A warning to anyone going in or near the Tualatin River this weekend: the water could be toxic.

According to Tualatin Riverkeepers it’s full of an algae that could be harmful to humans and potentially deadly for animals.

On Wednesday the group noticed an unusually large amount of blue-green algae. In some cases blue-green algae can be toxic. As a result signs are now posted warning people to stay out of the water.

A Newschannel 8 crew paddled up the river to see how bad of a problem it is. They found the aqua colored goo scattered across the water.

Brian Wegener is the Watershed Watch Coordinator for Tualatin Riverkeeper. He says he's been paddling the Tualatin for nearly two decades and has never seen anything like this before. Some types of blue-green algae can produce toxins that if ingested can be harmful to humans and pets.

“In Oregon these types of algae blooms can kill 8 or 9 dogs a year in different water bodies this is the first time I’ve seen it in the Tualatin,” said Wegener.

Washington County, today, increased flow from Hagg Lake to help cool the water and clear up the algae. Scientists from the USGS took samples of the water on Wendesday.

It’s currently running tests to if it is indeed toxic. Those tests results should be in tomorrow.