly recommend buying flood insurance on any home. When your not in the 100yr flood plain, the lender will not require you to purchase it. However, when not in the 100yr flood plain, it will be fairly cheap! $250-$375 a year. A flood can happen anywhere and with the way it rains in Houston, not a bad investment.
I'm closing a home in Walden on Lake Houston today for a seller. Let me know if you need assistance as I show homes all through that area.
Bernstein Realty, Inc.