Lees Ferry Fish Monitoring. Lees Ferry Monitoring. How do Glen Canyon Dam operations influence the rainbow trout fishery?. Annual sampling Electrofishing Abundance, Size Angler Surveys Catch rates. Mean peak discharge = 18,823 ± 2,518 cfs Mean discharge = 12,816 ± 683 cfs.
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Modified low fluctuating flows
Rainbow trout <152 mm
High Angler Catch Rate
6-fold decrease in CPUE from RM 58 63