(Portland, OR) -- There's a recreational health advisory for the Willamette River from Ross Island to Kelly Point Park and the Wapato Bridge to Sauvie Island. The Oregon Health Authority is investigating algae that has grown in the river. It's being tested to determine whether it contains hazardous toxins. They're advising no swimming in that section of the river and no high-speed water sports. Drinking the water is dangerous, especially for children and pets.