Allegheny tailwaters prime for summer smallmouth as new moon arrives

What's Biting

What's Next

With no current gauge readings for the Allegheny or Pittsburgh tailwaters, a precise flow or temperature forecast is not possible this cycle. That said, mid-June in western Pennsylvania typically pushes river water temperatures into the mid-to-upper 70s by late afternoon, well outside the comfort zone for cold-water species and signaling a decisive shift toward early-morning and evening sessions for most warmwater targets.

Plan your primary session around the 5:30 to 9:00 a.m. window. Water is at its coolest at dawn, smallmouth bass are most active near shallow rocky structure, and the new moon phase today reinforces the low-light bias. Lunar new moon phases suppress ambient nighttime light, which correlates with more concentrated feeding in predatory tailwater species including smallmouth, sauger, and channel catfish. The two to three days following a new moon often see fish spread across more of the water column rather than holding tight to bottom structure, so cover both mid-column and the bottom when prospecting new river stretches.

Tactically, Tactical Bassin this week points to a swing-head jig paired with a shaky-head worm as the most reliable early-summer river bass setup, a combination that works the Allegheny's gravel and rock bottom well. As water temperatures climb through the day, look for smallmouth to push off the immediate tailrace turbulence and hold on secondary eddies and current seams 100 to 300 yards downstream of each dam structure. Fishing the Midwest notes that rivers reward anglers who work structure methodically in summer, and that discipline pays dividends across the Allegheny pool system.

Catfish action should build through this week. Channel catfish in the Pittsburgh rivers respond strongly to warming water, and warm June nights are typically the most productive window, roughly one hour before dark through midnight. Bottom rigs near current breaks below dam faces are the standard approach for this fishery.

Walleye and sauger are the wildcard for midsummer. The low-light windows at dawn and dusk, reinforced by the new moon phase, represent the best opportunity. Bottom-bounce a jig-and-minnow combination through the swift water immediately below dam aprons at first light, and keep sessions short once the sun climbs and surface activity quiets.

Context

For western Pennsylvania's tailwater fisheries, mid-June sits at the boundary between late-spring opportunity and full summer patterns. Smallmouth bass typically complete spawning by late May to early June at this latitude, meaning fish in the Allegheny and Monongahela are coming off beds and feeding actively through the first weeks of June. By mid-month, most fish have moved off spawning flats and are establishing summer holding lies in current breaks, boulder fields, riprap banks, and deep eddies along the outside bends of each pool section. This transition is generally on schedule for the Pittsburgh tailwaters at this point in the season.

PA Fish & Boat Commission's Biologist Reports, accessible through the Commission's website, track species-specific observations across the Allegheny drainage. This cycle's data pull did not return an active in-region report for the Pittsburgh tailwater district, so a direct year-over-year comparison is not available for this update.

One timely regional note from PA Sea Grant: a free public webinar on harmful algal blooms (HABs) is scheduled for June 25, 2026, in partnership with the Pennsylvania Department of Environmental Protection. HABs are a growing warm-weather concern on Pennsylvania waterways. While the Allegheny and Monongahela are moving-water systems that resist bloom conditions more than slack-water impoundments, anglers fishing back eddies or slack coves during hot, calm stretches should watch for visible surface discoloration or foam lines indicating a potential bloom.

Nationally, Wired 2 Fish reports that flathead catfish can reach extraordinary sizes in large river systems, a useful reminder that the Ohio drainage below Pittsburgh holds genuine trophy flathead potential. Summer nights are historically the prime window for targeting these fish, though patient spot selection near deep structure is essential for consistent results.