7-day U.S. Geological Survey chart
Recent flow
Discharge
3,550 cfs1,020 cfs
Sep 5Sep 12
Latest reading: 1,020 cfs. Falling over about 6 hours. Chart covers Sep 5 through Sep 12; readings are provisional and may be revised.
Should I go fishing?
Skip fishing here today.
No access method is recommended today. Review the live conditions below before choosing another river or day.
Check first: Water temperature is unconfirmed. Use a stream thermometer before fishing.
Fishing rating38
Rating updatedRiver local time:
Why this recommendation?
USGS shows 1,020 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1939-2025, 87 readings) show a median near 337 cfs and a high-water marker near 895 cfs; today's flow is above that high-water marker. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.
Available live dataHighHow much of the live flow, weather, and alert data came back.
Confidence in this recommendationMediumWater temperature not verified; do not use this score to clear warm-water risk.
Usually checks again about every 45 minutes
If you go
- Check first
- USGS 03029500 is the best main river gauge for this page.
- Try
- Pick the fishery first: main river smallmouth, upper trout, or float-and-scout day.
- Leave when
- Skip or pivot when main river flow is pushy, strainers or boat logistics are not sorted out, water is too warm for trout handling, storms are nearby, or trout reach rules are not confirmed.
Flow and weather
Showing server-checked river conditions while current readings refresh.
- Flow
- 1,020 cfs
- Falling over about 6 hoursU.S. Geological Survey may revise this reading
- Air forecast
- 58°F
- Next 24h high
- 76.0°F
NWS air forecast near
- Rain chance
- 0%
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
Mostly Cloudy
- Wind
- 2 mph
- Weather checked
More forecast and source details
Mostly Cloudy
National Weather Service
Cooksburg, Pennsylvania
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
Current U.S. Geological Survey gauge: Clarion River at Cooksburg
Falling over about 6 hoursU.S. Geological Survey may revise this readingObserved
Flies for this time of year
Seasonal starting points, not a live hatch report. Match what you see on the water.
- Ant PatternsantView fly guide ↗
- Beetle PatternsbeetleView fly guide ↗
- Grasshopper Patternssmall hopperView fly guide ↗
- Jig Fly Patternssmall jig nymphView fly guide ↗
See flies for every season
SeasonWhat to look forFlies to try
January to March
What to look forMidges, little black stones, BWOs, and slow nymph windows
April to June
What to look forHendricksons, March Browns, sulphurs, caddis, BWOs, and spinner falls
July to SeptemberThis season
What to look forTricos where present, ants, beetles, hoppers, and shade-line terrestrials
Flies to try
antAnt Patterns→beetleBeetle Patterns→small hopperGrasshopper Patterns→small jig nymphJig Fly Patterns→
Also try Trico, dry-dropper
October to December
What to look forBWOs, midges, caddis remnants, and streamer windows after rain
Each fly name opens its matching Fly Box guide.
More fishing tips
Methods, fish species and trip notes
How to fish Clarion River today.
Stable, clear flows make the main river better for smallmouth and streamer work. Cooler spring and fall windows can bring more trout-style tactics into the plan.
Stable medium flow
Fish boulder edges, ledges, shade banks, and current breaks with streamers, nymphs, and crayfish.
Low clear summer flow
Use smaller streamers, poppers, long casts, and early or late light.
High water
Shift to safe banks, boat planning, or a smaller backup creek.
Cool spring/fall water
Bring trout nymphs and soft hackles for upper sections where legal and practical.
Wading, bank fishing or floating?
Not recommended todayChoose another river or day
No access method is recommended in today's conditions. Review the live river and weather checks before making another plan.
Wading3/100
Not recommended today. Recheck the river, weather, and access before planning another trip.
Bank fishingNot recommended
Not recommended today. Recheck the river, weather, and access before planning another trip.
Floating42/100
Not recommended today. Recheck the river, weather, and access before planning another trip.
Full river report
Is Clarion River worth the trip today? Check flow, weather, hatches, access, and rules for Pennsylvania before you go.
