WadeNot advised
Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
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Fly fishing report · West
Merced River
A Merced River report for Yosemite-to-Briceburg planning, reach-specific regulations, spring runoff safety, BLM access, hatch timing, and practical flies.
Check flow & weatherToday's fishing decisionMost live data available
62
Use caution
Merced River is a cautious call right now.
Current USGS flow is 35 cfs and has been stable for about 6 hours. Today's flow is below the normal seasonal range, which begins near 53 cfs. This is below normal, so edge depth, temperature, and pressure matter.
Best supported approachFloat
Watch nextFlow: Current USGS flow is 35 cfs and has been stable for about 6 hours. Today's flow is below the normal seasonal range, which begins near 53 cfs.
Updated Aug 3, 1:24 AM UTCUsually refreshes about every 45 minutes
Best supported approachFloat
Compare wading, bank fishing, and floating before choosing how you will fish.
Bank / edge54/100
Bank and edge fishing is the safer default when water is high, pushy, or not fully verified.
Float · Best fit66/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Check before you drive
Current flow and weather.
Look at whether the river is rising or falling, then check wind, rain, and storms. These can change both safety and fishing.
Loading current flow and weather.
Before you rely on this report
How current is this report?
Conditions can change quickly. Check these dates before you decide to fish, and open the official source when safety or rules matter.
- River conditions
- Checked Aug 2, 2026, 9:24 PM
- Fishing guidance
- Reviewed May 31, 2026
- Public access
- No reviewed map pin available
- Rules and closures
- Official rule links checked
High confidence in the current score inputs.
7 sources are listed below for you to open.
4 public access records are listed. Private spots are never shown.
Source checked Jul 30, 2026
Plan your access
Know where you can enter.
These are public parking, launch, trail, or recreation areas—not secret fishing spots. We never show an angler's private pins, notes, or photos here.
- 0
- Shown on map
- 4
- No map pin
Location checkedDescription only
01No map pin
Area description
Yosemite Valley and Happy Isles context
Park rules, seasonal access, and runoff conditions matter. Check NPS before fishing.
Restrictions and seasonal notes
Yosemite National Park rules and CDFW rules are not interchangeable.
Briceburg Road and canyon recreation sites can have closures, reservations, or seasonal issues.
02No map pin
Roadside access
Pohono Bridge and lower Yosemite context
Useful for flow and park-reach planning, especially during runoff.
Restrictions and seasonal notes
Yosemite National Park rules and CDFW rules are not interchangeable.
Briceburg Road and canyon recreation sites can have closures, reservations, or seasonal issues.
03No map pin
Public land
Briceburg and BLM canyon access
A major public planning area with campgrounds, road conditions, trails, and heat exposure.
Restrictions and seasonal notes
Yosemite National Park rules and CDFW rules are not interchangeable.
Briceburg Road and canyon recreation sites can have closures, reservations, or seasonal issues.
04No map pin
Area description
Lower Merced anadromous reaches
Rules can be very different from Yosemite trout water. Use CDFW reach boundaries.
Restrictions and seasonal notes
Yosemite National Park rules and CDFW rules are not interchangeable.
Briceburg Road and canyon recreation sites can have closures, reservations, or seasonal issues.
How to fish it
Pick the reach before reading the hatch chart.
The Merced changes character from Yosemite headwater scenery to lower canyon and anadromous habitat. Regulations, access, and fish species change by reach, so this page treats the river as a planning system rather than one uniform trout stream.
- Use the Happy Isles or Pohono/Briceburg flow context for the reach you plan to fish.
- Check Yosemite rules separately from CDFW lower-river regulations.
- Spring runoff can make wading unsafe even when the weather is warm.
- BLM Briceburg-area access is useful, but roads, camping rules, and heat matter.
Why the score looks this way
FlowUse caution
USGS shows 35 cfs with a stable over about 6 hours trend. Today's flow is below the normal seasonal range, which begins near 53 cfs. This is below normal, so edge depth, temperature, and pressure matter.
Public alertUse caution
A heat alert is active near this forecast point, so the score is capped at caution until water temperature and fish-handling risk are checked. NWS alert: Heat Advisory issued August 2 at 1:47PM PDT until August 3 at 11:00PM PDT by NWS Hanford CA.
Best mode nowUse caution
Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
SeasonHelps score
Early summer: Post-peak runoff can open useful trout and hatch windows, especially in cooler reaches.
