Publications Home || Browse by topic || Browse by program || Ecology website

Publication Summary

Our Ecology website has changed, which can cause broken links.
To report these, please contact us with the publication and broken link.


Willapa River Watershed Temperature Total Maximum Daily Load Study

Publication number Date Published
04-03-024September 2004
VIEW NOW Willapa River Watershed Temperature Total Maximum Daily Load Study (Number of pages: 144) (Publication Size: 3MB)

Trouble viewing? Try these free options.
Author(s) Stohr, A.
Description This technical assessment uses effective shade as a surrogate measure of heat flux to fulfill the requirements of the federal Clean Water Act Section 303(d) for a Total Maximum Daily Load (TMDL) for temperature.

Substantial reductions in water temperature are predicted for hypothetical conditions with mature riparian vegetation, improvements in riparian microclimate, and reduction of channel width. Potential reduced temperatures are less than the Class A standard of 18°C in almost all stream segments evaluated.

In addition to load allocations for effective shade, activities to reduce incoming sediment and increase channel complexity are recommended for compliance with the water quality standards for water temperature.

On January 5, 2005, changes were made in column 5 of Table E1 in the attached pdf.
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

ADA Accessibility
The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188.
Visit Ecology’s website for more information.
Contact Joan LeTourneau at 360-407-6764 or
Keywords creek, Flux, temperature, fish, 303(d), section 303, study, basin, river, water, watershed, Total Maximum Daily Load
WATERSHED Water Resource Inventory Area 24 Willapa
DATA Environmental Information Management (EIM) #ASTO0004


Willapa River Dissolved Oxygen Total Maximum Daily Load: Water Quality Improvement Report and Implementation Plan

Flow Summary for Gaging Stations on the Willapa River and Selected Tributaries

Quality Assurance Project Plan: Willapa River Temperature Total Maximum Daily Load