WadeNot advised
Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
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Fly fishing report · Midwest
Au Sable River
An Au Sable River report for Michigan trout water, RiverReports flow context, dry-fly hatches, streamer tactics, access, rules, and weather.
Check flow & weatherToday's fishing decisionMost live data available
54
Use caution
Au Sable River is a cautious call right now.
Current USGS flow is 866 cfs and has been stable for about 6 hours. Today's flow is above the usual high-water marker for this date; the seasonal median is 615 cfs. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.
Best supported approachFloat
Watch nextFlow: Current USGS flow is 866 cfs and has been stable for about 6 hours. Today's flow is above the usual high-water marker for this date; the seasonal median is 615 cfs.
Updated Aug 3, 12:45 AM UTCUsually refreshes about every 45 minutes
Best supported approachFloat
Compare wading, bank fishing, and floating before choosing how you will fish.
Bank / edgeNeed data
This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.
Float · Best fit58/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Check before you drive
Current flow and weather.
Look at whether the river is rising or falling, then check wind, rain, and storms. These can change both safety and fishing.
Loading current flow and weather.
Before you rely on this report
How current is this report?
Conditions can change quickly. Check these dates before you decide to fish, and open the official source when safety or rules matter.
- River conditions
- Checked Aug 2, 2026, 8:45 PM
- Fishing guidance
- Reviewed May 31, 2026
- Public access
- No reviewed map pin available
- Rules and closures
- Official rule links checked
High confidence in the current score inputs.
7 sources are listed below for you to open.
3 public access records are listed. Private spots are never shown.
Source checked Jul 30, 2026
Plan your access
Know where you can enter.
These are public parking, launch, trail, or recreation areas—not secret fishing spots. We never show an angler's private pins, notes, or photos here.
- 0
- Shown on map
- 3
- No map pin
Location checkedDescription only
01No map pin
Area description
Grayling and Holy Water context
Classic upper/mainstream fly-fishing planning with exact rules to verify.
Restrictions and seasonal notes
Much of the fishing culture is public, but not every bank is public. Confirm access before walking long banks.
Boats and wade anglers share water. Give anchored or working anglers space.
02No map pin
Boat launch
Mio and Red Oak main branch
Useful main-stem flow context and broader boat/wade planning.
Restrictions and seasonal notes
Much of the fishing culture is public, but not every bank is public. Confirm access before walking long banks.
Boats and wade anglers share water. Give anchored or working anglers space.
03No map pin
Boat launch
Huron-Manistee public access sites
Use official access and boat-launch information rather than informal bank cuts.
Restrictions and seasonal notes
Much of the fishing culture is public, but not every bank is public. Confirm access before walking long banks.
Boats and wade anglers share water. Give anchored or working anglers space.
How to fish it
Match the reach to the hatch and the rule.
The Au Sable is a famous Michigan trout river, but it is not one uniform report. Pick the branch or main-stem reach, confirm the trout rule, and use the flow trend before planning dries, streamers, or night fishing.
- Use RiverReports and USGS Red Oak flow as broad main-branch context.
- Check Michigan's Inland Trout and Salmon map before fishing a special reach.
- Spring mayflies, June drakes, summer terrestrials, and fall streamers all have different setups.
- Night fishing can be productive, but only with safe wading, legal access, and a clear exit plan.
Why the score looks this way
FlowLowers score
USGS shows 866 cfs with a stable over about 6 hours trend. Today's flow is above the usual high-water marker for this date; the seasonal median is 615 cfs. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.
Best mode nowUse caution
Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
SeasonHelps score
Summer: Terrestrials and night fishing can work, but temperature checks are mandatory.
WeatherHelps score
The NWS forecast is about 68F with Mostly Clear.
Public alertsHelps score
No active NWS alert was returned for this forecast point.
Read the water
What changes the plan.
The Au Sable can be excellent when flows are stable and water stays cold. If it is hot, bright, or crowded, fish early, late, or choose shaded water with trout-safe temperatures.
Stable trout flow
Fish dries, soft hackles, and nymphs through riffles, flats, and bank edges.
Low clear water
Use long leaders, softer casts, and low-light windows.
Stained or rising
Streamers and bank work can improve, but skip unsafe wading.
Warm spell
Carry a thermometer and stop targeting trout when water is too warm for safe release.
Your trip plan
Know when to go—and when to skip it.
Best flows
Use the RiverReports Main Branch chart and USGS 04136000 near Red Oak together. Stable flows support dry-fly and wade planning; sudden rain bumps, warm water, or poor clarity should shift the plan toward safer banks, colder windows, or a different reach.
When to skip
Skip or change reaches when Michigan trout-map rules are unclear, when warm water would stress trout, when night-fishing safety is poor, when access sites are too crowded for good etiquette, or when high water makes wading or boat control unsafe.
Local plan
Start by choosing the style: Grayling and Holy Water dry-fly focus, Mio and main-branch float context, Red Oak flow checks, or a streamer day after rain. Match flies and timing to that reach instead of treating the Au Sable as one generic river.
