Bass Pre-Spawn Underway: Merrimack at 133 cfs, Winnipesaukee Coves Warming

What's Biting

What's Next

Over the next two to three days, flow at USGS gauge 01073500 is expected to hold in a similar moderate range as post-snowmelt recession continues. At 133 cfs, the Merrimack main stem and its accessible tributaries offer stable footing for wading anglers targeting smallmouth bass, trout, and perch. Small New England rivers respond quickly to rainfall, so check the gauge before heading out if precipitation is in the forecast.

Bass conditions are likely to remain strong through the weekend. Wired 2 Fish's current breakdown covers the pre-spawn and spawn window in detail: lead with a larger swimbait to cover water and draw active fish off shallow structure, then follow up with a finesse bait to close out followers that don't commit. On Lake Winnipesaukee, morning sessions on gradually warming coves — particularly secondary bays with soft bottom and emergent vegetation — are the highest-percentage target. Windward banks tend to concentrate baitfish and are worth working along the edges.

Landlocked salmon deserve serious attention before the thermocline hardens. We're seeing a typical early-May setup where these fish are still roaming at accessible depths; trolling streamer patterns or casting near tributary mouths and inlets is worth prioritizing this week. Once late-May warmth locks in stratification, salmon push too deep for most nearshore presentations.

For fly anglers on Merrimack tributaries, MidCurrent's current tying coverage highlights caddis emerger and nymph setups aligned with what should be coming off New Hampshire streams right now. Field & Stream's primer on aquatic insects for trout — covering mayflies, stoneflies, caddisflies, and midges — is a practical framework for reading the hatch as it diversifies through May. Target late-afternoon windows, roughly 3–6 p.m., when caddis activity typically peaks in moderate spring temperatures.

The waning gibbous moon sets progressively later each night this week, meaning overnight light diminishes gradually toward the third quarter. Watch for a modest uptick in early-morning feeding activity as the moon pulls back — plan lake access for first light to take advantage of that transitional window before boat traffic picks up.

Context

Early May is traditionally one of the most productive stretches of the NH freshwater season, and the current setup appears broadly on schedule. Ice-out on Lake Winnipesaukee typically completes in late April, making the first two weeks of May the effective start of open-water fishing across the lake. A flow of 133 cfs at USGS gauge 01073500 is consistent with typical late-snowmelt recession for this date in the Merrimack watershed — neither flood-stage nor drought stress. The spring high-water peak appears to have already passed, and conditions look normal for the seasonal calendar.

No NH-specific charter reports, local shop posts, or state agency updates appeared in this reporting period's angler-intel feeds. The national blogs covered bass, trout, and fly fishing topics broadly without drilling down to Winnipesaukee or the Merrimack specifically. The Wired 2 Fish bass spawn coverage and MidCurrent's spring hatch content are nationally published but reflect patterns that are timely and applicable for this region. That said, the absence of local ground-truth is worth noting honestly: anglers who have been on the water recently are encouraged to share reports through local tackle networks and New Hampshire Fish & Game channels, which remain the most reliable real-time signal when aggregate feeds do not localize.

What history suggests for this window: landlocked salmon and lake trout on Winnipesaukee are typically active and catchable through mid-May before thermal stratification drives them deep. Bass pre-spawn and spawn typically peak between May 15–25 in an average year. Fly-fishing hatches on the Merrimack and its tributaries diversify steadily through May, with caddis and early mayflies — Hendricksons in particular — historically among the dominant patterns in the first two weeks. This year's timing appears consistent with that norm based on available data.