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 (66.6°F) and time of year, the following insects are active or expected on the AuSable River.
| Hatch | Latin | Top Patterns | Time of Day |
|---|---|---|---|
| Sulphur | Ephemerella dorothea / invaria | Sulphur Comparadun #14, Sulphur Parachute #14 | evening |
| Light Cahill | Stenacron interpunctatum | Light Cahill #14, Cream Comparadun #14 | evening |
| Hexagenia (Hex) | Hexagenia limbata | Hex Wiggle Nymph #4, Extended Body Hex Dun #4 | night |
| Terrestrials | Beetles, ants, hoppers, crickets | Foam Beetle #12, Chernobyl Ant #10 | afternoon |