Stripers pushing into the Merrimack as the herring run peaks

What's Biting

What's Next

The next two to three days carry solid momentum for Merrimack striper anglers. On The Water's striper migration map, published May 22, notes that the spring run peaks around moon phases and hits shallow valleys in between. With today's First Quarter moon now in effect, we may be sitting at or just past a push of fresh fish entering the system. That argues for fishing the tide transitions actively through Memorial Day weekend rather than waiting for conditions to turn on.

Flow at the USGS gauge (site 01073500) came in at 72.9 cfs this morning, low and steady. Low-flow conditions on the Merrimack typically concentrate baitfish and their predators in deeper channel seams, under bridge pilings, and at the mouths of active herring tributaries. The Fisherman — South Shore MA to ME reports the herring run remains strong in the river, which is the key variable right now: find moving herring and you will find stripers stacked behind them. Fly anglers and light-tackle casters should do well with sparse herring-profile streamers or soft-plastic shads worked on a slow swing or steady retrieve through current breaks. Larger cut herring or live-lined herring should continue to draw big fish when tides are running.

On Lake Winnipesaukee, Memorial Day weekend typically marks the transition from the spawn to early post-spawn for both largemouth and smallmouth bass. By late May, females have generally retreated from spawning beds and are staging on the first drop-off adjacent to gravel and rocky flats: think 8 to 15 feet along rocky points and inside weed pockets. Tube baits, ned rigs, and drop-shots worked slowly through these transitions are reliable producers across New England lakes in this phase. As weed growth fills in over the coming week, frogs and weedless rigs will gain more target-rich water in shallow coves.

Trout anglers working stocked NH rivers and cold-water ponds should shift their timing toward early-morning and evening windows as late-May afternoons warm quickly. Low-light hours with a caddis presentation or small streamer will consistently outperform mid-afternoon attempts. Deeper, spring-fed sections and tailwaters can hold carryover fish active well into June. If the herring run holds through the weekend, and there is no signal yet that it is fading, the Merrimack striper bite should remain one of the more productive freshwater-adjacent opportunities in the region.

Context

Late May is historically one of the stronger freshwater windows in New Hampshire, and current conditions appear broadly on schedule. The Merrimack River striper run typically moves into the tidal lower river in late April and pushes upstream through May, driven by the herring migration. Reports from The Fisherman — South Shore MA to ME confirm 40-inch-class fish in the Merrimack corridor as of this week, which is consistent with the normal mid-to-late-May window for quality fish in this section. The run is neither dramatically early nor late.

For Lake Winnipesaukee specifically, no dedicated weekly reports appeared in the intel feeds this cycle, which is not unusual: the lake receives less routine coverage than the saltwater-adjacent systems of coastal Massachusetts and Maine. Historically, Winnipesaukee's bass spawn tracks slightly behind ponds and smaller lakes in southern New Hampshire, owing to the lake's size and thermal mass; late May through mid-June is the typical peak for spawning activity across the main basin and its protected bays. Landlocked salmon, a signature Winnipesaukee species, tend to go deep as surface temperatures climb in late May, making downrigger or lead-core trolling with smelt imitations the standard late-spring approach on the open-water basin.

The Fisherman — New England Freshwater feeds this week reported steadily improving bass action across Connecticut and Massachusetts lakes as water warms past the spawn trigger. That regional pattern typically mirrors conditions developing across southern Winnipesaukee, which warms ahead of the deeper northern basin. There is no signal in this week's intel of an unusual season. No early blowout, no cold-snap setbacks. The overall picture tracks close to the historical norm for the final week of May in central New Hampshire.