Freestone · Sand Gravel · Michigan

Au Sable River

Au Sable River venue image
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The Au Sable is two rivers in one: the upper 'Holy Water' is a hallowed resident brown-trout flies-only stretch, hatch-rich and technical, while the lower river below Foote Dam gets Lake Huron steelhead and a fall salmon run.

Species

About as good as it gets

Low and clear — careful approach country. Take your time — read the water before you cast.

75% confidence in this read
Water temperature for brown trout
Ideal
15°C est.ideal 1016°C
0°14°28°
Why this score · for brown trout
  • Temperature10028% weight
  • Flow8022% weight
  • Clarity9518% weight
  • Feeding Time5013% weight
  • Pressure807% weight
  • Insect activity7012% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
15.0°C
Estimated
Clarity
Clear
Air temp
26°C
Wind
NE 16 km/h
Gentle breeze
Pressure
1021 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
18.7 mm
Moderate rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

How to fish it · for brown trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Excellent — water temperature is right today, though time of day could be better.
Local fly shopsGates Au Sable Lodge
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Permits & access
Permit required — see local rules.
  • Michigan licence
  • The upper Holy Water is flies-only, no-kill — verify MI DNR rules by reach
  • Lower-river runs are an introduced, harvestable sport fishery.
Directions
About this water

The Au Sable is two rivers in one: the upper 'Holy Water' is a hallowed resident brown-trout flies-only stretch, hatch-rich and technical, while the lower river below Foote Dam gets Lake Huron steelhead and a fall salmon run. The birthplace of Trout Unlimited, and it fishes like a place that earned the name.

Under the surface

The Au Sable's Holy Water is exactly that to a Michigan trout angler — the special-regulation water below Grayling where Trout Unlimited was founded in 1959, on the banks of a river worth founding it for. It runs through the jack pine and cedar of northern Michigan as a clear, cold, spring-fed river of remarkable evenness — the sand-country geology gives it a steady flow and a steady temperature, and the wild browns and brook trout rise to its famous hatches with reassuring regularity. The bed is sand and gravel, the water tea-stained and gentle, the banks lined with cedar sweepers and the long-tailed Au Sable riverboat drifting through. The current is mild, the gradient soft. Wading is easy on firm gravel, with soft sandy pockets to mind. This is classic, civilized, deeply loved eastern trout water — the kind of river you measure other rivers against, and a few of them come up short.

Wading: Soft sandy pockets among the gravel

  • Sand gravel
  • Unconfined
  • Pool riffle
Other water nearby · 1