Summer bass season peaks on Winnipesaukee as Merrimack drops to low flow

What's biting

What's next

With the Merrimack sitting at 121 cfs and no significant runoff typical of late June in southern New Hampshire, flows are likely to hold steady or ease slightly lower over the next two to three days. That translates to low, clear, and warm water on the main stem: ideal for targeting smallmouth bass in the shadows of undercut banks, bridge pilings, and deep mid-channel pools during the cooler bookends of the day.

The First Quarter moon on June 23 sets up productive morning and evening feeding windows through the weekend. First Quarter phases distribute feeding activity into the dawn and dusk hours rather than peaking overnight, making early-morning topwater runs along Winnipesaukee's weedline edges and points a worthwhile plan. Tactical Bassin lays out the summer pattern clearly: bass divide into two camps, shallow fish working the vegetation edge from first light until midmorning, and a deeper contingent holding on humps, rocky points, and mid-lake structural edges by midday. Working the shallow-to-deep transition zones around 9 to 11 a.m., before fish fully commit to the deep, can produce the best action of the day.

On the Merrimack, Fishing the Midwest notes that summer rivers reward versatility. Smallmouth in low, clear current respond well to natural-profile finesse plastics worked slowly through the strike zone, but switching to heavier tube jigs or drop-shot rigs in the deeper holes can flip the script when finesse baits draw short strikes. Shade is the key variable; shade adjacent to moving current is the premium location.

For fly anglers working the Merrimack's cooler tributaries and feeder streams, MidCurrent's current tying content includes high-contrast nymphs suited for low-light mornings and midge-style patterns built for clear, pressured water. Focus sessions on early morning before tributary temperatures push into the upper 60s, where trout activity drops sharply.

Landlocked salmon and lake trout on Winnipesaukee will continue retreating to thermocline depth through the weekend. Early-morning deep trolling passes in 40 to 60 feet of water remain the most reliable approach. Surface-temperature warming through the week will push the thermocline slightly deeper each day, so be prepared to let out additional line or lower downrigger weights if fish that were active yesterday seem absent today.

Context

Late June is a transition point in the New Hampshire freshwater calendar. On the Merrimack River, the spring American shad run, which typically peaks through May and winds down by mid-June, is finished for the season, handing the main stem back to smallmouth bass as the primary warm-weather target. A flow of 121 cfs at gauge 01073500 is consistent with typical summer baseflow for the Merrimack drainage, which commonly ranges between 100 and 300 cfs during dry stretches in June and July. Conditions this week appear on-schedule for the date.

None of the angler-intel feeds available this cycle include direct reports from Merrimack River or Lake Winnipesaukee sources, so local comparisons here are grounded in regional seasonal norms rather than corroborated on-the-water accounts. That is worth acknowledging honestly: this report reflects seasonal inference, not firsthand testimony from local captains or tackle shops.

On Lake Winnipesaukee, late June historically marks the close of the post-spawn shallow bite and the opening of the more structured summer pattern. Largemouth in the warmer, weedy coves and smallmouth on rocky mid-lake points both settle into predictable depth-and-cover associations by now, accessible to anglers who adjust timing for the heat. The cold-water species, particularly lake trout and landlocked salmon, follow the opposite trajectory: surface warming through June pushes them deep, and they typically stay there until the fall turnover.

The overall picture is on-schedule for late June: bass are the featured species across both the river and the lake, cold-water targets have retreated to depth, and the season is progressing normally into its summer chapter.