Wade · Best fit68/100
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 · West
Mattole River at Petrolia
Mattole River at Petrolia planning with RiverReports flow, official USGS backing, CDFW regulation checks, NWS weather, access notes, hatch timing, fly picks, and practical safety guidance.
Check flow & weatherToday's river scoreLive calculation
68
Caution
Best option: Wade.
Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
Returned dataHigh reliabilityReliability of the flow, weather, and alert data that returned.
Today's decisionMedium confidenceWater temperature not verified; do not use this score to clear warm-water risk.
Score calculated Aug 10, 12:42 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 / edge68/100
Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
Float68/100
A float is in play where this report supports boat access and wind, releases, and shuttle logistics are manageable.
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
Treat this as a regulation-first coastal river day.
Mattole River at Petrolia is a North Coast anadromous river where legal status, low-flow rules, and storm timing decide whether a fly day makes sense. Use the live gauge, CDFW low-flow page, and local weather before thinking about flies.
- Use RiverReports for a quick chart and 11469000 for official USGS context.
- CDFW low-flow status, USGS Petrolia flow, King Range road conditions, and coastal weather
- BLM King Range directions identify the Petrolia and Mattole Beach approach, but anglers should verify current road, parking, and land conditions before fishing.
- Carry a valid California license and steelhead report card when the target requires it.
Why this score moved
FlowUse caution
USGS shows 17 cfs with a stable over about 6 hours trend. same-date USGS history (1912-2025, 77 readings) puts normal around 41 cfs and the low-water marker near 25 cfs; today's flow is unusually low for the date. Low water can make fish spooky, warm, pressured, or concentrated; check temperature and handling risk.
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
Summer: Often more of a scouting, warmwater, surf, or estuary-adjacent planning season than a trout or steelhead season.
WeatherHelps score
The NWS forecast is about 55F with Mostly Clear.
Public alertsHelps score
No active NWS alert was returned for this forecast point.
Read the water
What changes the plan.
Best windows come after the river is open under CDFW low-flow rules and the hydrograph is dropping into fishable shape. Skip Mattole River at Petrolia during closures, muddy storm pulses, hot low water, or unclear access conditions.
Dropping lower-river flow
Most useful after storms when the river clears and remains open.
Bar and estuary influence
Lower-river water can behave differently than the upper gauge plan.
Road-impact storms
Skip when roads, crossings, or wind make travel questionable.
Closed or too low
Follow CDFW low-flow updates and leave salmonids alone.
Field plan
Fish it with intention.
Best flows
Open under CDFW low-flow rules, dropping after rain, and clear enough to fish without stressing salmonids.
When to skip
Skip during closures, muddy storm spikes, hot low water, or when access depends on private-land assumptions.
Local plan
Petrolia or Ferndale approach is the practical base. Check cdfw low-flow status, usgs petrolia flow, king range road conditions, and coastal weather, then pick a short legal access plan instead of trying to cover the whole river.
Backup water
Check nearby BlueStreamFly reports if the gauge, rules, or weather do not fit the plan.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
WinterSparse midges, winter stones, salmonid eggs where legal, and baitfish movementSmall black stone, egg pattern where legal, soft hackle, black leech, small baitfish
Reviewed family · report says “Small black stone”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 ↗
Reviewed family · report says “egg pattern where legal”Egg Fly PatternsEgg flies are tied to the hook. Round clipped-yarn eggs, sparkly chenille eggs, veiled eggs, single eggs, and clusters differ in material and silhouette; pegged or free-sliding beads are rigs, not fly patterns.See family guide ↗+ 3 more reviewed guides in the Fly Box SpringBWOs, caddis, small mayflies, sculpins, and fry movementBWO emerger, caddis pupa, soft hackle, sculpin, small clouser
Reviewed family · report says “BWO emerger”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 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 SummerTerrestrials, caddis, midges, warmwater forage, and estuary baitFoam ant, small caddis, popper, baitfish streamer, crayfish
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 “small caddis”Caddis Patterns by StageCaddis is not one fly. Larvae live below, pupae and emergers rise through the column, tent-wing adults ride or move on top, and spent forms create other silhouettes.See family guide ↗+ 3 more reviewed guides in the Fly Box FallFirst rain pulses, small olives, caddis, and salmonid migration cuesSoft hackle, BWO, small streamer, muddler, sparse steelhead wet fly
Reviewed family · report says “Soft hackle”Soft-Hackle Wet FliesA slim body and sparse webby feather collar define the family. Body material, tail, bead, and insect-specific color create different named patterns.See family guide ↗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 ↗+ 3 more reviewed guides in the Fly Box 01
Check open status before leaving home, then match the gauge to clarity when you arrive.
