What flies are hatching on the Au Sable South Branch right now?

Current and seasonal hatches on the Au Sable South Branch include Blue-Winged Olive. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Au Sable South Branch?

The Au Sable South Branch is running at 220 CFS at the South Branch Au Sable near Luzerne, MI gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Au Sable South Branch fishable today?

Yes — Au Sable South Branch is rated fishable right now. Current flow is 220 CFS at the South Branch Au Sable near Luzerne, MI gauge.

Au Sable South Branch Fly Fishing Conditions

Live Conditions

Au Sable South Branch — South Branch Au Sable near Luzerne, MI

Fishable

220CFS

Discharge

4.93ft

Gauge Height

46.0°F

Water Temp

Updated 58 min agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

29.11 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

37°FClear sky

Wind 6 mph29.11 inHg Low & stable

Tough conditions — fish deep

Today

☀️

Clear sky

54° / 30°

Tomorrow

☀️

Clear sky

57° / 37°

Mon

☁️

Overcast

61° / 37°

Tue

☁️

Overcast

64° / 44°

Cold front incoming — go deep with nymphs, surface activity likely slow.

Weather by Open-Meteo · No API key · Updated every 30 min

What should I fish today?

⚡ AI

AI-powered recommendation using today's live flow, temperature, and hatch data.

8.6

Time of Day

Using: 220 CFS · 46°F · BWOs

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Au Sable South Branch conditions.

🪰 Hatch Calendar

Au Sable South Branch · October · Fall

Full calendar →

🟢 Active now at 46°F water

Blue-Winged Olive

Select month

JanDec

BWOs (size 18-20). Brown trout spawning beginning — RESPECT REDDS. Most sections close September 30.

Blue-Winged Olive

🟢 Active · 🟡 Approaching · ⚪ Seasonal only

River Map

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USGS Gauge (click for site ID)Fishing Access / SectionScroll to zoom disabled — use map controls

About Au Sable South Branch

The South Branch of the Au Sable flows through the Oscoda County State Forest in a deep, remote valley. Wild brown and brook trout inhabit its cold, clear water. The Chase Bridge area is a classic access point. The South Branch carries the Hex hatch and excellent caddis action through the summer months.

Blue-Winged OliveHendricksonSulphurCaddisHexageniaLight CahillTrico

Regulations

Gear Restricted sections present. Verify Crawford/Roscommon County exceptions in current Michigan DNR Inland Trout & Salmon Regulation Guide. Michigan Fishing License required. Season opens last Saturday of April.

Learn More

Guides to help you fish Au Sable South Branch with more confidence.