Wade · Best fit48/100
Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
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Fly fishing report · Northeast
South Branch Raritan River
A South Branch Raritan report for Ken Lockwood Gorge and High Bridge trout planning, with flow, hatches, access, rules, and tactics.
Check flow & weatherToday's river scoreHigh source confidence
48
Caution
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.
Bank / edgeCheck
This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.
FloatCheck
This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.
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.
Loading current flow and weather.
River strategy
Use the High Bridge flow and confirm Ken Lockwood rules before fishing.
The South Branch Raritan is one of New Jersey's best-known trout rivers. Ken Lockwood Gorge is the headline reach, but the broader river has multiple access points and rule sets that need current checks.
- Use RiverReports or USGS at High Bridge before wading the gorge or nearby reaches.
- Check Ken Lockwood Gorge TCA rules before choosing flies and methods.
- Expect pressured fish; precise drifts beat heavy searching.
- Use temperature checks during warm weather and leave trout alone when water is stressful.
Why this score moved
FlowUse caution
USGS shows 36 cfs with a stable over about 6 hours trend. same-date USGS history (1919-2024, 106 readings) puts normal around 55 cfs and the lower quartile near 42 cfs; today's flow is below normal for the date. This is below normal, so edge depth, temperature, and pressure matter.
HeatUse caution
The NWS forecast is near 82F. Fish early and verify water temperature where trout stress is possible.
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 2:45PM EDT until July 15 at 8:00PM EDT by NWS Mount Holly NJ.
Best mode nowUse caution
Wade: Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
SeasonHelps score
Early summer: Caddis, sulphurs, terrestrials, and technical dry-dropper fishing.
Read the water
What changes the plan.
Best windows are cool, moderate flows with clear water and legal access. High water makes the gorge dangerous, and low clear water rewards small flies, longer leaders, and patient presentations.
Moderate and clear
Fish small nymphs, caddis, BWOs, and careful dry-dropper rigs.
Low clear water
Use long leaders, 6X, smaller flies, and stealth.
Slight stain
Try small streamers or larger nymphs near banks and plunge pools.
High water
Avoid gorge wading; fish elsewhere or wait for a safer drop.
Field plan
Fish it with intention.
Best flows
Use RiverReports and USGS 01396500 near High Bridge together for trend context. Moderate stable flow is ideal; high water makes gorge wading dangerous, while low clear summer water means smaller flies, longer leaders, and stricter temperature discipline.
When to skip
Skip the South Branch when Ken Lockwood Gorge rules are unclear, when flow makes the gorge unsafe, when warm weather pushes trout toward stress, or when obvious access is already crowded enough to flatten the experience.
Local plan
Start by choosing the river style you want: Ken Lockwood Gorge for the signature technical walk-and-wade day, High Bridge for the clearest live-flow reference, or upstream corridor water when you need more room than the famous gorge can offer.
Backup water
If the South Branch is crowded, too warm, or too high for the gorge, compare the Musconetcong or Pequest for other strong New Jersey trout options, or Flat Brook for a quieter small-river plan.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
March to AprilMidges, early stones, BWOs, stocked-trout nymphingZebra midge, black stonefly, BWO emerger, pheasant tail, egg only where legal
Reviewed pattern · report says “Zebra midge”Zebra MidgeLook for a very slim tapered thread body, evenly spaced contrasting wire rib, a small bead, and no tail or wing. The reviewed classic is black with silver wire and a silver bead. Red, olive, brown, glass-bead, jig-hook, resin-coated, or tailed forms must remain labeled variations rather than replacing the classic identity.See photos & how to fish it ↗
Reviewed family · report says “black stonefly”Black Stonefly PatternsBlack stonefly wording is a color and insect-group label, not one exact recipe. Size, nymph versus adult stage, wing profile, and weighting must remain explicit.See family guide ↗+ 3 more reviewed guides in the Fly Box May to JuneCaddis, sulphurs, March Browns, crane flies, light mayfliesElk hair caddis, caddis pupa, sulphur, March Brown, hare's ear
Reviewed pattern · report says “Elk hair caddis”Elk Hair CaddisLook for a tented elk- or deer-hair wing, clipped hair head, dubbed body, rib, and hackle palmered along the body. The body color should be labeled because tiers often match different natural caddis colors.See photos & how to fish it ↗
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 July to SeptemberTerrestrials, tricos in slower water, ants, beetles, summer caddisFoam ant, beetle, small hopper, trico spinner, dry-dropper
Reviewed family · report says “Foam ant”Ant PatternsAnt patterns can be foam, fur-bodied, winged, or sunken. The narrow waist and paired body lobes matter more than one material recipe.See family guide ↗
Reviewed family · report says “beetle”Beetle PatternsBeetle flies range from simple foam shells to hair-bodied and sunken forms. A rounded back and compact profile distinguish the family from ants and hoppers.See family guide ↗+ 2 more reviewed guides in the Fly Box Fall and winterBWOs, midges, scuds, small streamers during legal trout windowsBWO, zebra midge, scud, soft hackle, mini leech
Reviewed family · report says “BWO”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 pattern · report says “zebra midge”Zebra MidgeLook for a very slim tapered thread body, evenly spaced contrasting wire rib, a small bead, and no tail or wing. The reviewed classic is black with silver wire and a silver bead. Red, olive, brown, glass-bead, jig-hook, resin-coated, or tailed forms must remain labeled variations rather than replacing the classic identity.See photos & how to fish it ↗+ 3 more reviewed guides in the Fly Box 01
Confirm the Ken Lockwood Gorge rule set before fishing the gorge.
02
Nymph pocket water and pool heads with small mayfly, caddis, and scud patterns.
03
Use longer leaders and smaller indicators in low clear water.
04
Swing soft hackles during caddis and BWO activity.
05
Move away from crowded obvious pools and fish overlooked seams carefully.
Access & responsibility
Know the entry. Know the exit.
New Jersey trout regulations include Ken Lockwood Gorge TCA and other South Branch reach rules. Check current regulations before fishing.
Ken Lockwood Gorge
Headline trout reach with special regulation and crowding considerations.
High Bridge gauge reach
Primary live-flow reference and nearby access context.
Califon and Long Valley corridor
Broader upstream access context with reach-specific rules.
Transparent sources
Check the facts behind the plan.
Last material review: 2026-05-31
flowRiverReports South Branch Raritan near High BridgeflowUSGS South Branch Raritan near High Bridge 01396500regulationNew Jersey trout fishing regulationsregulationNew Jersey general trout informationaccessNJ Fish and Wildlife trout-water access listinventoryNJ Fish and Wildlife trout fishing informationsafetyNational Weather Service forecast point
Common questions
Before you leave.
What should I check first before fishing the South Branch Raritan River?+
Check RiverReports or USGS at High Bridge, NJ trout rules, Ken Lockwood Gorge TCA rules, access notes, weather, and water temperature.
Are there special regulations on the South Branch Raritan River?+
Yes. Ken Lockwood Gorge and other reaches have special trout rules that must be checked before fishing.
What flies should I bring for the South Branch Raritan 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 South Branch Raritan River?+
Yes at normal flows in many areas, but gorge footing and high water require conservative wading.
When should I skip the South Branch Raritan 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.