Chris Izworski reporting from Michigan on the current state of the AuSable, where summer heat has thinned the water and elevated flows are complicating what should be a prime August opportunity.

The Gauge Is Running Hot

The AuSable is running at 1030 cubic feet per second this morning, which puts it at 134 percent of the historical median for August 10. That’s the kind of number that makes you pause before loading the truck. The gauge height sits at 3.2 feet, well above the 75th percentile for this date. We’re in elevated water territory, and while the USGS data doesn’t show catastrophic rise, it’s enough to complicate fishing on a river that already demands precision in August.

The water temperature is 69.4 degrees, which is warmer than ideal but not yet crisis territory. Still, combine that warmth with elevated flows and you’re looking at a river that’s slightly out of phase with what August usually offers on the AuSable. This is fishable water, but not the glassy, technical water the Holy Water reach is known for.

Why Today Is Fair, Not Good

The Michigan Trout Report rating today is Fair, which means exactly what it says: you can fish, but you’ll need to be selective about where and when you do it. The elevated flows have broken up some of the precision current seams that make the AuSable special. Those tight lies are less defined, the fish are less concentrated, and the sipping rises that characterize August on this river are less frequent.

Weather today is cooperative enough. Mostly sunny, 82 degrees, virtually no wind. That’s dry-fly water, or it would be if the flows cooperated. But the rain outlook for the next 48 hours shows only a 19 percent maximum chance, and the NWS is calling for stable flow. This isn’t the beginning of a blowout. This is elevated summer baseflow, the kind that happens when there’s been recent rain or groundwater input upstream.

The Trico Window Is Your Play Today

If you decide the drive is worth it, you need to be on the water at first light. The Trico spinner fall on the AuSable in August starts in the early morning darkness and moves toward dawn, with the heaviest activity from first light to about 9 AM. This is when the fish concentrate and when your precision matters most. Bring 6X tippet minimum, 7X if you’re steady with a small rod. The patterns are familiar: CDC Trico Spinner in size 20, or a Trico Dun if you want something slightly more visible in dim light.

The key to morning Trico fishing is patience and single-fish focus. Pick a rising brown and stay with it. Long leader, drag-free drift, and the willingness to make ten good casts instead of a hundred mediocre ones. In elevated water, the fish aren’t as eager, which means you need to be even more deliberate.

After 9 AM, the Tricos fade and the day gets hot. Terrestrials come into play then, along with beetles and ants. Work the grassy banks and undercut sections with small foam beetles and Chernobyl Ants. But understand that midday fishing on the AuSable in August is always a grind. The water is clear, the sun is high, and the trout are somewhere in the deeper, slower water.

Evening Could Matter

The golden hour starts at 7:21 PM tonight and runs through sunset at 8:51 PM. If a White Fly emergence materializes, the evening could be strong. The AuSable is known for solid August White Fly hatches, and the forecast shows clear skies through tonight. Fish a White Wulff or White Comparadun in size 12-14 and watch for aggressive rises on the surface. The elevated water actually helps here: it creates more current variation and more aggressive feeding.

The Better Decision

Tuesday looks nearly identical to today, but Wednesday brings a 53 percent rain chance. That’s the day the flows will likely spike again. If you’re planning a drive from lower Michigan, Tuesday evening might be your window. The forecast shows 81 degrees, low 53, with only a 19 percent rain chance. That’s stable through Tuesday night.

Today is fishable if you’re committed to early morning Tricos and can afford to move slowly. But if you’re still undecided, Tuesday offers the same fish with slightly better odds and one more full day of stable flow in the window.

For live gauge data and real-time flow updates, check https://michigantroutreport.com.