Troublesome water weed poses unknown danger for the Truckee River

Eurasian watermilfoil is an exotic and aggressive invader.

A troublesome water weed that has spread through Lake Tahoe for decades is now established along the length of the Truckee River, posing possible problems of unknown scope and scale.

From the outlet of the Tahoe City Dam to where the river flows into Pyramid Lake 116 miles downstream in the desert, anywhere the river’s waters flow slowly enough Eurasian watermilfoil can be found, experts said.

“It goes all the way to the end of the river,” said John Mosely, environmental director of the Pyramid Lake Paiute Tribe. “In every irrigation diversion, in every backwater, we can find it.

“It’s a huge concern,” Mosely said.

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