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| Title | Lower Skagit River Total Maximum Daily Load Water Quality Study | |||
| Month-Year Published | July 1997 | |||
| Online Availability |
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| Short Description |
A water quality study was conducted in the lower Skagit River basin that included the mainstem downstream of Sedro-Woolley and the North and South Forks near Skagit Bay. This study focused on the effects of point and nonpoint pollutant loading on fecal coliform (FC) bacteria and dissolved oxygen (DO) levels in the lower Skagit River. Total Maximum Daily Loads are proposed for FC bacteria, Carbonaceous Biochemical Oxygen Demand, and ammonia to protect the water quality standards for FC bacteria DO. (Also see abstract below) | |||
| Publication Number | 97-326a | |||
| Author(s) | Pickett, P. | |||
| Print Availability | ||||
| Number of pages | 54 pp. + app. (67 total) | |||
| Keywords | ammonia, bacteria, basin, biochemical, chemical, chemical oxygen demand, dissolved oxygen, fecal coliform, flow, marine, meeting, nonpoint, oxygen demand, point source, river, safety, stream, study, TMDL, Total Maximum Daily Load, waste, water, Water Quality | |||
| Subject Waterbodies |
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| Abstract | Long Description |
A water quality study was conducted in the lower Skagit River basin that included the mainstem downstream of Sedro-Woolley and the North and South Forks near Skagit Bay. This study focused on the effects of point and nonpoint pollutant loading on fecal coliform (FC) bacteria and dissolved oxygen (DO) levels in the lower Skagit River. Total Maximum Daily Loads are proposed for FC bacteria, Carbonaceous Biochemical Oxygen Demand, and ammonia to protect the water quality standards for FC bacteria DO. During dry season low flow conditions, the DO water quality standards will be met if mass discharge from point sources remain below the recommended waste load allocations. Marine water quality standards for FC bacteria are expected to be met at the mouths of the North Fork and South Fork Skagit River if the following conditions are met: combined sewer overflow discharges are abated; point source discharges meet permit limitations; several major tributary nonpoint loading sources are reduced; and FC levels in the Skagit River above Sedro-Woolley are reduced to target levels which are more stringent than the Class AA standards. Meeting the long-term goal of all tributary water bodies complying with water quality standards will provide an additional margin of safety for the protection of Skagit Bay. |
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