Grand River elevated as Great Lakes smallmouth approach peak prespawn

What's Biting

What's Next

**Flow and River Conditions**

With the Grand River at 3,870 cfs (USGS gauge 04119000), anglers working the lower Grand should focus on current breaks — wing dams, inside bends, and tributary mouths where pre-spawn smallmouth hold out of the main push. If flows moderate over the next several days — typical as late-May snowmelt tapers across southwest Michigan — river clarity should tick up and nearshore boat-launch access will improve. Watch for that clarity transition; it often triggers a concentrated feeding window as fish that have been pushed into slack water move back onto gravel and cobble runs.

**Smallmouth Window**

Tactical Bassin's Great Lakes clear-water smallmouth breakdown identifies the prespawn period — which aligns with mid-May on most Michigan lakes and bays — as one of the fastest windows of the year to locate fish. Their framework calls for covering water aggressively: swimbaits, underspin rigs, and bladed jigs worked across emerging weed edges and rocky points tend to draw reaction strikes before fish commit to beds. On river stretches, current edges and deep pool tailouts are worth a methodical pass with a drop-shot or finesse swimbait. The waxing crescent is a mild positive — first light and last light windows frequently outproduce the midday hours this time of year.

**Walleye and Perch**

Post-spawn walleye on Lake Michigan and Lake Huron nearshore structure typically scatter toward transitional depths as May progresses. Vertical jigging along the first significant depth break, or slow-rolling a live shiner rig, is the standard approach for anglers targeting recovering fish. Yellow perch tend to bunch on gravel and sandy bottom adjacent to walleye corridors — a bottom-bouncer rig with a live minnow accounts for most keeper fish at this stage of the season. Check current DNR regulations before harvesting perch.

**Great Lakes Safety**

Outdoor Hub recently covered a Saginaw Bay capsizing that claimed three lives — a serious reminder that open Great Lakes water can turn dangerous with little warning in May. Verify NOAA marine forecasts before any offshore run, file a float plan, and wear your life jacket from the dock.

Context

Mid-May is one of Michigan's most dynamic fishing transitions. Steelhead runs on the Grand River and other Lake Michigan tributaries typically peak in late March and April; by the third week of May the main push is largely concluded, and the fishery shifts toward resident smallmouth bass and recovering walleye as surface temperatures warm toward the upper 50s and lower 60s Fahrenheit.

The Grand River's current reading of 3,870 cfs fits the pattern telegraphed earlier this season. The MI DNR Weekly Fishing Report from mid-April noted severe flooding across many Michigan river corridors as combined snowmelt and rainfall peaked simultaneously. A flow at this level heading into the third week of May suggests spring runoff is still unwinding — but trending in the right direction. Historically this gauge tends to settle into a lower, more fishable range by early June, which opens up more of the river's productive wade and boat-launch access points.

For Great Lakes nearshore fishing, May is traditionally the prime month for smallmouth bass ahead of the spawn. Tactical Bassin's observations about schooled, fast-moving fish align with what Michigan anglers typically report during this window — fish are aggressive, covering large stretches of shoreline and congregating on rocky transitions before water temperatures push them shallower to bed. Whether this year's spawn is running early or late relative to the long-term average is difficult to confirm without current temperature data, but the behavioral signals are consistent with typical mid-May Great Lakes timing.

No multi-year comparative flow or temperature benchmarks were available from the current data feeds to place this season's numbers in deeper historical context. If the DNR's weekly temperature map shows nearshore readings already in the upper 50s, expect the smallmouth spawn to begin within the next two to three weeks.