1948 Person Aug 23 Left 9:30 am. with Jennifer, Worman, auntie Pearson, and Katherine Fligg for Calaveras Dam (Alameda Co.). Arrived down 11:30. Hot and sunny, water level of reservoir low. Mr. Macarthy let us into the large (20ft. diam. +/-) concrete inspection tunnel and the smaller pipe tunnel on--the both--which run into dam. Much grass near entrance of larger but no bats seen in either. also much grass in the tunnel where the pipe enters hill below --4 mile below dam, but no bats infest 100 yds of this tunnel. Many droppings around edge of tile roofed aerating bldg., but saw only one bat under the tiles, probably Myotis, but couldn't poke it out. Macarthy makes weekly inspections in the first two tunnels and doesn't see bats there ordinarily. He does see them flying around the mouth of the tunnel "about 7 or 8 o'clock." Saw a doe and large fawn in the swampy place below the dam, and occasional ground squirrels along road between Milpitas and the dam. also "" at the dam. Stopped at 3 wooden bridges and a few abandoned houses on way home, but no bats. Home 5 p.m.