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along the lake shores. Vegetation patterns are strongly associated with topographic features of the property. The frequently dry lakebeds are edged by a narrow and broken band of willows, oaks, buttonbush and cottonwoods. Two distinct types of vegetation are associated with the river. The immediate channel and banks of the Mokelumne River support buttonbush, willows, cottonwood, with an occasional oak situated midslope. The immediate floodplain, the terrace that is most frequently flooded during high flow, is densely forested with interior live oak and valley oak. Contour lines are missing within the forest on the Lodi North 7.5 minute U.S.G.S. (U.S. Geological Survey) topographic map (Map 2). However, there is substantial relief in the forest, usually over a range of several feet where sediment has been deposited or washed out during floods. Several deep oxbows and smaller drainage channels lie within the forest. The higher ground away from the lakes and river is less frequently flooded. These areas are characterized by annual grasslands and an oak-buckeye savanna underlain by annual grasslands. Shallow depressions which typically develop over a hardpan,occur throughout the savannas and grasslands and support several vernal pool species. The depressions are rarely over 18 inches deep. Topography also influences the locations for building sites. San Joaquin County Department of Flood Control prohibits residential construction within the 100 year flood plain, which corresponds to an elevation of 29 feet at the ranch. Finish floor elevations must be constructed at elevations greater than 30 feet above sea level. 2.2 Climate The prevailing climate of Buckeye Ranch follows a Mediterranean type pattern of a short period of winter rainfall followed by a longer period of summer drought. The following averages for Buckeye Ranch are based on measurements taken at the Stockton WSO (the Buckeye Ranch Resource Plan (November, 1993) 22