•    Webmap of proposed changes to 100-year floodplain
•     Draft Flood Insurance Study (12.58 MB)
•    Appeals Process
•    How does this affect me?


What's New?

Updated June 1, 2017

FEMA has released preliminary updates to Flood Insurance Rate Maps (FIRM) and to the Multnomah County Flood Insurance Study (FIS), reflecting flood hazards within the vicinity of the lower Columbia River and Sandy River in east Multnomah County. 

The preliminary flood maps and study are in a 90-day appeal period which closes August 15, 2017.


What’s happening?

The Federal Emergency Management Agency (FEMA) is proposing changes to some parts of the 100-year floodplain. This area has a 1% chance of flooding in any given year. These changes are based on new information and engineering studies.

FEMA flood maps help local officials and residents identify flood risks. They are used for flood insurance and development review.

FEMA hosted a public meeting at Gresham City Hall on June 27, 2016 to present maps of the updated flood plain. Residents and property owners had a chance to learn about the flood mapping process and what the changes mean for them. Staff with the Oregon Department of Land Conservation and Development and Multnomah County Land Use Planning were also  on hand to answer questions.

If you missed the meeting, you can still contact us or your city to find out more.

Appeals Process

  • Ordinance adoption includes a mandatory 90-day appeal period.
  • The appeal period begins May 17, 2017 and ends August 15, 2017.
  • Please mail or email your comments or mail your appeals to the contact below.
  • Comments reflect corrections or clarifications pertaining to misspellings, labeling, and/or missing information.
  • All appeals must include information demonstrating that the elevations and/or delineations are scientifically and/or technically incorrect. Appeals must be supported with scientific and technical data and mapping demonstrating that alternative methods or applications result in more correct estimates of base flood elevations.

To file an appeal within Multnomah County, submit a signed letter with the corresponding technical information to:
Adam Barber, Senior Planner
1600 SE 190th Ave
Portland OR 97233.

Comments reflecting corrections or clarifications can be mailed to Adam Barber at the address above or emailed to: adam.t.barber@multco.us.

Adoption Process

The Multnomah County Planning Commission will consider adoption of revised Flood Insurance Rate Maps and Flood Insurance Study after the conclusion of the 90-day appeal period. 

Meeting agendas and staff reports to be considered by the county Planning Commission are posted online.

A simple map showing the area of the flood map updates. If you cannot read the map, please call 503.988.3043 for assistance.
Am I affected?

FEMA’s changes include areas around the lower Columbia River and Sandy River watershed in east Multnomah County. The map to the right shows the general area affected. Our interactive webmap shows the changes in more detail.

What does this mean for my property?

FEMA answers the most common questions here.

If you live in Gresham, Fairview, Troutdale or Wood Village, and have more questions:
Please contact your city’s planning department.

In unincorporated Multnomah County:
•    Review the proposed changes on our interactive map
•    If you have further questions, ask a planner