Late-June smallmouth and catfish push into summer mode on PA rivers

What's biting

What's next

Without current gauge or temperature readings, the forward look here is grounded in late-June seasonal norms for the Susquehanna and Allegheny drainages rather than live data — plan accordingly and verify USGS flow conditions before your trip.

**Smallmouth bass** should be the primary target over the next several days. Post-spawn fish have had a few weeks to recover and are typically feeding actively by late June, staging near mid-river boulders, wing dams, and deep-cut pools during the heat of the day before pushing to shallower gravel flats and current edges at dawn and dusk. Tactical Bassin notes that summer bass behavior becomes highly predictable once water temps stabilize — they'll concentrate near the three variables of shade, oxygen, and forage. Morning topwater and evening swimbait presentations along current breaks are worth prioritizing.

**Channel and flathead catfish** typically hit their summer peak through July, with night sessions on cut bait or live chubs near deep holes and log jams producing the most action. The Allegheny's mid-river structure is classic summer catfish habitat.

**Walleye** on the Allegheny will be holding in deeper pools and transitional ledges through summer. Fishing the Midwest's general river-fishing guidance points to dawn and dusk as the productive windows — jigs and night-crawlers worked slowly along bottom structure. Expect daytime action to be limited until evening cooling kicks in.

The First Quarter moon — peaking this week — typically supports decent low-light feeding windows around dusk and dawn rather than the full-moon nocturnal blitzes. Plan two- to three-hour sessions bracketing sunrise or sunset for the best odds.

The PA Sea Grant HABs webinar on June 25 is a timely reminder: monitor river backwaters and slower pools for blue-green algae blooms, which can appear rapidly in warm, calm weather. Avoid water that looks like green paint or has a surface scum, and keep pets out of suspicious areas.

Context

Late June on the Susquehanna and Allegheny is historically one of Pennsylvania's most productive freshwater windows, though it requires adapting to summer heat. Smallmouth bass are typically the marquee species on both systems by this point in the season — the post-spawn recovery phase usually wraps by mid-June, leaving aggressive, feeding fish through July. The Susquehanna's legendary smallmouth fishery, which stretches from the New York border down through the Harrisburg area, typically produces its best summer results when water temperatures are in the mid-60s to low-70s°F range; above 75°F, fish stress increases and catch-and-release mortality rises, so early-morning sessions become more important.

No source in this cycle provided a year-over-year comparison for the 2026 season on these rivers. PA Sea Grant's current focus appears to be on research investments and aquatic invasive species outreach rather than near-term angler conditions, so no agency-level assessment of how this season compares to prior years is available. The HABs webinar programming does suggest that water quality concerns are elevated enough to warrant public education efforts this summer, which is worth factoring into destination choices — particularly for slower, warmer backwater areas versus main-stem current.

In general, Fishing the Midwest's seasonal guidance — which notes that summer river fishing rewards anglers willing to work structure edges and vary their approach — tracks well with historical Susquehanna and Allegheny patterns. If no comparative signal becomes available from state agency reports in coming weeks, on-the-water observation of water clarity, surface temperature, and baitfish activity remains the most reliable local calibration tool.