Fly fishing report · Northeast

Merrimack River

A Merrimack River report for Franklin Junction and central New Hampshire planning, with flow, mixed-species tactics, access, and regulations.

Check flow & weather

Today's river scoreHigh source confidence

Good

Best option: Wade.

Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.

Updated Jul 13, 11:17 PM UTCUsually refreshes about every 45 minutes

Recommended approachWade

Mode scores adjust the river-wide score for the risks of wading, bank fishing, or floating.

Wade · Best fit70/100

Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.

Bank / edge70/100

Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.

Float70/100

A float is in play where this report supports boat access and wind, releases, and shuttle logistics are manageable.

Confirm before you leave

Flow and weather right now.

Use the flow trend to confirm the score before you leave. Weather can change the safest and most productive fishing window.

River strategy

Separate coldwater trout windows from warmwater river fishing.

The Merrimack is a broad river, not a small trout stream. Around Franklin it can offer coldwater windows and mixed fishing, while downstream reaches often make more sense for smallmouth and larger-river streamer tactics.

Use the Franklin Junction flow before planning a wade or float.
Bring trout flies for cool water and bass streamers or poppers for warmer reaches.
Look for soft seams, ledges, islands, and bank structure instead of featureless current.
Use NH rules and local access information for the exact reach you fish.

Why this score moved

FlowUse caution

USGS shows 862 cfs with a falling about 34% over about 6 hours trend. same-date USGS history (1904-2025, 99 readings) puts normal around 1,250 cfs and the lower quartile near 952 cfs; today's flow is below normal for the date. This is below normal, so edge depth, temperature, and pressure matter.

Public alertUse caution

A heat alert is active near this forecast point, so the score is capped until water temperature and fish-handling risk are checked. NWS alert: Heat Advisory issued July 13 at 2:22PM EDT until July 14 at 8:00PM EDT by NWS Gray ME.

SeasonHelps score

Early summer: Caddis, smallmouth movement, and better wade/boat windows.

WeatherHelps score

The NWS forecast is about 81F with Partly Cloudy.

Fishing usefulnessHelps score

Skip wading when the river is high, rising, cold and pushy, dam-influenced, or warm enough that trout handling is poor. Switch targets or choose smaller water.

Read the water

What changes the plan.

A stable-flow day with moderate temperatures gives the most options. High water makes wading risky, and summer heat should push anglers toward smallmouth, shaded margins, or a colder trout stream.

Moderate flow

Fish seams, ledges, island tails, and bank soft water.

High flow

Do not force wading; fish protected edges or use a boat plan only if safe.

Warm water

Target bass and warmwater species instead of trout.

Clear low water

Use longer casts, smaller streamers, and low-profile approaches.

Field plan

Fish it with intention.

Best flows

Use RiverReports and USGS 01081500 at Franklin Junction for the upper-river trend, then match that reading to the exact reach, dam influence, boat traffic, and wind.

When to skip

Skip wading when the river is high, rising, cold and pushy, dam-influenced, or warm enough that trout handling is poor. Switch targets or choose smaller water.

Local plan

Start at the Franklin flow, check NH rules and weather, then decide whether to fish trout seams, smallmouth ledges, bank structure, or a boat-access reach.

Backup water

If the Merrimack is too high, warm, windy, or access-complicated, compare Mascoma, Saco, or Androscoggin depending on whether trout or warmwater fishing is the goal.

Hatches & flies

Bring a flexible box.

TimingWhat to watchUseful flies

April to MayEarly trout hatches, baitfish movement, crayfish, and warming smallmouth flatsBWO emerger, caddis pupa, small Clouser, crayfish, black bugger

Reviewed family · report says “BWO emerger”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide

Reviewed family · report says “caddis pupa”Caddis Pupa PatternsCaddis pupa is a life-stage family. Curved bodies, wing pads, legs, beads, and soft-hackle collars differ among exact patterns and must be labeled.See family guide + 3 more reviewed guides in the Fly Box

June to AugustCaddis, damselflies, dragonflies, hoppers, minnows, crayfishPoppers, sliders, foam hopper, damselfly nymph, baitfish streamer

Reviewed family · report says “Poppers”Bass and Panfish Popper PatternsPoppers may use cupped foam, cork, balsa, deer hair, or pencil-shaped heads. Head face, size, buoyancy, tail, legs, and weed guard determine sound and action; a generic popper label does not identify one fly.See family guide

