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Fig. 1. Specific sampling locations near the Calapooia River, Willamette Valley, Oregon. (1) A fallow perennial ryegrass seed production field (44°32'02'' N, 123°08'29'' W). (2) A field drainage location as it enters a forested riparian area (44°31'58'' N, 123°08'28'' W). (3) A forested riparian area (44°31'55'' N, 123°08'31'' W) and (4) its drainage to the Calapooia River channel (44°31'55'' N, 123°08'36'' W). (5) Surface sediment at the river's edge (44°31'55'' N, 123°08'36'' W). (6) A cut bank on the opposite side of the river (44°31'55'' N, 123°08'37'' W).
