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Title

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)




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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.
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Contact Joan LeTourneau at 360-407-6764 or jlet461@ecy.wa.gov
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

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

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