Snohomish County Flood Insurance Study (FIS)

Purpose

The Flood Insurance Study (FIS) developed the flood risk data for the various areas of the county, which is used to establish flood insurance rates and as a basis for the county's floodplain management programs. The analyses used to prepare the FIS are also used to prepare the Flood Insurance Rate Maps (FIRMs), which show flood hazard areas in the county.

The FIS provides information to supplement the FIRM, some include:

FIS Volume 1

FIS Volume 2