Reviewed family · report says “sliders”Warmwater Slider and Diver PatternsA slider has a tapered, flat, or softly shaped head that glides or pushes a small wake with limited noise. A diver has an angled, collared, folded, or otherwise shaped head that pulls below the surface when stripped and rises on the pause. Frog, baitfish, and large-insect profiles can be tied on either idea, so the exact head action, buoyancy, hook orientation, weed guard, and material must stay named.See family guide + 3 more reviewed guides in the Fly Box

September to OctoberCooling-water baitfish, late caddis, crayfish, fall streamer windowsClouser, small game changer, crayfish, soft hackle, small leech

Reviewed pattern · report says “Clouser”Clouser Deep MinnowThe reviewed chartreuse-and-white form uses sparse layered bucktail with flash around lead barbell eyes. The eyes make the fly sink between strips and ride hook point up; color, eye weight, hook, and saltwater materials must remain labeled.See photos & how to fish it

Reviewed pattern · report says “small game changer”Chocklett's Game ChangerA Game Changer uses a sequence of articulated shanks or spines whose body bulk tapers toward the tail, producing a multi-jointed baitfish profile. Finesse, feather, minnow, predator, surface-head, and micro versions remain separately labeled.See photos & how to fish it + 3 more reviewed guides in the Fly Box

Cold monthsLimited surface feeding; slower holes and warm afternoons matter mostSlow leech, jig streamer, small baitfish, nymph under indicator

Reviewed family · report says “Slow leech”Leech PatternsLeech patterns share an elongated moving silhouette, but material, weighting, hook orientation, and retrieve vary. Pine-squirrel, rabbit-strip, balanced, and Woolly Bugger forms remain separately labeled rather than being presented as one recipe.See family guide

Reviewed family · report says “jig streamer”Trout Streamer PatternsStreamer is a method-and-silhouette family, not a recipe. Size, color, weight, and presentation phrases stay visible, while baitfish, leech, sculpin, Woolly Bugger, and articulated identities link to their more specific destinations when known.See family guide + 1 more reviewed guide in the Fly Box

Use the Franklin gauge for upper-river planning, then inspect the actual reach before wading.

For trout windows, fish current seams with nymphs, soft hackles, and small streamers.

For smallmouth, work ledges, bridge shade, islands, and rocky banks with crayfish and baitfish flies.

Use poppers and sliders early or late in summer, then switch to subsurface flies in bright sun.

Avoid wading broad pushy current when a bank or boat plan is safer.

Access & responsibility

Know the entry. Know the exit.

Check New Hampshire freshwater regulations, seasons, species limits, and any local reach rules before fishing the Merrimack.

Franklin Junction gauge reach

Primary flow reference for upper Merrimack planning.

Concord corridor

Mixed warmwater fly-fishing with larger-river access decisions.

Manchester and lower reaches

More urban, warmwater, and access-specific planning.

Transparent sources

Check the facts behind the plan.

Last material review: 2026-07-06

flowRiverReports Merrimack River at Franklin Junction flowUSGS Merrimack River at Franklin Junction 01081500 regulationNew Hampshire freshwater fishing digest regulationNH Fish and Game fishing seasons regulationNH Fish and Game trout fishing inventoryNH Fish and Game stocking report safetyNational Weather Service forecast point accessNH Fish and Game where-to-fish access resources

Common questions

Before you leave.

What should I check first before fishing the Merrimack River?+

Check RiverReports or USGS at Franklin Junction, water temperature, NH rules, weather, and the exact access point.

Are there special regulations on the Merrimack River?+

Yes. Rules depend on species and reach, so use the current NH freshwater digest.

What flies should I bring for the Merrimack River?+

Bring the hatch-chart flies, a few confidence nymphs, and a streamer or warmwater box that matches the river's species. Then adjust for water temperature, clarity, and the insects or baitfish you actually see.

Can I wade the Merrimack River?+

Some sections can be waded at moderate flows, but the Merrimack is big water. Use the gauge and avoid unsafe crossings.

When should I skip the Merrimack River?+

Skip it when flows are unsafe, water is too warm for trout, emergency closures are active, or legal access for the reach is not clear.