# Toxic algal blooms in North Coast and Oregon > Live situation record from CLSTR: https://clstr.news/situations/toxic-algal-blooms-in-north-coast-and-oregon > Updated: 2026-09-02T21:54:20.000Z. Sources: 4. Developments: 2. Toxic algal blooms and cyanobacteria outbreaks have triggered health advisories and harvesting closures across the North Coast and Oregon. In the North Coast region, the Regional Water Quality Control Board issued warnings for several rivers, including the Klamath, Trinity, and Russian rivers, due to toxic algal mats that pose risks to humans and animals. Officials advised against using river water for cooking and recommended keeping children and pets away from the water. In Oregon, the situation has expanded to include significant biotoxin outbreaks affecting estuaries and rivers. The Oregon Health Authority issued a recreational-use advisory for Eckman Lake following the detection of cyanobacteria and high levels of saxitoxin, leading to recommendations against consuming clams from the Alsea Bay estuary. Additionally, mussel and razor clam harvesting have been closed across various coastal stretches due to unsafe domoic acid concentrations. In Portland, an unusually severe cyanobacteria bloom in the Ross Island lagoon has spread to the Willamette River, with researchers describing the water quality as having the “worst... conditions she has observed.” ## Timeline ### 2026-09-02: Oregon faces toxic algae blooms and shellfish harvesting closures Toxic cyanobacteria blooms and high biotoxin levels have triggered shellfish harvesting closures in Oregon's Alsea Bay and reported severe water quality issues in Portland's Ross Island lagoon. 2 sources. https://clstr.news/cluster/oregon-faces-toxic-algae-blooms-and-shellfish-harvesting-closures ### 2026-08-28: North Coast rivers face health advisory due to toxic algal mats A health advisory has been issued for several North Coast rivers after toxic algal mats were discovered, posing health risks to humans and animals. 2 sources. https://clstr.news/cluster/north-coast-rivers-face-health-advisory-due-to-toxic-algal-mats --- Cite as: Toxic algal blooms in North Coast and Oregon. CLSTR, https://clstr.news/situations/toxic-algal-blooms-in-north-coast-and-oregon