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US Fish and Wildlife Service Hydrologist Craig Anderson, left, and California Department of Fish and Wildlife Scientific Aid Shawn Cox wade across the water with test equipment on the American River near River Bend Park in Rancho Cordova on Friday, January 17, 2014. Dams upstream keep gravel from naturally washing downstream, so - as part of a large project - 6,000 tons of gravel were added to the river bed to provide a better habitat for spawning chinook salmon. Recently, low water levels have left some of the salmon nesting areas (called redds) have been left high and dry. Today, biologists surveyed the American River to try to learn how many salmon eggs have been killed by low water levels. They sampled salmon redds (nests) for water quality, and the permeability of the river bed.