Backup water
If the Au Sable is warm, crowded, rule-sensitive, or off-color, compare the Boardman River, Pere Marquette River, or Little Manistee River after checking current rules, flows, and access.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
April to MayBlack stones, Hendricksons, BWOs, early caddisBlack stonefly nymph, Hendrickson, BWO emerger, caddis pupa
Fly family · report suggests “Black stonefly nymph”Black Stonefly PatternsBlack stonefly wording is a color and insect-group label, not one exact recipe. Size, nymph versus adult stage, wing profile, and weighting must remain explicit.See family guide ↗
Fly family · report suggests “Hendrickson”Hendrickson PatternsHendrickson is a hatch name. Nymphs and emergers, upright or low-riding duns, and rusty spent spinners are different fly jobs.See family guide ↗+ 2 more reviewed guides in the Fly Box Late May to JuneSulphurs, March Browns, Brown Drakes, caddisSulphur comparadun, March Brown, Brown Drake spinner, elk hair caddis
Fly pattern · report suggests “Sulphur comparadun”Sulphur ComparadunThe fan-shaped upright deer-hair wing, split tail, low hackleless body, and Sulphur-specific color define this destination. A PMD Comparadun is related but not interchangeable by name.See photos & how to fish it ↗
Fly family · report suggests “March Brown”March Brown Dry FliesThis family includes traditional hackled, parachute, and Comparadun-style March Brown dries. Each exact construction rides differently and should be named when known.See family guide ↗+ 2 more reviewed guides in the Fly Box June to AugustIsonychia, caddis, terrestrials, night brownsIsonychia, Stimulator, foam ant, beetle, mouse, small streamer
Fly family · report suggests “Isonychia”Isonychia and Mahogany Dun PatternsIsonychia nymphs are active swimmers; emergers, parachute or other dry forms, and spinners occupy different levels. Mahogany Dun can be regional hatch wording, so it does not identify one exact fly recipe.See family guide ↗
Fly pattern · report suggests “Stimulator”StimulatorLook for a hair tail, dubbed abdomen with palmered hackle, tented hair wing, contrasting front hackle, and bright thorax or head. Colors and sizes vary widely and must remain labeled.See photos & how to fish it ↗+ 4 more reviewed guides in the Fly Box September to NovemberBWOs, October caddis, salmon and steelhead movementBWO dry, October caddis, stonefly nymph, egg only where legal, leech
Fly family · report suggests “BWO dry”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide ↗
Fly family · report suggests “October caddis”October Caddis PatternsOctober Caddis names a hatch group. Amber or orange pupae, soft-hackle or wet forms, and large tent-wing adults fish at different levels.See family guide ↗+ 3 more reviewed guides in the Fly Box 01
Choose a specific reach before choosing a fly; the Au Sable changes quickly by branch and public access point.
02
In hatch windows, watch for spinner falls and bank feeders before blind casting.
03
Fish streamers near wood, undercut banks, and stained edges after rain or in fall.
04
For night fishing, scout the exit in daylight and keep wading simple.
05
During summer, take water temperature seriously and move to bass water if trout are stressed.
Rules & closures
Check the official rules before you go.
Open the agency page to confirm the exact river section, species, season, tackle rules, limits, and emergency closures.
Official links checkedRules for this river or sectionNo special rule found
We did not find a special rule for this river.
We checked the state source but did not find a clearly supported exception for this river. Check the official rules for the exact section you plan to fish.
Rules checkedJul 30, 2026
Report a correction ↗Always follow the official rule
This summary helps with trip planning. The linked agency rule is the one you must follow.
Updates from anglers
What anglers are seeing.
Recent observations from general areas of Au Sable River. We review every update before it appears and never publish exact fishing spots, private access details, or photo locations.
Angler updates are not loading right now.
You can still use the river plan above. Check back later for recent observations from other anglers.
Where this report comes from
Open the sources we checked.
Fishing guidance checked: May 31, 2026
Site check: Jul 14, 2026. We regularly test report links, live scores, flow and weather data, and page loading. The content date changes only when the fishing guidance or its sources change.
Common questions
Before you leave.
What should I check first before fishing the Au Sable River?+
Check the Red Oak flow, Michigan trout map, weather, and water temperature before picking a reach.
Are there special regulations on the Au Sable River?+
Yes. The system has reach-specific trout rules, so check the Michigan Inland Trout and Salmon map directly.
Is the Au Sable River a good fly-fishing river?+
Yes, but only if you match the reach, season, water temperature, and target species. This page separates trout, migratory, and warmwater plans where that matters.
What flies should I bring for the Au Sable River?+
Bring the hatch-chart flies, a few confidence nymphs, and a backup streamer or warmwater box so you can adjust to flow, clarity, and temperature.
How should I plan access for the Au Sable River?+
Access is good in many places, but private banks, boats, and special reaches make planning important.