Sept. 15, 2024*
The Willamette Subbasins TMDL and the Lower Columbia-Sandy Subbasins TMDL for temperature were adopted by the Environmental Quality Commission into rule on Aug. 6, 2024. EPA approved the TMDL on Sept. 12, 2024.
Willamette Subbasins**: Coast Fork Willamette, McKenzie, Middle Fork Willamette, Upper Willamette, Middle Willamette, Molalla-Pudding, North Santiam, South Santiam, Lower Willamette, Clackamas Subbasins, McKenzie River to confluence with the South Fork McKenzie River (approximately river mile 56), South Fork McKenzie River to Cougar Dam (approximately river mile 4), and Blue River to Blue River Dam (approximately river mile 1.9)
Lower Columbia-Sandy Subbasin
*The court approved an extension for these TMDLs.
**This TMDL will exclude the Willamette River mainstem and major tributaries. TMDLs for the Willamette River mainstem and major tributaries will be developed and issued for EPA’s approval or disapproval by Feb. 28, 2025.
June 28, 2025*
On May 8, 2025, the EQC adopted a rule amendment to include Willamette mainstem and major tributaries project area. EPA approved the TMDL on June 25, 2025.
EPA issued the Umpqua River Basin TMDL on June 27, 2025.
EPA's Umpqua River Basin Temperature TMDLs web page.
Umpqua River Basin (North Umpqua, South Umpqua, and Umpqua Subbasins), excluding the Little River Watershed TMDL (2001)
*The court approved an extension for these TMDLs.
Oct. 18, 2027
Dec. 4, 2028
Nov. 29, 2029
Walla Walla Subbasin
Willow Creek Subbasin
Malheur River Subbasins
Additionally, DEQ is updating the following TMDLs for temperature:
Upper Sucker Creek TMDL (1999)
Lower Sucker Creek TMDL (2002)
Lobster Creek Watershed TMDL (2002)