Susquehanna Heats Up: Smallmouth and Cats Lead the Midsummer Bite

What's Biting

What's Next

The river sits at 5,140 cfs and 80°F as of Sunday afternoon, placing it at the upper edge of comfortable summer flow for wading. With a New Moon tonight, tidal pull is absent in this freshwater stretch, but moon phase still matters: new and full moons correlate with stronger nighttime catfish feeding pushes along deeper ledges and current seams on the main stem.

Over the next two to three days, absent significant rainfall or an arriving cold front, water temperatures are unlikely to drop meaningfully. Smallmouth bass anglers should plan for a two-window day. The first window runs through the two hours after first light, when surface temperatures haven't yet peaked and bass will still chase topwater and shallow presentations. Wired 2 Fish notes that once the sun climbs, bass push offshore to deeper structure; crankbaits worked along submerged ledges and wobble-head jigs dragged across bottom become the productive midday tactics, a pattern Tactical Bassin (blog) reinforces for early-summer river bass fishing.

Catfish anglers have the widest window of anyone this week. Channel and flathead catfish feed through the warmest nights of the year; set up on a deep outside bend or below a log-jam after dark with cut bait or prepared stink bait. The combination of 80°F water and new-moon darkness creates one of the better catfishing setups of the calendar year on both the Susquehanna and Allegheny drainages.

Walleye will likely be hugging the deepest, coolest holes during daylight hours at these temperatures. Early-morning trolling along deep channel edges before temps peak may produce scattered fish, but expect a tough bite until water cools later in the season.

Monitor PA Sea Grant's harmful algal bloom updates closely: blooms develop fast in warm, slack backwaters and can trigger closures with little warning. Check conditions before launching into slower-moving sections.

Context

Mid-June on the Susquehanna and Allegheny systems typically marks the transition from spring coolwater to midsummer warmwater conditions. Water temperatures in this stretch commonly work through the upper 60s and low 70s in early June before approaching the upper 70s and 80s in late June and July. A reading of 80°F on June 14 is on the early and warm end of that arc, suggesting either an early-arriving heat event or reduced cool groundwater input from a dry stretch preceding this week.

For trout anglers, the timing matters considerably. Pennsylvania's limestone spring creeks and the colder, shaded headwater tributaries of the upper Susquehanna watershed remain the only viable summer trout habitat once main-stem temperatures push past 75°F. Field & Stream's current trout temperature guide notes that voluntary and mandatory hoot owl restrictions are a real management tool that agencies apply during summer heat stretches; anglers should check applicable regulations and any posted advisories before targeting trout on any main-stem reach this time of year.

For warmwater species, an early warm push is not entirely unwelcome. Smallmouth bass in the Susquehanna system are well adapted to seasonal heat and typically reach peak feeding activity in the 65-75°F range before moderating somewhat above 80°F; the bite shifts toward shoulder-hour windows rather than shutting down entirely. Catfish actively favor the warm conditions that put other species off the bite, making them the most seasonally appropriate target right now.

The angler-intel feeds available this week contained no direct, PA-specific bite reports for the Susquehanna or Allegheny rivers. This update accordingly leans on gauge data, seasonal patterns, and general summer warmwater guidance rather than on-the-water testimony from local sources. Anglers with firsthand reports from this system this week will have sharper real-time intelligence than any regional aggregate feed can provide.