Humboldt Wetland Restoration & Mitigation Database
Publication Date
9-2026
Abstract
This database brings together restoration and mitigation project data for wetlands and eelgrass in and around Humboldt Bay, alongside referential layers, such as historic saltmarsh extent, to support future restoration planning. The scope of the database is limited to projects that have restored tidal influence, created or restored tidal slough channels or wetland channels, restored wetland contours, or created off-channel ponds. Projects were excluded that only performed invasive plant removal, vegetation management, or fish passage barrier removal.
Project data was sourced from Coastal Development Permits and a collection of restoration project documents called the Low Tide Archive. All of the referenced documents that are not hosted by a government agency on the web may be found in the Humboldt Wetland Restoration & Mitigation Database Collection on Cal Poly Humboldt’s Digital Commons.
Note: this is not a complete record of every restoration effort in Humboldt Bay. If you are aware of a tidal or wetland restoration project not shown here, please contact Humboldt Waterkeeper at [email protected].
This database may be updated occasionally, to view the most recent data see this web map: https://arcg.is/jOnnK
Acknowledgements
The following people provided project locations, details, reference data, and/or feedback that significantly improved the content and quality of this data:
-
Aldaron Laird, environmental consultant
-
Adam Wagschal, environmental consultant
-
Whelan Gilkerson, local eelgrass expert
-
Hank Seemann, Humboldt County Public Works Director
-
Andrea Pickart, USFWS Biologist, dune restoration expert
-
Heidi Carpenter & Cori Flannery, CDFW Marine Region
-
Kyle Morgan, Cal Poly Humboldt Librarian and Digital Commons Steward