. Evaluation of salmonflies in Montana's rivers : are statewide populations really declining?. Aquatic insects; Aquatic habitats; Flies; Insect populations; Salmonfly. Madison River The Madison's June/July hatch of salmonflies is legendary and a major fishing event in the west (Madison River Fishing Co. website). Runoff flows typically last from late May through June, and the adult salmonflies begin to emerge around July 1 in the channels just above Ennis, and the hatch works its way upstream for the next three weeks. "Fly fishers from across the nation converge on the Madison in the hope
. Evaluation of salmonflies in Montana's rivers : are statewide populations really declining?. Aquatic insects; Aquatic habitats; Flies; Insect populations; Salmonfly. Madison River The Madison's June/July hatch of salmonflies is legendary and a major fishing event in the west (Madison River Fishing Co. website). Runoff flows typically last from late May through June, and the adult salmonflies begin to emerge around July 1 in the channels just above Ennis, and the hatch works its way upstream for the next three weeks. "Fly fishers from across the nation converge on the Madison in the hopes of catching many and large fish on the big dry salmonfly patterns" (MRFC website). MT DEQ maintains data for one macroinvertebrate monitoring site located downstream on the Madison River near Interstate 90 which has recorded no salmonflies. Pteronarcys califomica abundance was reported at 3 sites in the Madison River in 1989-90 (Hauer et al. 1991) (Figure 6). PPL Montana (formerly Montana Power) has been sampling macroinvertebrates since 1997 in 7 locations on the Madison River between Hebgan Lake to the town of Ennis and downstream to the Greycliff FAS. For the upper portion of the Madison River PPL monitoring section, "Salmonflies have been, and remain Densities averaged greater than 20 individuals per square meter at all sites (below Hebgen Dam, below Quake Lake, Kirby, Varney Bridge and Ennis). No temporal trends were evident" (Dan McGuire, pers. comm.). Salmonflies are less abundant in the lower Madison River. Both the distribution and density appears to have declined in recent years (Figure 6). Densities were relatively high below the Bear Trap Canyon (Norris Bridge and Blacks Ford) Figure 6. Salmonfly densities in three reaches of the lower Madison River. 40 35 30 25 a. (D £ 3 20 15 10 -â¦âMadison PH/ Beartrap -â â BlacksFord/ Norris A Greycliff/ Three Forks Large Data Gap 1978-1988 Large Data Gap 1991-1996 -1 1 1-. 12. Please note t
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