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Harris County Watersheds > Jackson Bayou

Specific information about the changes in the Jackson 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.
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)
2.5 sq. mi. 3.3 sq. mi. 2.3 sq. mi. 3.2 sq. mi.
TSARP Studied Stream Miles = 15.6 miles Current Studied Stream Miles = 14.6 miles
Drainage area 25.9 sq. mi.
TSARP 1% Rainfall 24hr duration 13.5 in
Total channel miles 37 mi
Allison: Total flooded area < 1 sq. mi.
Allison: Flooded homes <50
Population 9,694
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