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Several studies on the Sacramento River provide evidence for the distribution of outmigrating fish (specifically juvenile salmonids) toward the outer sides of bends, including at Clarksburg Bend (Figure clark1), the Delta Cross Channel (Figure DCC1), and near Fremont Weir (Figure fremont1). The distribution of fish towards the outside of bends is the result of centrifugal and pressure forces in bends which induce a secondary flow that lies in a plane perpendicular to the primary flow direction (Dinehart and Burau 2005) and is reflected in the bathymetry of such areas: the deeper areas, including the thalweg, coincide with the areas subject to the secondary flow (Figure clark2). These observations agree with the general pattern of downstream-migrating juvenile salmonids in the Pacific northwest often being distributed near the thalweg, or near the shoreline (Smith et al. 2009). However, when holding (e.g., during the day), juvenile salmonids could also occur on the inside of river bends, as illustrated at Clarksburg Bend (Figure clark3).