Qualla: The Laguna de Santa Rosa: Sonoma County's Hidden Sea

The Laguna de Santa Rosa: Sonoma County's Hidden Sea: Introduction

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit bluesbby from Mountain View, USA, CC BY 2.0. Do not eat the black bass. That advisory, issued by the California Office of Environmental Health Hazard Assessment, is perhaps the strangest introduction to a place the Ramsar Convention has designated a wetland of international importance. The Laguna de Santa Rosa is both things at once -- a 22-mile ribbon of marshes, floodplains, and vernal pools that drains a 254-square-mile watershed across the Santa Rosa Plain, and the most impaired water body on California's entire North Coast, listed under the Clean Water Act for six separate pollutants. More than 200 species of birds rest, feed, and nest here along the Pacific Flyway. Endangered coho salmon and steelhead trout still swim its tributaries to spawn. Bald eagles, golden eagles, and osprey hunt its waters. The Laguna is a paradox written in water: degraded and extraordinary, poisoned and teeming with life.

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Image: bluesbby from Mountain View, USA | CC BY 2.0

The Laguna de Santa Rosa: Sonoma County's Hidden Sea: An Ocean's Memory

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Chrisw80, CC BY-SA 4.0. The land beneath the Laguna remembers a time when none of this was land at all. As recently as the Miocene period, the entire Santa Rosa Plain lay submerged beneath the Pacific Ocean. Around twelve million years ago, volcanic eruptions and tectonic uplift thrust the Mayacamas and...

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Image: Chrisw80 | CC BY-SA 4.0

The Laguna de Santa Rosa: Sonoma County's Hidden Sea: A Century of Wounds

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit User:Anlace, CC BY-SA 3.0. In 1833, the first Mexican land grant carved up the Laguna's watershed for ranching. By 1870, the railroad had arrived, bringing channelization and intensive agriculture. What followed was more than a century of ecological decline. The cities along the US-101 corridor -- Santa Ro...

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Image: User:Anlace | CC BY-SA 3.0

The Laguna de Santa Rosa: Sonoma County's Hidden Sea: What Refuses to Disappear

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Melissa McMasters from Memphis, TN, United States, CC BY 2.0. Despite everything, the Laguna's biology is staggering. The wetland complex remains the most biologically diverse area in all of Sonoma County, a place scientists have called a 'national treasure.' California tiger salamanders breed in its vernal pools -- those ephemeral puddles ...

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Image: Melissa McMasters from Memphis, TN, United States | CC BY 2.0

The Laguna de Santa Rosa: Sonoma County's Hidden Sea: Turning the Current

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Frank Schulenburg, CC BY-SA 3.0. The turnaround began in 1989 with the founding of the Laguna de Santa Rosa Foundation, a nonprofit that set out to reverse more than a century of neglect. Progress came slowly and from multiple directions. Santa Rosa upgraded its wastewater treatment to tertiary levels and began ...

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Image: Frank Schulenburg | CC BY-SA 3.0