A first step in recovering salmon and steelhead populations is determining how many barriers exist and where they are located. This information allows us to analyze the fish passage barriers in relation to each other and in the context of the watershed where they are found. The Passage Assessment Database (PAD) project was initiated as a statewide map-based inventory of known and potential barriers to anadromous fish in California. The PAD was developed in 2002 with guidance from the Forum. The Forum continues to guide the development of the PAD.


The PAD is an ongoing project maintained through a cooperative interagency agreement. The PAD compiles barrier data from over one hundred data sources, allows past and future barrier assessments to be standardized and stored at one place, and enables the analysis of cumulative effects of barriers in the context of overall watershed health. Read more about the PAD project or access the PAD data in an interactive map viewer.


The Database Online Review Tool allows users to review the PAD records in a map format and to provide feedback and editing comments back to the PAD team. Please take a moment to review barriers and potential fish passage sites in your area, and help update the PAD. ENTER THE PAD REVIEW TOOL HERE! Please use Firefox for best performance.

In 2021, the Forum's Science & Data Committee contributed to the review and updating of the PAD Methodology & Data Standards (June 2021)


More Information

PAD Coordinator Anne Elston, (916) 327-0716.


Inventory of Barriers to Fish Passage in Coastal Watersheds (13 MB)

Inventory of Barriers to Fish Passage in Coastal Watersheds - Appendices (7 MB)

Fish Passage Assessments