USGS Coastal Storm Modeling System (CoSMoS)
CoSMoS Availability in Washington
CoSMoS is currently being rolled out in Washington. This page provides an overview of what products exist, when they are expected for different locations around the state, and how you can access those products.
Overview of CoSMoS Products
There are three total CoSMoS products:
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- Coastal Overland Flooding – exposure data for coastal flooding based on coastal storm and sea level rise scenarios
- Coastal Groundwater – exposure data for groundwater depths based on sea level rise scenarios
- Shoreline Change – exposure data for shoreline change hazards (e.g., erosion) based on sea level rise, storm, and coastal management scenarios
How to Access CoSMoS Products
CoSMoS products are available in two formats:
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- Interactive Web Tool – USGS Hazards Exposure Reporting and Analytics (HERA)
- Downloadable Geospatial Files
View the Products via the HERA Web Tool Here
View the Downloadable Geospatial Data Here
CoSMoS Product Rollout Timeline
A helpful table is provided below to show the expected delivery dates of each product in Washington. Overland Flooding products are already available for Whatcom, King and Pierce couties. Flooding products for other Salish Sea locations are estimated to be available between 2026-2027. Groundwater products are currently available for all of Puget Sound, and expected to be available to the Pacific Coast by early 2026. Shoreline Change products will also be made available to the Pacific Coast in the future (timeline forthcoming).
Timeline of USGS CoSMoS hazard products availability (geospatial data downloads). Unless otherwise noted, products are integrated into the HERA Web Tool approximately 4-6 weeks later. Last updated: February 11, 2026.
Groundwater
| Geography | Estimated Availability |
| Puget Sound counties (Whatcom, Skagit, Snohomish, King, Pierce, Thurston, Mason, Kitsap, San Juan, Island, eastern Jefferson, Clallam) | Available now |
| Pacific Coast counties (including western Jefferson, Grays Harbor, and Pacific) | Fall 2026 |
Coastal Flooding
| Geography | Estimated Availability |
| Whatcom, King, Pierce counties | Available now |
| Kitsap, Snohomish counties | Mid 2026 |
| Thurston, Mason counties |
Late 2026 |
| Eastern Jefferson, Skagit counties |
Mid 2027 |
| Clallam (Strait of Juan de Fuca shoreline), San Juan, Island counties |
Late 2027 |
| Pacific Coast counties (including western Clallam and Jefferson, Grays Harbor, Pacific) |
Not funded at this time |
Shoreline Change
| Geography | Estimated Availability |
| Pacific Coast of Jefferson, Grays Harbor, Pacific counties | Late 2026 |
| Clallam County | TBD (possibly 2027) |
| Remaining Puget Sound counties | Not funded at this time |
Bluff Retreat
*Bluff retreat products are not included in HERA at this time
| Geography | Estimated Availability |
| Whatcom, King counties | Early 2026 |
| Remaining Puget Sound and Strait counties | Late 2026 |
| Pacific Coast counties | Not funded at this time |
