Salmon runs build offshore as walleye trolling heats up at Grand River

What's biting

What's next

With no fresh buoy or USGS gauge data feeding into this update, the near-term outlook leans on seasonal pattern rather than live readings — treat the next few days as typical mid-August Lake Michigan conditions until a new data pull comes in. Expect the offshore salmon fishery to keep producing on deeper trolling programs (spoons and flies worked well below the thermocline) while inshore action at the Grand River mouth stays a mixed bag until water temperatures cool into September and the first pushes of Chinook and coho start staging near the pierheads and river mouth.

Walleye should keep responding to the crawler-harness trolling pattern described on the Michigan Sportsman Forum — 25 feet of water at 1.6-1.8 mph is a solid starting point for anglers working the eastside structure this week, and Fishing the Midwest's notes on pairing Forward-Facing Sonar with harness rigs are worth leaning on if the bite is scattered rather than schooled tight.

Smallmouth bass fishing should hold steady through midweek, with the best windows concentrated around dawn and dusk per Wired 2 Fish's read on summer feeding behavior — packs of bass pushing baitfish to the surface in low light are the pattern to watch for on calm mornings and evenings. Midday should stay slower as fish slide deeper or tuck into shade and current breaks.

Plan around the new moon for reduced nighttime light, which can push some baitfish and predator activity later into dusk. Anglers heading out this weekend should verify local wind and wave forecasts directly, since no current buoy data was available to characterize Lake Michigan's nearshore chop — conditions on the open lake can shift quickly enough to matter more than any single-day forecast. Once fresh gauge and buoy readings come back online, expect this report to sharpen on exact water temperature and flow at the Grand River mouth, which will be the better signal for when the first real salmon push arrives inshore.

Context

August on Lake Michigan and at the Grand River mouth typically sits in a transitional stretch: the big salmon runs that define fall fishing at river mouths across the basin haven't arrived yet, and most Chinook, coho, and steelhead are still holding and feeding in open water before the seasonal push toward tributaries later in September and October. That matches what the data here suggests — no river-mouth salmon reports came through this week, consistent with typical timing rather than anything unusual.

The WI DNR's recap of the 2024 season (record coho harvest north of 210,000 fish, Chinook numbers at their highest since 2012) is useful context rather than a current-week signal — it points to a Lake Michigan salmon fishery that has been trending strong in recent years on the back of a healthier alewife forage base, which is generally a good sign heading into any given season, this one included.

Walleye and smallmouth bass are the more realistic near-term targets for Grand River mouth anglers in mid-August, and the single forum report of a walleye limit fits the season's typical summer trolling pattern rather than signaling anything unusual.

Honestly, there isn't enough direct current-week intel in this pull to say whether this August is running early, late, or on-schedule compared to prior years — no agency, shop, or charter source filed a fresh Grand River mouth report, and no buoy or gauge data came through. That's worth flagging plainly rather than guessing.