ABSTRACTRegression relationships were developed between summer mean total phosphorus (P) concentrations in near‐surface water and both chlorophyllaconcentrations and Secchi disc transparency for Puget Sound region lakes. Total P concentrations in the lakes studied ranged from 7 to 66 μ/L. The relationship between total P and chlorophylla, based on data from 69 lakes, explained 57 percent of the variance in chlorophylla. Predicted chlorophyllaconcentrations and 95 percent confidence intervals ranged from 1+3‐0.5μg/L for 7 μg/L P to about+35‐10μ/L for 66 μ/L P. The relationship between total P and Secchi disc, based on data from 71 lakes, explained 53 percent of the variance in Secchi disc. Predicted Secchi disc transparencies and 95 percent confidence intervals ranged from 5.5+5.5‐3.0m for 7 μ/L P to 1.4+1.5‐0.
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