Coastal Flooding & High Water Marks

Portland and South Portland are launching new initiatives dedicated to building community awareness of coastal flooding.

Portland and South Portland have deep historical, cultural, and economic ties to the waterfront. However, this low-lying land is particularly vulnerable to flooding from coastal storms and will be increasingly vulnerable as sea levels rise. The Cities can’t prepare for this future alone; the knowledge and experiences of community members are central in planning for coastal flooding.

Get involved with several new initiatives in both cities!

High Water Marks

High Water Marks in Portland and South Portland show where flood levels for a historic storm, like the Blizzard of 1978, could be in the future without significant climate action. Visit each location below to learn more and visualize potential flood levels in 2050.

Portland High Water Mark locations:

Fore River, Back Cove, Eastern Prom Trail, Portland Pier

Click Here for More Info

South Portland High Water Mark locations:

Mill Creek, Bug Light Park, Willard Beach

Click Here for More Info


Coastal Flooding Citizen Science

This citizen science project, developed by the Gulf of Maine Research Institute, invites you to document water level and flooding impacts at coastal flood monitoring sites throughout Portland and South Portland. Pictures and observations will help inform city planning efforts ad build a shared understand of the ways in which our communities may be most vulnerable to coastal flooding.

Visit GMRI’s  Ecosystem Investigation Network to begin collecting data.

Watch an informational webinar about how to begin collecting data:

Portland Webinar

South Portland Webinar