What flies are hatching on the South Branch Raritan River (Ken Lockwood Gorge) right now?

Current and seasonal hatches on the South Branch Raritan River (Ken Lockwood Gorge) 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 South Branch Raritan River (Ken Lockwood Gorge)?

The South Branch Raritan River (Ken Lockwood Gorge) is running at 53.1 CFS at the At High Bridge, NJ (gauge unverified) gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the South Branch Raritan River (Ken Lockwood Gorge) fishable today?

South Branch Raritan River (Ken Lockwood Gorge) is outside its fishable window right now. Flow is 53.1 CFS at the At High Bridge, NJ (gauge unverified) gauge. Check back when conditions return to the normal range.

South Branch Raritan River (Ken Lockwood Gorge) Fly Fishing Conditions

Live Conditions

South Branch Raritan River (Ken Lockwood Gorge) — At High Bridge, NJ (gauge unverified)

Unfishable

53.1CFS

Discharge

5.96ft

Gauge Height

69.8°F

Water Temp

Updated 39 min agoView on USGS ↗

Live Conditions

South Branch Raritan River (Ken Lockwood Gorge) — At Stanton, NJ (gauge unverified)

Marginal

77.3CFS

Discharge

2.60ft

Gauge Height

—

Water Temp

Updated 24 min agoView on USGS ↗

7-Day Flow

↓ Falling

RisingFallingStable

24-Hr Pressure

29.85 inHg · → High/stable

Falling (good)RisingHigh/stable

Voluntary Catch-and-Release Advisory

Water temperature is at or above 65°F. At these temperatures trout are physiologically stressed and have a higher post-release mortality rate. Consider waiting for cooler conditions — early morning or evening — or choosing a tailwater with regulated temperatures.

Local Weather

64°FOvercast

Wind 11 mph29.85 inHg Stable

Normal conditions

Today

🌦️

Drizzle

81° / 68°

Tomorrow

🌫️

Foggy

82° / 64°

Sat

☁️

Overcast

71° / 58°

Sun

🌧️

Rain

67° / 62°

0.51"

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.

2

Time of Day

Using: 53.1 CFS · 69.8°F · BWOs

What should I pack?

Rod, flies, tippet, and safety gear specific to today's South Branch Raritan River (Ken Lockwood Gorge) conditions.

🪰 Hatch Calendar

South Branch Raritan River (Ken Lockwood Gorge) · September · Early Fall

Full calendar →

🟡 Approaching — within 5°F of trigger range

Caddis

Select month

JanDec

BWOs (size 18-20) returning.

Blue-Winged Olive

🟢 Active · 🟡 Approaching · ⚪ Seasonal only

River Map

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

About South Branch Raritan River (Ken Lockwood Gorge)

The crown jewel of New Jersey fly fishing — the Ken Lockwood Gorge section in Hunterdon County offers a dramatic, roadless canyon of freestone water holding wild and stocked brown and rainbow trout. Designated fly-fishing only with catch-and-release through much of the gorge, it fishes best at low-to-moderate flows with dry flies and nymphs. It draws serious anglers from across the Mid-Atlantic for its combination of wild fish, scenery, and quality regulations.

HendricksonCaddisSulphurMarch BrownLight CahillBlue-Winged Olive

Regulations

Fly-fishing only in the Ken Lockwood Gorge (approx. 2.5 miles). Catch-and-release only for trout within the gorge. Standard NJ trout season applies outside the gorge. Check current NJDEP regulations for special season dates and size/creel limits. NOTE: USGS gauges 01396500 and 01397000 are unverified — flow data may be stale or unavailable; check with local outfitters as backup.

Learn More

Guides to help you fish South Branch Raritan River (Ken Lockwood Gorge) with more confidence.