Abstract Streams of mountain watersheds In Wyoming were monitored to compare water quality data collected during 1971-72 with data collected during 1992. After 10 years there was little change in: (1) total coliforms, (2) fecal coliforms, (3) fecal streptococci, (4) plate counts at 35° C, (5) total heterotrophic aerobic bacteria, (6) denitrifying bacteria, and (7) those organisms capable of reducing sulfate. Grazing management, recreation activities, and wildlife use of the watershed studied seem to be contributing a constant bacterial load to streams sampled by year and month during summer.
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