Chris Izworski’s Michigan Trout Daily weekly overview for Sunday, September 13: here is what the gauges actually show across the state. September in Michigan is that rare sweet spot when summer’s heat finally breaks, water temperatures drop into the comfort zone for trout, and the crowds thin out on famous rivers. This week shows a mixed picture across the state, with some serious blowouts in the north and critical low flows in the UP that will reshape where you should fish.
The headline: Northern Lower Peninsula rivers are running hot, literally and figuratively. The Upper Peninsula is drying out in patches. Southern Lower Peninsula streams remain ungauged but should be manageable given the overall pattern. Brown trout are beginning to think about spawn, meaning they are holding tighter to structure and feeding with more purpose. This is not the time for lazy presentations.
Upper Peninsula: Drought Emerging in Pockets
The UP is showing stress. Of the 12 gauges still reporting, more than half are running dangerously low. The Black River in UP has dropped to 29 percent of median flow, making it marginal for wading and likely pushing trout into deeper pools. The Presque Isle River sits at 32 percent, and the Ford River at 34 percent. These are not fishable conditions for most anglers. Cedar River has cratered to 22 percent of median.
The picture improves slightly elsewhere. The Ontonagon River is holding at 82 percent of median, near normal for September. The Iron River runs at 107 percent, which is solid. Sturgeon River (Nahma) is at 70 percent, borderline, and the East Branch Salmon Trout River at 89 percent. Water temperatures are your friend here: the East Branch Salmon Trout River is the coldest gauge in the state at 54 degrees Fahrenheit, ideal for trout metabolism and fall feeding.
Twelve UP gauges are offline, which means you are working blind on significant stretches of water. Call ahead to local fly shops before committing to a drive into the UP this week. The Ontonagon and Iron River offer the most promise based on available data.
Northern Lower Peninsula: High Water and One Critical Blowout
This region is running wet. The Looking Glass River is blown completely out at 216 percent of median flow, making it unfishable. The Thornapple River is running high at 161 percent. The Red Cedar River sits at 170 percent. The Pine River (Oscoda area) is elevated at 141 percent. All three of these rivers will be carrying extra color and volume this week, suitable only for experienced high-water wading or two-handed spey work if you are equipped for it.
The better bets are the rivers near normal. The Platte River holds at 126 percent, manageable. The Rifle River is at 123 percent. The Pine River (not the Oscoda one; the other one) is at 94 percent of median, dead normal for September. The Sturgeon River in the NLP sits at 109 percent, still fishable with care. The Clam River at 88 percent of median is running slightly below normal but not problematic.
Water temperatures across the NLP range from 56 degrees on the Pine River (Oscoda) to 67 degrees on the Pigeon River in Ottawa County. The cooler rivers will fish better, particularly early and late in the day. September mayfly activity is limited to scattered caddis and occasional blue-winged olives on overcast afternoons, so nymphing and streamer work will outperform dry fly fishing most days. Seventeen gauges are offline in this region, so conditions on many fine streams remain unreported.
Southern Lower Peninsula: No Gauge Data Available
The southern half of the Lower Peninsula has no real-time flow gauges reporting to the Michigan Trout Report network. This region includes excellent streams and tailwaters where September conditions are typically favorable, but you will have to develop local knowledge through fly shops, recent reports on forums, or direct reconnaissance. Assume moderate conditions and fish accordingly until you have ground truth.
Where I Would Go This Week
I would target the Pine River (the one at 94 percent, not the Oscoda branch) in the Northern Lower Peninsula. Near-normal flows, cold enough water, and reduced pressure this time of year make it a strong September choice. If you are willing to drive to the UP and have time to call ahead, the Iron River at 107 percent of median and 54-degree water on the East Branch Salmon Trout River both deserve a trip; the East Branch is the coldest gauge in the state right now. Avoid the Looking Glass River, Black River (UP), Presque Isle River, and Ford River entirely this week. Avoid the high-water rivers (Thornapple, Red Cedar) unless you specialize in that style of fishing.
Brown trout are on the move into pre-spawn phases; fish will be more aggressive than they were in August, but also more selective. Size down your nymphs to 16 and 18, use longer tippets, and fish tight to structure. For full details on all 62 gauged Michigan trout rivers, visit https://michigantroutreport.com.