Korbel Champagne Cellars' Bill Owens said the company is aware of the problem and will work to clean it up this week.
"We don't like it either," said Owens, a vice president for production.
Owens said Korbel is working with Don McEnhill of Russian Riverkeeper, a Healdsburg-based nonprofit group that monitors the river, to mobilize boats and a work crew on Wednesday or Thursday.
Old Korbel Winery Dump Site
"With our resources, we can only work from the top of the bank," Owens said. "We have been chasing this thing whenever we can, however Don has some resources (who) are comfortable and competent working in the water."
In the spring or summer, after the threat of winter rains, Owens said Korbel will hire a contractor with an excavator to remove the debris, which he said was dumped there more than three decades ago.
McEnhill said he expects to be able to get 10 boats in the river this week and have the majority of the trash picked up within a day.
He said there have been similar problems along the stretch of river in the past.
"The immediate need is to get all that stuff off so the river doesn't come up and send it all down the river," McEnhill said.
The problem area is a bend where the river channel has shifted over the years, eroding the bank and eating into the vineyard. It is a spot where grapes had been planted over former trash and debris pits.
Owens said several acres of vineyards at that site have been lost to erosion.