French Slough Floodplain and Watershed

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Agricultural use is enabled by a pump station and drainage channel network, managed by the French Slough Flood Control District. The pump station has a fish ladder which does not allow for full fish passage, located where French Slough meets the Snohomish River. In the slough, summer temperatures are high enough to injure fish, and results in low oxygen levels. The site is listed (303d) for Clean Water Act violations. Suburban and agricultural land use contributes nutrients that exacerbate low oxygen levels. Rural residential development is increasing in the uplands, between the towns of Monroe and Snohomish, increasing runoff.

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Source: French Slough Floodplain and Watershed on Salish Sea Wiki