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Harris County Watersheds > White Oak Bayou

Specific information about the changes in the White Oak Bayou watershed will be available soon. For information about general changes between the current FEMA floodplain maps and the FEMA Preliminary Flood Insurance Rate Maps, please go to the Watershed main page.

Two of the additional streams along White Oak Bayou, E115-09-00 and E132-00-00, have not been released as part of the Preliminary FEMA FIRMs. For more information click here.


FEMA Preliminary Flood Insurance rate Maps Current FEMA Flood Insurance Rate Maps
1% (100-Yr) 0.2% (500-Yr) 1% (100-Yr) 0.2% (500-Yr)
20.5 sq. mi. 36.6 sq. mi. 17.6 sq. mi. 23.3 sq. mi.
TSARP Studied Stream Miles = 69.9 miles Current Studied Stream Miles = 71.9 miles

Drainage area 111.1 sq. mi.
TSARP 1% Rainfall 24hr duration 13.2 in
Total channel miles 149 mi
Allison: Total flooded area 50.5 sq. mi.
Allison: Flooded homes 11,000
Population 416,067
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