Wade · Best fit32/100
Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
All New Jersey reports
Fly fishing report · Northeast
South Branch Raritan River
Is South Branch Raritan River worth the trip today? Check flow, weather, hatches, access, and rules for New Jersey before you go.
See the flow chart ↓Photo: Zeete Opens in a new tab. · CC BY-SA 4.0
Good day to fish?Latest river check
Caution
Maybe. Read the cautions first.
52
Best option: Wade. Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
See update time and confidence
Live data checkHighHow much of the live flow, weather, and alert data came back.
Today's callMediumWater temperature not verified; do not use this score to clear warm-water risk.
Score calculated Aug 23, 2026, 12:51 AM EDTUsually checks again about every 45 minutes
Best access methodWade
These scores compare the risks of wading, bank fishing, and floating.
Bank / edgeNot recommended
This report does not recommend bank fishing on this reach.
FloatNot recommended
This report does not recommend floating this reach.
Your plan
Today's South Branch Raritan River plan.
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.
- Check first
- Use RiverReports or USGS at High Bridge before wading the gorge or nearby reaches.
- Try
- Confirm the Ken Lockwood Gorge rule set before fishing the gorge.
- Leave when
- 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.
Live river check
What the river is doing
Check the latest flow and weather before you go. A quick change can make the river harder or less safe to fish.
Showing the latest stored river check while current readings load.
- Flow
- 103 cfs
- From the latest stored river check. Open the official source for the newest reading.
- Air now
- 66°F
Current NWS forecast period
- Next 24h high
- 79.0°F
NWS air forecast near
- Rain chance
- 33%
For this forecast period
This is an air forecast, not a river-temperature reading. Check the water with a stream thermometer before fishing in hot weather.
Latest stored weather check
Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
- Wind
- 0 mph
- Weather checked
Recent flow chart is loading
The latest stored reading is shown above. Check the official source below if you need the newest value now.
More forecast and source details
National Weather Service
South Branch Raritan near High Bridge
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: South Branch Raritan River near High Bridge
How to fish it
How to fish South Branch Raritan River today.
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.
Fishing words used on this page
- U.S. Geological Survey (USGS) gauge
- A USGS gauge is an official river station that measures flow or water height.
- Cubic feet per second (cfs)
- Cubic feet per second, or cfs, shows how much water passes the gauge each second.
- Technical fishing
- Technical fishing means the fish are hard to fool, so careful casts and natural drifts matter.
- Nymph
- A nymph is a young water insect. Anglers also use the word for a fly that copies it.
- Presentation
- Presentation means how you cast and move the fly so it looks natural to a fish.
- Seam
- A seam is the line where fast and slow water meet.
- Blue-winged olive (BWO)
- Blue-winged olives, or BWOs, are small mayflies that often hatch in cool or cloudy weather.
- Caddis
- Caddis are small water insects. The adults look a little like tiny moths.
- Dry-dropper
- A dry-dropper rig has a floating fly with an underwater fly tied below it.
- Emerger
- An emerger copies an insect as it rises from below the water toward the surface.
Why this call
Why this score
Best mode nowHurts
Wade: Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
FlowUse caution
USGS shows 103 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1919-2024, 106 readings) show a median near 48 cfs and the upper quartile near 80 cfs; today's flow is high for the date. Fishable water may exist, but do not rate it highly without a safe access, clarity, and wading or boat plan.
Short-term weatherUse caution
The forecast has storm or heavy-precipitation risk, so timing and access matter more than the score alone.
SeasonHelps
Summer: Early cool windows only; check temperature before trout fishing.
WeatherHelps
The current NWS air forecast is about 66F, and the next 24-hour high reaches about 79F. Chance Showers And Thunderstorms.
Trip notes
Trip notes
Check these before you choose a reach.
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.
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.
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 area water when you need more room than the famous gorge can offer.
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.
What to try
South Branch Raritan River flies through the year.
Match the time of year, then let rising fish and current speed guide the next change.
SeasonWhat to look forFlies to try
March to April
What to look forMidges, early stones, BWOs, stocked-trout nymphing
May to June
What to look forCaddis, sulphurs, March Browns, crane flies, light mayflies
July to SeptemberCurrent
What to look forTerrestrials, tricos in slower water, ants, beetles, summer caddis
Flies to try
Fall and winter
What to look forBWOs, midges, scuds, small streamers during legal trout windows
Each fly name opens its matching Fly Box guide.
Access and safety
South Branch Raritan River access and rules.
Use these places as starting points. Open the access link below and check posted signs before you park or enter. New Jersey trout rules include Ken Lockwood Gorge TCA and other South Branch reach rules. Check current rules before fishing.
Ken Lockwood Gorge
Headline trout reach with special fishing rule and crowding considerations.
High Bridge gauge reach
Primary live-flow reference and nearby access context.
Califon and Long Valley area
Broader upstream access context with section-by-section rules.
Ken Lockwood Gorge parking and foot traffic can be limited. Have a secondary access plan.
Rules change by reach, so do not assume the whole river follows one method or harvest rule.
High water in the gorge can make wading unsafe even when the river looks fishable from the road.
River sources
Official South Branch Raritan River sources.
Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.
How this report was checked
How this report was checked
Reviewed byBlueStreamFly River Review Team
Trip guidance checked
What was checked: This report is maintained from current regulation, access, flow, weather, and public planning sources so anglers can make better trip decisions than a raw gauge or generic overview would allow.
Live measurements and forecasts keep their provider timestamps. Rules, access, and trip guidance use the source-review date shown here. BlueStreamFly planning advice is editorial interpretation, not an agency notice.
First-hand experience: BlueStreamFly does not claim a first-hand visit or local field test for this report unless a real contributor is explicitly named and linked.
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
Flow and weather
Check the latest river reading and forecast before you leave.
Access and land
Check public entry points, land rules, and seasonal access changes.
More helpful links
Use these links for stocking, safety, and other local details.
See all 7 checked sources
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
What this source covers
Open the current rules and check the river section, season, and special limits.
What this source covers
Open the current rules and check the river section, season, and special limits.
Flow and weather
Check the latest river reading and forecast before you leave.
What this source covers
Open this page and check the latest safety advice before your trip.
What this source covers
Open this river reading to check the latest level, flow, and update time.
What this source covers
Open this river reading to check the latest level, flow, and update time.
Access and land
Check public entry points, land rules, and seasonal access changes.
What this source covers
Open the land or access page, then check signs before you park or enter.
More helpful links
Use these links for stocking, safety, and other local details.
What this source covers
Open this page for stocking or fish population information.
Quick answers
Quick South Branch Raritan River answers.
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 fishing rules 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.