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Lake Loma Phosphorus Screening-Level Assessment

Publication number Date Published
13-03-031October 2013
VIEW NOW Lake Loma Phosphorus Screening-Level Assessment (Number of pages: 39) (Publication Size: 879KB)

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Author(s) Roberts, M.
Description Lake Loma has exhibited high chlorophyll levels and is on Ecology’s 303(d) list of impaired waters for total phosphorus. Total phosphorus levels will require a 48% reduction to achieve a concentration of 20 ug/L. This assessment identified the relative source contributions to ensure that management activities focus on dominant sources. Onsite sewage systems (OSS), animals, and lake sediments are the dominant sources, while fertilizer applications and atmospheric deposition are secondary sources. Fish stocking and recreational use produce little phosphorus. These patterns held whether analyzed on an annual average or peak seasonal basis, and both with and without considering attenuation. Management actions should focus on reducing dominant external sources, although internal loading may not reflect reductions for years to decades.
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Keywords birds, internal loads, Lake Loma, load estimates, on-site sewage, phosphorus
WATERSHED Water Resource Inventory Area 07 Snohomish

Quality Assurance Project Plan: Lake Loma Total Phosphorus Technical Study