Holy Water stretch between Grayling and Mio. Premier wild trout fishery in the Midwest. Flies-only designated reaches, pristine spring-fed currents, legendary hatches. Home to Hex, Sulphur, and world-class rising brown trout.
Species present: Brown trout, Rainbow trout. Stream type: freestone.
Based on current water temperature (50.5°F) and time of year, the following insects are active or expected on the AuSable River.
| Hatch | Latin | Top Patterns | Time of Day |
|---|---|---|---|
| Midge | Chironomidae | Mercury Midge #20, Zebra Midge #20 | midday |
| Blue-Winged Olive (Baetis) | Baetis spp. | Parachute BWO #16, Sparkle Dun BWO #16 | midday |
| BWO (Fall) | Baetis tricaudatus | Parachute BWO #16, Pheasant Tail Nymph #16 | midday |
| Fall Caddis | Neophylax spp. | Orange Elk Hair Caddis #14, LaFontaine Pupa (orange) #14 | afternoon |