Salmon and Smallmouth Set Up as Grand River Mouth Enters Late-June Pattern

What's biting

What's next

With no current water temperature or streamflow data available for this cycle, planning around the calendar and First Quarter moon offers the most actionable framework for the June 23 week.

Late June is the opening act of west Michigan's trophy salmon season. Chinook typically move from deep holding zones toward the nearshore thermocline as alewives — their primary prey — concentrate in cooler mid-column water. Coho often run shallower during this period, making them accessible to anglers working within the first few miles offshore. Look for classic bait-ball signs: diving birds, nervous surface water, and clouds of bait on sonar in the 30–80 ft range off the river mouth.

The First Quarter moon on June 23 tends to activate feeding windows in the early morning and early evening. Plan launches at or before first light if targeting salmon — the bite often compresses into a 60–90 minute window around dawn before the sun pushes fish deeper. Spoons and flasher-fly combos are traditional Lake Michigan producers for this time of year.

For the Grand River mouth itself, walleye staging in the transition zone between river current and open lake water should be the focus after dark. Typical late-June patterns put fish working the deep edge of sand and gravel bars just inside the river mouth, with crawler harnesses or jigging rigs in 8–15 feet. Smallmouth bass, post-spawn and actively feeding, typically favor current seams, jetty structure, and accessible rock piles — tubes and drop-shot rigs are standard producers in this kind of transition water.

As temperatures build through the last week of June, watch for the thermocline to deepen. When that shift occurs, add lead on your downriggers to keep lures in the productive zone. Weekend anglers on June 28–29 should check the MI DNR Weekly Fishing Report for any updated charter intel before launching.

Context

Lake Michigan's Grand River mouth marks the heart of Michigan's western salmon corridor and one of the Great Lakes' most recognizable freshwater fishing destinations. Historically, late June signals the beginning of the lake's most productive Chinook window, which typically peaks through July and into early August as fish stage near river-mouth structure ahead of the fall run.

The WI DNR Lake Michigan Fishing Report's 2024 harvest data provides the most recent comparative backdrop: more than 210,000 coho salmon harvested lake-wide — a record — alongside 160,000-plus Chinook, the strongest showing since 2012. The WI DNR attributed that success to recent years' alewife classes boosting stocked fish survival across the lake. If those alewife classes have held into 2026, the summer salmon season could sustain that positive trajectory — but specific charter or angler reports from the Grand River mouth region were not available in this reporting cycle to confirm current conditions.

For typical late-June context at this location: the lower Grand River traditionally holds resident steelhead and smallmouth bass in its accessible reaches, while walleye concentrate near river-mouth sand flats in low-light conditions. Salmon fishing generally shifts offshore as surface temperatures climb through the season, requiring progressively deeper presentations through the thermocline.

No on-water comparison data for 2025 or the current 2026 season near the Grand River mouth was available from the sources accessed for this report. The absence of real-time buoy and gauge readings leaves the current thermal stratification and river flow — both key variables for fish positioning — unverified. Treat this report as a seasonal baseline and confirm with the MI DNR Weekly Fishing Report or a local tackle shop before committing to a trip plan.