Concentrations of mercury in milligrams per kilogram (mg/kg) wet weight in 
walleye fillet tissue from the upper and lower reaches of Lake Roosevelt from
the 1994 and 1998 USGS studies.						
[cm, centimeters; mg/kg, milligrams per kilogram; ww, wet weight; Upper, 
between Northport and Kettle Falls; Lower, between Spokane River and Grand 
Coulee Dam]						


         1994 USGS study                      1998 USGS study
             Length     Mercury                   Length      Mercury
   Reach      (cm)    (mg/kg, ww)       Reach      (cm)     (mg/kg, ww)

   Upper      36.2        0.14          Upper      36.0        0.12
   Upper      34.7        0.16          Upper      35.0        0.10
   Upper      37.4        0.20          Upper      33.5        0.11
   Upper      34.3        0.15          Upper      36.0        0.10
   Upper      34.3        0.22          Upper      36.0        0.11
   Upper      40.4        0.30          Upper      33.5        0.12
   Upper      38.1        0.16          Upper      35.0        0.12
   Upper      36.5        0.18          Upper      34.5        0.12
   Lower      34.1        0.31          Lower      36.0        0.13
   Lower      35.6        0.21          Lower      34.0        0.16
   Lower      34.5        0.24          Lower      36.5        0.12
   Lower      36.2        0.26          Lower      37.5        0.15
   Lower      35.8        0.18          Lower      40.5        0.19
   Lower      35.1        0.28          Lower      39.5        0.22
   Lower      34.6        0.27          Lower      41.0        0.18
   Lower      36.6        0.30          Lower      35.5        0.10