Merrimack Running 135 CFS Under Full Moon as NH Spring Salmon Window Peaks

What's Biting

What's Next

The full moon peaking tonight (May 3) is the dominant short-term variable. Landlocked salmon and bass typically push into shallower feeding lanes overnight under full-moon conditions, which means the first two hours after sunrise Saturday and Sunday — May 4 and 5 — are the priority windows this weekend. Fish that fed aggressively overnight tend to hold slightly deeper by mid-morning but remain catchable on slow-sinking and suspending presentations. On Lake Winnipesaukee, jig-and-twister rigs worked at the 15–25 foot thermocline zone are a reliable spring approach for togue (lake trout) and landlocked salmon in this moon phase; the post-full-moon period often pulls fish up from depth before stratification sets in.

Bass are in all likelihood approaching pre-spawn staging around Winnipesaukee's rocky coves, shallow gravel flats, and protected backwater coves this week. Water temperatures in the 50–58°F range — typical for the lakes region in early May — put largemouth and smallmouth in an aggressive pre-spawn mode where reaction baits shine. Field & Stream's recent crankbait breakdown highlights squarebill and medium-diving crankbaits as effective tools in the 4–8 foot zone where pre-spawn bass stack up; that guidance translates directly to Winnipesaukee's rocky northern shoreline structure.

On the Merrimack, the American shad run is the watch item for the next two to three weeks. The run typically develops on the lower Merrimack corridor through mid-May, and at 135 CFS the river is sitting at a comfortable, accessible stage for shad anglers working dart-and-flutter rigs in mid-current. If you're ahead of the shad push and targeting trout, the accelerating mayfly and caddis emergence flagged by Field & Stream this week makes mornings on faster, well-oxygenated tributary stretches the right play. Fish the hatch window — typically 10 a.m. through early afternoon — before warming afternoon air shuts surface activity down.

Context

Early May on Lake Winnipesaukee and the Merrimack watershed typically represents one of the better freshwater windows in New Hampshire's annual calendar. Ice-out on Winnipesaukee usually falls between late March and mid-April, meaning by the first week of May the lake is fully open and fish have had time to begin their seasonal repositioning toward spawning structure. In a normal year, landlocked Atlantic salmon and lake trout remain active near the surface through May before summer heat drives them to deeper, cooler strata — making this a fleeting window worth prioritizing.

This cycle's angler-intel feeds did not surface NH-specific reports from local shops, charter captains, or state agency bulletins, which is an honest gap to flag. The seasonal read here draws on USGS gauge 01073500 (135 CFS, within the normal spring range for this date) and established regional patterns. If you're booking a Winnipesaukee trip this weekend, a quick call to a Meredith or Laconia area tackle shop before launching will provide the ground-truth update this report cannot.

Broader regional signals are consistent with an on-schedule spring. On The Water's May 1 striper migration update notes the post-spawn push of large females out of the Chesapeake is building — not directly relevant to landlocked NH freshwater, but a reliable proxy that the coastal New England seasonal arc is progressing normally. Inland water temperatures typically track two to three weeks behind coastal salt, which puts Winnipesaukee and the Merrimack on a warming trajectory that aligns with what we'd expect for a typical year. No intel in the current feeds suggests an abnormally early or late start to the season.