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The EIR for the existing quarry states that common reptiles and amphibians in this part of the county include sand lizards, grass snakes, salamanders, and freshwater frogs (San Joaquin County, 1974). Common avian species observed during the site visit include California quail, mourning dove, common yellowthroat, yellow billed mockingbird, red winged blackbird, red headed woodpecker, common raven, song sparrow, robin, duck, scrub jay, yellow warbler, meadow lark, common snipe, and cliff swallow. Emergent Freshwater Marsh areas provide habitat for snowy egret and great blue heron, which were also observed during the survey. Raptors observed during the site visit include red-tailed hawk, turkey vulture, and black shouldered kite. Black tailed deer, California ground squirrel, gopher, striped skunk, cottontail, and evidence of raccoon (i.e. tracks in the mud) and beaver (i.e. trees with beaver marks) have been observed in the study area (San Joaquin County, 1974). A complete list of species expected (based on a knowledge of habitat type and vegetation in the area, as well as existing literature) and observed during field surveys of the study area is provided in Table 3.3-2. Aquatic Resources and Fisheries The Mokelumne River flows west from the Sierra Nevada mountain range toward the Central Valley . Through the study area, the river has an average channel width of 90 feet and an average depth of 12-18 inches, although its volume and velocity is controlled up-river by the release of water from Camanche Reservoir. The river is a freshwater body capable of supporting a fishery of freshwater species such as bass, steelhead, salmon, carp, sunfish, bluegill, catfish, and crape (Minch, J., pers. comm.). Wetlands Along the north side of the river, low lying freshwater marshes occur adjacent the river channel near and to the east of the proposed bridge crossing. The marsh areas appear to be a result of past quarry excavations. N1'etland plant species such as cattails, 45