The Clarion around Cooksburg is best treated as a mixed fly-fishing river: smallmouth and float planning matter, while trout opportunity is more section-by-section upstream or in special sections. Use the Cooksburg gauge for the main river plan.
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.
- Pennsylvania Fish and Boat Commission (PFBC)
- PFBC is the Pennsylvania agency that sets fishing rules and manages fish and access programs.
- Cubic feet per second (cfs)
- Cubic feet per second, or cfs, shows how much water passes the gauge each second.
- Nymph
- A nymph is a young water insect. Anglers also use the word for a fly that copies it.
- 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.
- Jig nymph
- A jig nymph is a weighted underwater fly made to ride with its hook point up.
- Midge
- Midges are tiny flies and a common trout food, especially in cold water.
Why this call
Why this score
FlowHurts
USGS shows 1,020 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1939-2025, 87 readings) show a median near 337 cfs and a high-water marker near 895 cfs; today's flow is above that high-water marker. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.
Public alertUse caution
A Flood Watch is active near this forecast point, so the score is capped until runoff, clarity, crossings, and road access are checked. NWS alert: Flood Watch issued September 12 at 1:54AM EDT until September 13 at 1:00AM EDT by NWS Pittsburgh PA.
SeasonHelps
Fall: Cooling water helps streamers, smallmouth, and reach-specific trout tactics.
WeatherHelps
The current NWS air forecast is about 58F, and the next 24-hour high reaches about 76F. Mostly Cloudy.
Fishing usefulnessHelps
Skip or pivot when mainstem flow is pushy, strainers or boat logistics are not sorted out, water is too warm for trout handling, storms are nearby, or trout reach rules are not confirmed.
Trip notes
Check these before you choose a reach.
Use USGS 03029500 at Cooksburg for the main river plan and USGS 03028500 at Johnsonburg for upper-river context. Stable readable flow is best. High water, poor exits, or warm trout conditions should change the plan.
Skip or pivot when main river flow is pushy, strainers or boat logistics are not sorted out, water is too warm for trout handling, storms are nearby, or trout reach rules are not confirmed.
Start with the Cooksburg gauge, PFBC water-trail guidance, current rules, and one realistic access or float plan. Decide whether the day is main river smallmouth, upper trout, or a mixed scout before rigging.
If the Clarion is high, crowded, too warm, or logistically awkward, compare the Allegheny River for a larger tailwater plan, Oil Creek for smaller trout water, or Slippery Rock Creek for a different western Pennsylvania option.
Clarion River access and rules.
Use these places as starting points. Open the access link below and check posted signs before you park or enter.
Before you go
Check the PFBC summary book and water-specific rules before fishing. Trout and warmwater rules differ by reach and season.
Where to access the river
Cooksburg area
Primary main river flow and access orientation for this page.
Clarion River water trail
Use PFBC resources for ramps, float distances, and trip timing.
Upper/West Branch trout context
Treat these as separate rule checks, not the same plan as the lower main river.
- The Clarion is a better page when it separates main river smallmouth from section-by-section trout reach details.
- Use water-trail access and current conditions before planning a float.
- Remote banks and strainers can turn a casual float into a safety issue.
Sources and report details
Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.
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.
See all 6 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.
How this report was checked
How this report was checked
Reviewed byBlueStreamFly River Review Team
Trip guidance checked
What was checked: This Clarion River report is maintained from Pennsylvania Fish and Boat Commission regulations, PFBC trout classification information, PFBC Clarion water-trail access guidance, USGS Cooksburg and Johnsonburg flow data, weather, media-credit, and western Pennsylvania mainstem planning sources.
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.
Quick questions
What should I check first before fishing the Clarion River?
Check USGS 03029500 at Cooksburg, then decide whether your day is a main river smallmouth plan or a section-by-section trout plan.
Where should a first-time visitor start on the Clarion River?
Start around Cooksburg and the PFBC water trail for main river orientation.
Can I wade the Clarion River?
Some wading is possible, but the Clarion is a main river. Treat higher flows as boat or bank-only conditions.
What flies should I bring for the Clarion River?
Bring the seasonal fly box, a few confidence nymphs or streamers, and enough tippet to change when flow, clarity, temperature, or pressure changes.