Page 

 Table Title 



13 Bottom Organisms, March I961 52 



lU Bottom Organisms, April I96I 53 



15 Bottom Organisms, May I96I 55 



16 Bottom Organisms, Jiine 1961 57 



17 Nianbers of Bottom Orgfiuaisms at Selected Stations 63 



LIST OF FIGURES 

 Figvire Title 



1 Biological Survey - Physical Data, April 196O, May I960. . I6 



2 Biological Survey - Physical Data, June 1960, July I96O. . 17 



3 Biological Survey - Physical Data, August I96O, 



September I960 I8 



^4- Biological Survey - Physical Data, October I96O, 



November I96O 19 



5 Biological Survey - Physical Data, December I960, 



January I961 20 



6 Biological Swrvey - Physical Data, February I961 



March I96I . . . 21 



7 Biological Svorvey - Physical Data, April I96I, May I961. . 22 



8 Biological Sxirvey - Physical Data, Jwae I961 23 



9 Dissolved OjQrgen and Water Temperature at Selected 



Stations River Mile 15O to 305.7 2l+ 



10 Dissolved Oxygen emd Water Temperatxire at Selected 



Stations River Mile to 150 25 



U Ranges of Dissolved Oxygen Concentrations 



in Riffle Areas 26 



12 Secchi Disc Readings - Sacramento River, I96O-61 28 



13 Gravel Size Distribution at Selected Riffle Stations ... 29 



Ik Bottom Particle Size Distribution at Selected 



Non-Riffle Stations 30 



15 Nunibers, Diversity and Volumes of Aquatic Organisms ... 60 



-iv- 



