Stable Grand River flows set the table for walleye, bass, and offshore salmon

What's biting

What's next

With the Grand River holding at a stable 2,620 cfs and no buoy data indicating unusual lake surface conditions, the next several days at the river mouth are likely to be driven by biology more than hydrology. Late-June puts Lake Michigan squarely in the summer transition window: surface water on the main lake typically warms into the upper 60s°F and beyond, which pushes Chinook and coho off nearshore structure and down into the thermocline. Downrigger trollers and planer-board rigs working at 50 to 100 feet — targeting the cooler band where baitfish concentrate — are the primary path to open-lake salmon. Spoons, flasher-fly combos, and natural alewife-pattern body baits are traditional producers on this stretch of the lake.

For river-mouth anglers staying closer to shore, walleye present the clearest near-term opportunity. The Full Moon peaking this weekend can intensify low-light feeding bursts at dawn and dusk, particularly along the current seam where the Grand River meets the lake. Jig-and-crawler rigs or crankbaits worked in the current transition zone deserve early-morning and last-light attention. Night fishing from pier and jetty structure is also worth considering — walleye routinely push into pier-light zones under full-moon conditions, and late June's long days still provide genuine dark hours at the bookends.

Smallmouth bass in the river corridor and immediate mouth area typically spread out from post-spawn recovery through late June. Shallow rocky structure, current edges, and any remaining dock shade hold fish during peak midday heat. Topwater at first light and soft plastics worked deeper in the current column as the day warms are a reliable approach. Expect fish to key on slightly deeper current breaks as temperatures climb toward the holiday weekend.

Perch action on the 5–7-foot flats has not been confirmed by any charter, shop, or agency source this cycle. If the shallow-flat approach proves unproductive, step down to 10–15-foot structure where perch typically suspend in warmer months rather than holding in the shallowest zone. Plan around early-morning windows this weekend: holiday boat traffic on Lake Michigan builds sharply by mid-morning, and the pre-8 a.m. window typically offers both quieter water and the low-light feeding activity that benefits multiple target species.

Context

The late-June window at the Grand River mouth historically falls in the gap between two seasonal peaks: the spring run — which concentrates salmon and steelhead traffic from April through early June — and the late-summer Chinook staging period that typically builds toward the end of July. For anglers, this interstitial stretch is often underappreciated. Walleye, smallmouth bass, and perch form the accessible core of the fishery while the offshore salmon bite slides deep, and competition for water is lower than during the peak spring and fall pushes.

The WI DNR Lake Michigan Fishing Report's 2024 harvest data is the most recent comparative benchmark available in our feeds: record coho numbers exceeding 210,000 fish, and Chinook topping 160,000 — the lake's strongest Chinook haul since 2012 — attributed to improved alewife forage survival. Those fish are now maturing toward the 3–4-year age bracket and represent the primary offshore salmon stock accessible to Lake Michigan trollers this summer. Whether the 2026 season tracks comparably to that strong baseline is something the MI DNR typically quantifies through their weekly reports, but that resource was not accessible this cycle.

River flow at 2,620 cfs falls within the expected mid-summer range for the Grand River at Grand Rapids — not a scouring high-water event, not a stress-inducing low that would affect fish staging at the mouth. The gauge provides no water temperature reading for this date, and no NOAA buoy data was available for the nearshore zone. Late-June Grand River mouth temperatures historically run in the mid-to-upper 60s°F, which keeps walleye and bass comfortable but nudges salmonids toward the colder depths offshore. Anglers targeting species with specific thermal preferences should verify conditions on arrival, as actual thermocline depth will shape where offshore fish are holding day to day.