South Branch Au Sable River

Roscommon County, Michigan

Class I

South Branch Au Sable River is a Class I (self-sustaining wild trout) trout stream in Roscommon County, Michigan. Approximately 19.4 miles of classified trout water. Species include brook trout, brown trout, lake trout, rainbow trout, splake.

Stream Classification

Class I — Self-sustaining wild trout population

19.4

Miles

5

Fish Species

0

Access Points

6

Local Guides

Regulations

5 fish, with no more than 3 trout 15“ or greater. Zero (0) Arctic Grayling.; Tackle: Artificial lures and all types of natural bait may be used.; Season: Last Saturday in April through September 30th

Map & Directions

Fish Species

Species found in South Branch Au Sable River.

Brook trout Brown trout Lake trout Rainbow trout Splake

Fishing Guides Near South Branch Au Sable River

Wolf Pack Guide Service

Fly Fishing Guide

Big River Outfitters

Fly Fishing Guide

Bass Action Charters

Fly Fishing Guide

Due North Guide Service

Fly Fishing Guide

Northern Michigan smallmouth

Casey Richarson

Fly Fishing Guide

Cast Away Guide Service

Fly Fishing Guide

Lakes in Roscommon County

Barney Lake

Headquarters Lake

Houghton Lake

Lost Lake (south)

Other Trout Streams in Roscommon County

Asum Creek

Backus Creek

Class I 11.6 mi

Big Creek

Class I 39.3 mi

East Branch Wolf Creek

Muma Creek

Pup Creek

Plan Your Trip to South Branch Au Sable River

Weather forecast — check conditions before you go
Review Michigan trout stream regulations for season dates and limits
A Michigan fishing license is required — buy online

Data sourced from Michigan DNR Division of Fish and Wildlife. Last verified: April 1, 2026. Learn how we maintain this data.