levels shown by shoreline development are inferred to reflect still 

 more dilute water chemistry at times of higher throughflow. The 

 water quality of inflow received by Halfbreed Lake is probably 

 affected by saline seeps in the Cedar Creek drainage and by the 

 evaporative salinization of water stored upgradient in Hailstone 

 Reservoir. 



Sediments. Sediment concentrations of copper, boron, chromium, 

 nickel and zinc were found near at or near the upper end of their 

 ranges for hydrologically similar sample sites. Copper exceeded 

 mean soil values for the western U.S. by a factor of about 2; boron 

 by a factor of about 3, and nickel and zinc by factors of about 

 1.5. The chromium concentration was below the regional mean soil 

 concentration . 



