What flies are hatching on the Ammonoosuc River right now?

Current and seasonal hatches on the Ammonoosuc River include Hendrickson, Caddis, Sulphur. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Ammonoosuc River?

The Ammonoosuc River is running at 45.9 CFS at the At Bethlehem Junction gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Ammonoosuc River fishable today?

Ammonoosuc River is rated marginal right now. Flow is 45.9 CFS at the At Bethlehem Junction gauge. Go in prepared — heavier tippet, cautious wading, or target edges and seams.

Ammonoosuc River Fly Fishing Conditions

Live Conditions

Ammonoosuc River — At Bethlehem Junction

Marginal

45.9CFS

Discharge

1.22ft

Gauge Height

—

Water Temp

Updated 25 min agoView on USGS ↗

7-Day Flow

↓ Falling

RisingFallingStable

24-Hr Pressure

28.81 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

49°FPartly cloudy

Wind 2 mph28.81 inHg Low & stable

Tough conditions — fish deep

Today

🌦️

Drizzle

72° / 56°

0.06"

Tomorrow

🌫️

Foggy

67° / 47°

Sat

☁️

Overcast

62° / 41°

Sun

🌦️

Drizzle

59° / 47°

0.16"

Cold front incoming — go deep with nymphs, surface activity likely slow.

Weather by Open-Meteo · No API key · Updated every 30 min

What should I fish today?

⚡ AI

AI-powered recommendation using today's live flow, temperature, and hatch data.

6

Time of Day

Using: 45.9 CFS · BWOs

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Ammonoosuc River conditions.

🪰 Hatch Calendar

Ammonoosuc River · September · Early Fall

Full calendar →

Showing typical dates — water temperature data unavailable for live hatch predictions.

Select month

JanDec

BWOs (size 18-20) returning. Cool water reactivates fish.

Blue-Winged Olive

River Map

Loading map…

USGS Gauge (click for site ID)Fishing Access / SectionScroll to zoom disabled — use map controls

About Ammonoosuc River

Flows west from Twin Mountain toward the Connecticut River. A mix of stocked and wild fish; the upper river near Twin Mountain runs cold and clear from White Mountain headwaters. The gauge at Bethlehem Junction reads the productive middle river well. Some fly-fishing-only regulations apply in upper sections — verify current NH F&G regs.

HendricksonCaddisSulphurGreen DrakeLight CahillBlue-Winged Olive

Regulations

NH fishing license required. Some fly-fishing-only regulations in upper sections — check NH F&G. Standard regs on stocked stretches.

Learn More

Guides to help you fish Ammonoosuc River with more confidence.