Post-spawn smallmouth heating up on Susquehanna and Allegheny

What's Biting

What's Next

With water at 74°F and flows at 5,470 cfs, the coming days look favorable for smallmouth bass and catfish across the Susquehanna and Allegheny. The Last Quarter moon brings reduced nighttime light — a window that typically dampens surface activity but favors bottom-feeding catfish, as big fish move more freely in low-light conditions.

Smallmouth are in the late post-spawn recovery phase characteristic of early June. As water temps inch toward and past 75°F over the next few days, expect fish to push slightly deeper — seeking cooler, oxygenated water near main-channel ledges and mid-river humps. Tactical Bassin recommends working offshore structure with a swinging jighead or shaky head worm, using the wind to drift outside flats and work key contact points. The chatterbait also stays in the mix as a reaction trigger for post-spawn fish that haven't fully settled into slow-presentation mode. Crankbaits dialed to the 6–10 foot zone along current breaks should produce as fish spread into established summer feeding lanes. Plan morning and evening windows to avoid mid-day heat lulls when surface temperatures peak.

For catfish, June warmth is a green light. Cut gizzard shad soaked along a slow-moving ledge in 17–23 feet is the proven method — exactly the setup that produced the 36.2-pound Delaware River flathead on June 1 (Wired 2 Fish), and the Susquehanna's main-channel edges offer identical structure. Target the 15–25 foot ledge zones on overnight and dawn runs when big flatheads move onto shallower feeding grounds under cover of dark. The darker moon phase this week is a structural advantage for overnight catfish trips.

Fishing the Midwest notes that river versatility is the summer edge — rotating among bass, catfish, and walleye as activity windows shift prevents dead time on the water. If bass go quiet mid-afternoon, drop to a bottom rig in a deeper bend and return to the smallmouth bite at last light.

At 5,470 cfs the Susquehanna is at a comfortable float level for kayak and canoe anglers, and most gravel-bar wade spots should be accessible. Confirm conditions locally before wading; flows can rise quickly after upstream rainfall.

Context

A water temperature of 74°F in the first week of June sits right on the historical curve for the lower Susquehanna. The river typically climbs from the mid-60s in late May into the upper 70s by mid-to-late June, placing this reading squarely on schedule — not running early, not running late. Flow at 5,470 cfs is moderate for this time of year; spring runoff generally recedes through May and June, and readings in the 4,000–7,000 cfs range at gauge 01540500 are common heading into the summer low-water period.

For smallmouth bass, early June is historically the most coveted window on the Susquehanna and Allegheny. The post-spawn transition — fish recovering from spawning stress and shifting back into aggressive feeding — is the stretch Pennsylvania river regulars plan their most serious float trips around. Tactical Bassin's identification of the shaky head and wobble-head jig as the early-summer combination of choice aligns with what experienced Susquehanna anglers have leaned on for years along offshore structure and current seams.

For catfish, June marks the opening of the most reliable nighttime big-fish window of the year on Pennsylvania's large river systems. Warming water accelerates metabolism, and flatheads in particular become aggressive nocturnal hunters through the summer months — a pattern consistent with what Wired 2 Fish documented on the Delaware River just last week.

No comparative population benchmarks or water-quality trend data from PA Fish & Boat Biologist Reports were available in this reporting cycle to assess how this season tracks against prior years. For stocking updates or any unusual conditions advisories before a trip, checking the PA Fish & Boat Commission's biologist reports directly is worthwhile.