Explore Potential Flood Impacts
in the Lower Skagit Watershed
through Modeling Scenarios
Major Flood Scenario
Choose Levee Scenario

All Levees
Left Levees
Right Levees
No Levees

+0 in
+11 in
+29 in

Choose Year/Projected Sea Level Rise
Additional Information
About This Project
This tool compares the current floodplain in the Skagit Watershed (specifically, the regulatory 100-year floodplain as defined by FEMA) with a projected future floodplain based on climate change and sea level rise research. The projected future floodplain is based on research developed by a team of SC2 members and focused on 140 square miles of the Lower Skagit River’s floodplain. The researchers used a hydraulic model of the river channel and floodplain including information on runoff from the upper watershed, potential levee scenarios, and tidal water levels to establish projected flood levels for the 2040s and the 2080s. For more information on the modeling, click on the download link at the top-right hand corner of this panel.
Get the Data
ESRI Shapefile Format
Google Earth KMZ Format
Fire Departments
Approximate Water Depth
Model extent
Open Water
Less than 1 ft
1 - 3 ft
4 - 6 ft
7 - 11 ft
12 - 17 ft
18 - 26 ft
Layer Transparency
Important To Read
The authors of this website do not condone the use of these visualization products for any particular purpose, and users of the site do so entirely at their own risk. The purpose of this website is to visualize simulated inundation scenarios at 400-ft resolution from the Hamman et al. (2015) study to make more publicly available scientific information in order for people to have information that leads to more informed questions and decisions. These scenarios should not be confused with "predictions" of actual conditions at a specific future time and place. The exact timing and nature of future extreme events is not known and may be substantially different from those shown here. In particular, the location and extent of levee failures during extreme events, which has a strong influence on local flooding, cannot be accurately forecast.
I Understand

This project has been funded in part by the United States Environmental Protection Agency under assistance agreement 00J30901-0 to the Swinomish Indian Tribal Community. The contents of this website do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. Additional support has graciously been provided by the City of Anacortes and Seattle City Light in support of Skagit Climate Science Consortium activities.
The raw value from the major flood scenario is ft.
This suggests an approximate water depth range of ft.