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 142 CFS at the At Bethlehem Junction gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Ammonoosuc River fishable today?

Yes — Ammonoosuc River is rated fishable right now. Current flow is 142 CFS at the At Bethlehem Junction gauge.

Ammonoosuc River Fly Fishing Conditions

Live Conditions

Ammonoosuc River — At Bethlehem Junction

Fishable

142CFS

Discharge

1.95ft

Gauge Height

—

Water Temp

Updated 43 min agoView on USGS ↗

7-Day Flow

↓ Falling

RisingFallingStable

24-Hr Pressure

28.77 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

72°FClear sky

Wind 6 mph28.77 inHg Low & stable

Tough conditions — fish deep

Today

🌧️

Rain showers

79° / 60°

0.28"

Tomorrow

🌤️

Mainly clear

81° / 60°

Wed

☁️

Overcast

84° / 64°

Thu

🌦️

Drizzle

88° / 67°

0.06"

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.

9

Time of Day

Using: 142 CFS · Terrestrials peak. Caddis. Wild trout in cooler upper-river runs.

What should I pack?

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

🪰 Hatch Calendar

Ammonoosuc River · August · Late Summer

Full calendar →

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

Select month

JanDec

Terrestrials peak. Caddis. Wild trout in cooler upper-river runs.

CaddisTerrestrials

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.