This TMDL project includes the following Willamette Subbasins:Coast Fork Willamette, McKenzie, Middle Fork Willamette, Upper Willamette, Middle Willamette, Molalla-Pudding, North Santiam, South Santiam, Lower Willamette, and Clackamas Subbasins.
This project does not include waterbodies in the Tualatin Subbasin, Yamhill Subbasin, the Willamette River mainstem, and most of the major tributaries to the Willamette River. The temperature TMDLs for the Willamette River mainstem and major tributaries (exact extent summarized below) will be developed as a separate project with rule advisory meetings expected to begin in 2023 and scheduled for EPA approval or disapproval by Feb. 28, 2025.
Waterbodies in the Willamette mainstem and major tributaries project area include:
Willamette River including all side channels and sloughs from the confluence of the Columbia River to the confluence of Coast Fork of the Willamette and Middle Fork of the Willamette Rivers (approximately river mile 187)
Clackamas River up to River Mill Dam/Estacada Lake (approximately river mile 26)
Santiam River (all 12 miles)
North Santiam River up to Detroit Dam (approximately river mile 49)
South Santiam River up to Foster Dam (approximately river mile 38)
Long Tom River to Fern Ridge Dam (approximately river mile 26)
Middle Fork Willamette to Dexter Dam (approximately river 17)
Fall Creek to Fall Creek Dam (approximately river mile 7)
Coast Fork Willamette to Cottage Grove Dam (approximately river mile 30)
Row River to Dorena Dam (approximately river mile 7.5)