The Lower American River starts below Folsom Dam (Folsom Lake) and runs 49.2 km to the river's confluence with the Sacramento River. This portion of the river is very wide and shallow and moves swiftly as it passes through an urbanized area; it is buffered by riparian parks, cycle paths, and is used extensively for recreation. The majority of the flow in this section of the river throughout the year is a controlled discharge from the Folsom Dam. Local storm drains, small ephemeral channels and an extensive network of organized storm drain collection and pump stations discharge excess rainfall from surrounding urban and suburban environments into the Lower American River channel. The current study was designed to systematically investigate the nature, timing, likelihood, and scale of potential pyrethroid detections. This objective was accomplished through (1) various rainfall event-driven sampling studies during the 2011-2012 and 2012-2013 rainy seasons and (2) a robust, multi-site, spatio-temporal transect study, appropriate for investigating a river system of this size and scale. Results demonstrate that pyrethroid residues have generally been low and infrequent.

Pyrethroid monitoring of the Lower American River in California (USA)

246th National Meeting (2013)

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