Humboldt Bay faces fastest sea level rise in California

A new North Coast Regional Report, part of California’s Fifth Climate Change Assessment, warns that Humboldt Bay is acting as a ‘canary in the coal mine’ for sea level rise in the state. The report indicates that the region's shoreline is changing more rapidly than anywhere else on the West Coast, leaving local communities with a limited window to prepare.

Geological factors are contributing to the acceleration; while some northern coastal areas are being pushed upward, the land around Humboldt Bay is sinking. Since 1970, the bay has seen approximately one foot of sea level rise. Data from the North Spit tide gauge shows about 6.6 inches of rise since 2000, marking the fastest relative sea level rise of any NOAA station on the West Coast.

The 221-page document, co-authored by Cal Poly Humboldt professors Rosemary Sherriff and Andrew Stubblefield, covers Humboldt, Mendocino, Del Norte, Lake, Siskiyou, and Trinity counties. It highlights vulnerabilities such as aging infrastructure that lacks redundancy, increased wildfire risk, and extreme weather. The report emphasizes the importance of integrating climate science with Tribal knowledge and local community strategies to build regional resiliency.