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Total Maximum Daily Loads (TMDLs) Program


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The Willamette Basin

Willamette Basin

Proposed Modifications to the Willamette Basin TMDL

The Oregon Department of Environmental quality is proposing to revise the thermal pollution limit for the City of Jefferson’s wastewater treatment plant located at 701 North Second Street, Jefferson OR, 97352. The Jefferson Wastewater Treatment Plant discharges heated effluent to the Santiam River.

The purpose for this TMDL modification is to correct a spreadsheet unit error that resulted in the incorrect calculation of the thermal pollution limit for Jefferson’s wastewater treatment plant.

The public comment period is now closed. For more information, see the following documents:

Additional information regarding the Willamette Basin TMDL, including the Willamette Basin Rivers and Streams Assessment.


TMDL approved by the US Environmental Protection Agency on Sept. 29, 2006

Willamette River Basin Temperature TMDL modeling reports from Portland State University and USGS:

Coast Fork Willamette Subbasin

TMDL approved by EPA on May 17, 1996

Columbia Slough Watershed

TMDL approved by EPA on Nov. 25, 1998

Middle Willamette Subbasin

Rickreall Creek

TMDL approved by EPA on April 18, 1994

Molalla-Pudding Subbasin

TMDL approved by EPA on Dec. 31, 2008

Pudding River 

TMDL approved by EPA on Dec. 18, 1993

Tualatin Subbasin

Tualatin Subbasin TMDL Revision

TMDL approved by EPA on August 7, 2001

Yamhill Subbasin

TMDL approved by EPA on March 16, 1992

   TMDL Report In-Progress (Data analysis and report writing phase) - For updated TMDL.

For more information on the Yamhill Subbasin and TMDL update, see the Yamhill Subbasin TMDLs home page.

Contact Information

 

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Oregon Department of Environmental Quality
Headquarters: 811 SW Sixth Ave., Portland, OR 97204-1390
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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