Michigan smallmouth swimbait bite heats up in mid-June Great Lakes swing

What's Biting

What's Next

The new moon phase (June 16-17) concentrates feeding activity into shorter but intense windows around first light and last light. Plan to be on the water well before dawn and stay through the first 30 minutes of darkness when targeting smallmouth or walleye. As the lunar cycle builds toward the first quarter over the coming week, those feeding windows will gradually widen, giving you more productive time on the water through the weekend.

On the Grand River, USGS gauge 04119000 recorded 4,360 cfs on the evening of June 16 — elevated for mid-June but unlikely to shut fishing down if you read the current correctly. Target inside bends and current seams where walleye and smallmouth stack to intercept forage swept downstream. Wing dams, bridge pilings, and tributary confluences will concentrate fish when the main channel runs hard. If precipitation eases through late June, flows on the Grand typically drop into July, eventually opening productive wade-fishing windows in the shallower reaches upstream of Grand Rapids.

Smallmouth bass on the Great Lakes remain the headline opportunity into next week. Per Tactical Bassin, the one-two swimbait approach — a heavier paddle-tail like the Dark Sleeper to locate and fire up fish, followed by a finesse presentation like the Spark Shad to close the deal — has produced trophy bronzebacks even in blustery conditions. As water temperatures continue to climb through late June, topwater presentations will increasingly come into play during those low-light windows; walking baits and hollow-body frogs along rocky shorelines can draw explosive surface strikes once surface temps settle into the summer range.

As Fishing the Midwest notes, weedlines are a consistent early-summer target for mixed bass and walleye — identify the inside edge of healthy cabbage or milfoil beds and work them with jigs or swimbaits at first light. For open-water walleye in Great Lakes structure, trolling spinner-and-crawler harnesses over depth transitions is a reliable technique as the season progresses and fish push off their post-spawn shallows.

For river anglers on the Grand, the elevated flow calls for heavier tungsten jigs to stay pinned to the bottom through the current. Lighter presentations will sweep past holding fish too quickly. Any slack-water created by laydowns, boulder gardens, or tributary mouths is worth a methodical pick before moving on.

Context

Mid-June in Michigan typically marks the consolidation phase following spring spawning, when fish scattered across shallow habitat begin regrouping on early-summer structure. Smallmouth bass in Great Lakes waters generally finish spawning by late May to early June; males that guarded nests are actively feeding again by mid-month, making this one of the stronger trophy-smallmouth windows of the year. That timing aligns with what Tactical Bassin is currently reporting on the Great Lakes.

The 4,360 cfs reading on the Grand River is on the elevated side for mid-June, when the river more commonly trends in the 2,500-3,500 cfs range as the spring melt cycle winds down. Elevated June flows often reflect recent upstream rainfall rather than snowmelt, and the Grand typically drops gradually through the remainder of June and into July under normal conditions. As flows settle, wade-fishing access opens in the shallower upstream reaches and summer-pattern walleye and smallmouth become more predictable on their holding lies.

Water temperature data was not available at gauge 04119000 this week. In a typical mid-June year, surface temps in the Grand River and near-shore Great Lakes waters run from the upper 60s into the low 70s — a zone that supports active feeding across most warmwater species. Any sustained stretch above the mid-70s heading into July tends to push fish deeper and into current-cooled habitat, shifting tactics toward deeper structure presentations.

The MI DNR Weekly Fishing Report (most recent available: June 10) is the primary state-agency benchmark for Michigan conditions this week, though the full report body was not captured in our intel feed. The DNR's June coverage historically addresses conditions across all Michigan districts as the fishery transitions from spring runs to summer structure patterns, with walleye, perch, and bass typically headlining reports for both the Great Lakes and the Grand River drainage.