CORVALLIS, Ore. — A pulp mill company spent $1.9 million last year carving a channel through a gravel bar in the Willamette River so it could discharge waste from its plant upstream of Corvallis without creating a foul-smelling, coffee-colored plume.
But this spring floods choked the channel with gravel, so Cascade Pacific Pulp has begun dredging again in the river that supplies about 70 percent of the city’s drinking water.
The work began Monday, the Corvallis Gazette-Times reported, and was expected to take as long as 10 days and cost $100,000.
Two years ago, the conservation group Willamette Riverkeeper raised concerns about the plume when a gravel buildup kept water out of a zone where the effluent gets diluted before heading downstream.