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Total Dissolved Gas TMDL - Lower Columbia River
EPA approved this TMDL on Nov. 18, 2002
TMDL/Water Quality Management Plan/Response to Public Comment
Order Approving a Modification to Oregon's Water Quality Standards for Total Dissolved Gas in the Columbia River Mainstem (2024)
U.S. Government Commitments in support of the Columbia Basin Restoration Initiative of the Resilient Columbia Basin Agreement
Columbia and Lower Snake Rivers Temperature TMDL
On May 18, 2020, EPA established the Columbia and Lower Snake Rivers Temperature Total Maximum Daily Load.
Dioxin Discharges TMDL - Columbia River (as well as Snake and Willamette Rivers)
EPA approved this TMDL, which covers three key waterways in Oregon, TMDL approved by the Environmental Protection Agency on Feb. 25, 1991
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