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Floodplain Maps
The Federal Emergency Management Agency (FEMA) issues maps that are used to review development projects in the floodplain, and set flood insurance rates.

How to Get Floodplain Maps
Maps are available from the following sources:
  • Paper copies can be viewed at the City's Public Works Engineering office, 1775 12th Ave. N.W.
  • Maps can be printed or purchased online from FEMA.
  • Visit King County's online iMAP (selet "100-Year Floodplain in the layers)
  • Scanned copies can be downloaded below.

Scanned Copies
Flood Insurance Rate Maps (FIRMs)

These maps cover large areas and often can't be used to identify whether a specific property is in the floodplain. All areas of the City that have mapped flood hazard areas are shown, including Issaquah Creek, East Fork Issaquah Creek, North Fork Issaquah Creek, Tibbetts Creek and Lake Sammamish. These maps incorporate the 2002 Issaquah Creek Flood Insurance Study (FIS) update, and are effective as of April 19, 2005.

  • Index page (2005) 
  • Panel 680F - Lake Sammamish, Greenwood Point (1995)
  • Panel 685F - Lake Sammamish, East Lake Sammamish Parkway (1995)  
  • Panel 687F - Tibbetts Creek (1995). This map is amended by several LOMRs; see below.
  • Panel 691H - NW quarter of valley (2005). This map is amended by the East Fork AO Zone LOMR and the Juniper Bridge LOMR; see below.
  • Panel 692H - NE quarter of valley (2005). This map is amended by the East Fork AO Zone LOMR; see below.
  • Panel 693H - SW quarter of valley (2005)
  • Panel 694H - SE quarter of valley (2005)


FEMA Work Maps
These maps - which correspond to the FIRMs and show greater detail for floodplain areas on Issaquah Creek, East Fork Issaquah Creek, and North Fork Issaquah Creek - are available in CAD format. They are also known as the Montgomery Water Group maps for the 2002 FIS update, and include subsequent LOMRs.


Letter of Map Revisions (LOMRs)
These maps are used to document interim changes to FIRMs (such as floodplain improvement projects or corrections to the original FIRMs).


Letter of Map Amendments (LOMAs)
These maps are used by FEMA to make floodplain determinations on individual properties, as requested by property owners. If the FIRMs doesn't clearly show your property, then in most cases you will need to submit a LOMA to FEMA for their review. A LOMA typically requires elevation data on your property that is prepared by a professional surveyor. 

LOMAs can be obtained on FEMA's website, and the City may have copies in our permitting files. 

Maps for Older Buildings
To obtain copies of earlier FIRMs that are now out-of-date, but can be used for "grandfathered" flood insurance rates, please contact the City.  Maps were issued in 1980, 1989, 1995, and 1998.  For pre-1980 buildings (known as "pre-FIRM" buildings), there are no maps for flood insurance purposes because floodplain regulations in Issaquah didn't exist prior to that time.   

Contact Us
For more information on floodplain mapping, contact Kerry Ritland, Surface Water Manager, at 425-837-3410.