02
Swing sparse flies or small streamers through soft traveling lanes only when the river is legal and fishable.
03
Avoid redds, staging fish, and crowded slots; these rivers depend on careful handling.
04
Keep a backup plan because coastal rivers can close or blow out quickly.
Access & responsibility
Know the entry. Know the exit.
Check CDFW low-flow rules, current sport fishing regulations, and steelhead report-card requirements before fishing. Open status can change during the season.
Petrolia area
Remote lower-river planning base; confirm parking and land status.
Mattole Beach / King Range
Use BLM current condition and road information before committing.
Lower river bars
Change after storms and can be private or unsafe.
Recent reach reports
What anglers are seeing.
Moderated, river-level updates for Mattole River at Petrolia. Exact spots, private access notes, and private media never appear here.
No verified reach reports yet.
Be the first to share a generalized river update through the moderated BSF app flow.
Transparent sources
Check the facts behind the plan.
Editorial guidance reviewed . This date applies to access, hatches, tactics, and source notes—not today's conditions.
Active maintenance check: . BlueStreamFly checks report sources, links, live fishability inputs, and page rendering on a recurring maintenance schedule. This check does not change the material review date unless public guidance or sources changed.
These links answer different trip questions. A reviewed source is a place to verify the decision; it is not a promise that the river, access, or season is open. Source review dates are separate from today's live fishing score.
Source coverage: Flow — verify before leaving; Weather — reviewed source; Public access — reviewed source; Fishing rules — reviewed source; Emergency notices — reviewed source; Conservation contact — source status unknown.
Emergency noticeCalifornia Department of Fish and Wildlife emergency or current-status authority
California Department of Fish and Wildlife · Supports emergency closures
Reviewed in this Sourcebook release · Checked · Review window through · Statewide source: California
Limit: A status page is not proof that this river is open. Match any notice to the named water, reach, species, and effective time. The closures page spans multiple fishery and emergency actions; only an entry naming the affected water or reach establishes a closure.Opens the official source in a new tab.Fishing rulesCalifornia Department of Fish and Wildlife fishing regulations
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Statewide source: California
Limit: Official regulations remain the legal authority; this directory does not summarize or certify the rules for a reach. The closures page spans multiple fishery and emergency actions; only an entry naming the affected water or reach establishes a closure.Opens the official source in a new tab.Fishing rulesCDFW low-flow fishing regulations
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: The official rule text controls; this directory does not infer legal methods, seasons, species rules, or open status. This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Fishing rulesCDFW steelhead report and restoration card
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: The official rule text controls; this directory does not infer legal methods, seasons, species rules, or open status. This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Flow gaugeMATTOLE R NR PETROLIA CA
United States Geological Survey Water Data · Supports flow conditions
Verify with the authority · Checked · Report reach: Mattole River at Petrolia report reach
Limit: The configured station 11469000 is the single USGS station ID documented by the report's official flow sources. The official station is available, but BlueStreamFly has not recorded a documented reach-level mapping review.Opens the official source in a new tab.Public accessBLM King Range National Conservation Area
Bureau of Land Management · Supports public access
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Weather forecastNWS forecast for Mattole River at Petrolia
National Weather Service · Supports weather forecast
Reviewed in this Sourcebook release · Checked · Review window through · Reviewed point: Mattole River at Petrolia forecast point
Limit: Approximate forecast point only. It is not an access coordinate, river gauge, measured rainfall record, or fishing location.
