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Harris County Watersheds > San Jacinto River (north of I-10)

Specific information about the changes in the San Jacinto River 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)
87.0 sq. mi. 98.6 sq. mi. 70.0 sq. mi. 77.5 sq. mi.
TSARP Studied Stream Miles = 110.1 miles Current Studied Stream Miles = 105.9 miles

Floodplain areas for Harris County Only

Drainage area 217 sq. mi.
TSARP 1% Rainfall 24hr duration 13.2 in
Total channel miles 278 mi
Allison: Total flooded area 11 sq. mi.
Allison: Flooded homes 2,900
Population 148,370

Data for areas inside of Harris County only.
  © 2008 FEMA and Harris County Flood Control District. All rights reserved. Terms & Conditions