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<br />.' <br /> <br />)2 <br /> <br />Phenolphthalein and meth3'l orange alkalinity <br />Phenolphthalein alkalinity ranged trom 0 ppm at all stations <br />to 10 ppm at the Green and Yampa stations at Echo Park (Table 4). <br />Averages varied trom :3 ppm at Island Park to 7 ppm at the Green and <br />Yampa stations in Eoho Park. l'lethyl orange values ranged trom 121 ppm <br />on the Green River at Echo Park to 165 ppm at Gates of Lodore. <br />Averages varied trom 1)1 ppm on the Yampa River to 161 ppm at Gates of <br />Lodore. Total alkalinity has little direot effect on fishes; however, <br />it is uSIlally an indicator of biologioal produotivity (Lagler, 1956). <br />All values recorded lie between the expected range of values for North <br />Amerioan tresh waters (Ellis, Westfall and EJ.lis, 1946). <br /> <br /> <br /> <br />