Forecast-only point — not public access 40.3132, -124.2834 · BlueStreamFly-reviewed coordinates checked · Reviewed by BlueStreamFly Editorial Team · Coordinate source bluestreamfly.com
Coordinate limit: Canonical report forecast point; never use or display this coordinate as public access.Opens the official source in a new tab.
California Department of Fish and Wildlife · Supports emergency closures
Reviewed in this Sourcebook release · Checked · Review window through · Statewide source: California
Limit: A status page is not proof that this river is open. Match any notice to the named water, reach, species, and effective time. The closures page spans multiple fishery and emergency actions; only an entry naming the affected water or reach establishes a closure.Opens the official source in a new tab.Fishing rulesCalifornia Department of Fish and Wildlife fishing regulations
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Statewide source: California
Limit: Official regulations remain the legal authority; this directory does not summarize or certify the rules for a reach. The closures page spans multiple fishery and emergency actions; only an entry naming the affected water or reach establishes a closure.Opens the official source in a new tab.Fishing rulesCDFW low-flow fishing regulations
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: The official rule text controls; this directory does not infer legal methods, seasons, species rules, or open status. This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Fishing rulesCDFW steelhead report and restoration card
California Department of Fish and Wildlife · Supports fishing rules
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: The official rule text controls; this directory does not infer legal methods, seasons, species rules, or open status. This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Flow gaugeMATTOLE R NR PETROLIA CA
United States Geological Survey Water Data · Supports flow conditions
Verify with the authority · Checked · Report reach: Mattole River at Petrolia report reach
Limit: The configured station 11469000 is the single USGS station ID documented by the report's official flow sources. The official station is available, but BlueStreamFly has not recorded a documented reach-level mapping review.Opens the official source in a new tab.Public accessBLM King Range National Conservation Area
Bureau of Land Management · Supports public access
Reviewed in this Sourcebook release · Checked · Review window through · Report reach: Mattole River at Petrolia report reach
Limit: This link was reviewed with the canonical report. Recheck the source, posted signs, affected reach, and effective date before relying on it.Opens the official source in a new tab.Weather forecastNWS forecast for Mattole River at Petrolia
National Weather Service · Supports weather forecast
Reviewed in this Sourcebook release · Checked · Review window through · Reviewed point: Mattole River at Petrolia forecast point
Limit: Approximate forecast point only. It is not an access coordinate, river gauge, measured rainfall record, or fishing location.
Forecast-only point — not public access 40.3132, -124.2834 · BlueStreamFly-reviewed coordinates checked · Reviewed by BlueStreamFly Editorial Team · Coordinate source bluestreamfly.com
Coordinate limit: Canonical report forecast point; never use or display this coordinate as public access.Opens the official source in a new tab.
Other report references: These support editorial context but are not presented as reviewed official authorities in the Sourcebook.
flowRiverReports: Mattole River near PetroliaOpens this reference in a new tab.backgroundCDFW North Coast Salmon ProjectOpens this reference in a new tab.backgroundBLM lower Mattole restorationOpens this reference in a new tab.backgroundGenerated regional Mattole River at Petrolia planning imageOpens this reference in a new tab.
See this river in the Official River Sourcebook
Something changed? Report a source or reach correction. Send public-source corrections only. Do not submit private access notes, exact private spots, pins, marker IDs, user IDs, photo locations, or private media.
Common questions
Before you leave.
Is Mattole River at Petrolia usually open for fly fishing?+
Do not assume it is open. North Coast low-flow rules and salmonid protections can close these waters when flows are too low or conditions are stressful.
Should I wade or float?+
Wading from legal access is usually the safer planning baseline. Floating requires current local access knowledge, safe flow, and a realistic takeout.
Which flow source should I use?+
Use the RiverReports chart for a fast read and USGS 11469000 as the official flow source or context source.