Susquehanna & Allegheny Smallmouth and Catfish in Full Summer Mode

What's biting

What's next

With water temperatures at 79 degrees F and flow holding at a moderate 5,290 cfs, the next two to three days offer predictable summer patterns for anglers willing to work the right time windows.

Smalmouth bass remain the primary draw on both drainages. Tactical Bassin's summer analysis identifies three variables driving July fish location: proximity to deep water, current breaks that concentrate baitfish, and overhead structure providing shade during peak afternoon heat. On the Susquehanna and Allegheny, that translates to ledges, wing dams, and deep mid-river flats. Wired 2 Fish's July 2026 lure roundup names topwater poppers, soft jerkbaits, and drop shots as the multi-technique toolkit for this time of year. The topwater bite is best in the first 90 minutes of daylight, with deeper presentations taking over once the sun climbs and fish drop back to structure.

Catfish are the sleeper pick for the holiday weekend. Field & Stream's current summer catfishing coverage makes the case for warm-river drift fishing after dark, with cut bait working the slower outside bends of major rivers. The 79-degree water sits squarely in the preferred thermal range for channel and flathead cats, and overnight sessions on the deep pools of both rivers give anglers a legitimate shot at quality fish.

The full moon on June 30 adds a factor worth planning around. Nocturnal feeding activity on larger bass and catfish typically intensifies in the nights surrounding a full moon; a late-evening session on a deep pool edge could produce the best catches of the weekend.

Walleye on the Allegheny typically retreat to deeper, cooler water once summer temperatures peak. First-light and last-light windows near deep main-channel structure, worked with slow-rolled jigs or bottom bouncers, are the standard summer prescription. Expectations should be tempered until temperatures drop back toward the mid-60s.

One flag before launching: PA Sea Grant's June 25 harmful algal bloom webinar noted that Pennsylvania waterways face growing HAB risk during warm, low-circulation summer conditions. Check the state DEP advisory page for active bloom warnings before wading or fishing slow backwater pools, particularly on reservoir sections.

Context

A reading of 79 degrees F on the Susquehanna in late June falls within the expected range for this point in the season. Central Pennsylvania rivers typically climb into the mid-to-upper 70s through late June, with peak water temperatures arriving in late July and sometimes holding there into August. The more critical threshold for the Susquehanna system is roughly 85 degrees F, where smallmouth bass begin showing signs of thermal stress; at 79 degrees, fish are warm but actively feeding and approachable on the right presentations.

The 5,290 cfs flow at USGS gauge 01540500 represents moderate early-summer conditions. The Susquehanna typically reaches its seasonal low flows in late July and August, so the current discharge is consistent with the leading edge of summer drawdown rather than its lowest point. The Fly Fishing Forum flagged the beginning of a regional drought in late June, though that observation comes from forum discussion rather than confirmed agency reporting in this cycle. If drought conditions deepen through July, anglers should expect flows to fall further, water clarity to improve, and fish to consolidate around the deepest and best-oxygenated pools.

Historically, the Fourth of July weekend on the Susquehanna and Allegheny marks the height of early-morning smallmouth surface activity for the season. By mid-July, the productive topwater window typically narrows to a brief hour at first light before daytime heat shuts it down entirely. Catfishing traditionally strengthens as the warmest weeks of summer take hold, and the Fourth of July window often coincides with some of the best after-dark catfish fishing of the year on the main-stem Susquehanna.

No current biologist field reports from the PA Fish & Boat Commission appeared in this reporting cycle's intel feeds, limiting specific year-over-year comparative data. The available gauge readings and national fishing intel suggest conditions are broadly on track for what the region typically sees in the final week of June.