Water temperatureHelps score
USGS water temperature is about 63F, with no heat stop triggered.
Read the water
What changes the plan.
The Merced is most useful when you match the day to the reach. In Yosemite, think access, park rules, and runoff. In the canyon, think flow, heat, BLM logistics, and CDFW's reach-specific regulation boundaries.
Low clear summer flow
Use stealth, long leaders, small dries, and shade-line presentations. Watch temperature.
Stable spring flow
Nymph edges, softer pockets, and side channels while staying out of dangerous main current.
High runoff
Skip wading. The river can be cold, powerful, and unforgiving during snowmelt.
Hot lower canyon
Fish early, carry water, and stop trout fishing if temperatures or handling conditions are poor.
Your trip plan
Know when to go—and when to skip it.
Best flows
Use the upper-river trend as a warning system more than as a magic target. Once runoff begins to settle, pocket water and softer edges become worth the effort; when snowmelt is still pushing hard or the lower canyon is baking in heat, the best move is often to wait or switch rivers.
When to skip
Skip the Merced during hard spring runoff, when Yosemite or Briceburg access is restricted, when canyon heat makes trout handling suspect, or when you have not sorted out whether park rules or lower-river regulations apply to your exact destination.
Local plan
Choose Yosemite if you want cooler scenery-driven pocket water and can work within park rules, or choose the Briceburg corridor if you want BLM canyon access and accept the hotter, more exposed lower-canyon day. Fish one reach with purpose instead of driving the whole drainage in search of a generic Merced answer.
Backup water
If the Merced is too high, too hot, or too crowded, pivot to Hot Creek for a technical spring-creek day or to the San Joaquin if another reach-aware Sierra freestone plan fits the travel window better.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
SpringBWOs, March browns, caddis, stonefliesBWO emerger, March brown, caddis pupa, stonefly nymph
Fly family · report suggests “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 ↗
Fly family · report suggests “March brown”March Brown Dry FliesThis family includes traditional hackled, parachute, and Comparadun-style March Brown dries. Each exact construction rides differently and should be named when known.See family guide ↗+ 2 more reviewed guides in the Fly Box Early summerPMDs, caddis, yellow sallies, golden stonesPMD dry, elk hair caddis, stimulator, yellow sally nymph
Fly family · report suggests “PMD dry”Pale Morning Dun PatternsPMD names an insect group, not one fly. Pale nymphs, trailing-shuck emergers, upright or low-riding duns, cripples, and spent-wing spinners stay visibly separate.See family guide ↗
Fly pattern · report suggests “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 ↗+ 2 more reviewed guides in the Fly Box SummerCaddis, terrestrials, small mayfliesAnt, beetle, caddis dry, parachute mayfly, small nymph
Fly family · report suggests “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 ↗
Fly family · report suggests “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 ↗+ 3 more reviewed guides in the Fly Box FallBWOs, midges, October caddisBWO, zebra midge, October caddis, soft hackle
Fly family · report suggests “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 ↗
Fly pattern · report suggests “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 ↗+ 2 more reviewed guides in the Fly Box 01
Choose Yosemite, Briceburg/canyon, or lower-river habitat before applying any rule summary.
02
Use the nearest relevant gauge instead of reading one flow number for the whole river.
03
During runoff, fish from the bank and avoid crossings.
04
Look for trout in soft edges, plunge-pool lips, and shaded pocket water.
05
Carry extra water and sun protection in the canyon.
Rules & closures
Check the official rules before you go.
Open the agency page to confirm the exact river section, species, season, tackle rules, limits, and emergency closures.
Official links checkedRules for this river or sectionNo special rule found
We did not find a special rule for this river.
We checked the state source but did not find a clearly supported exception for this river. Check the official rules for the exact section you plan to fish.
Rules checkedJul 30, 2026
Report a correction ↗Always follow the official rule
This summary helps with trip planning. The linked agency rule is the one you must follow.
Updates from anglers
What anglers are seeing.
Recent observations from general areas of Merced River. We review every update before it appears and never publish exact fishing spots, private access details, or photo locations.
Angler updates are not loading right now.
You can still use the river plan above. Check back later for recent observations from other anglers.
Where this report comes from
Open the sources we checked.
Fishing guidance checked: May 31, 2026
Site check: Jul 14, 2026. We regularly test report links, live scores, flow and weather data, and page loading. The content date changes only when the fishing guidance or its sources change.
flowRiverReports: Merced River at Happy Isles BridgeflowUSGS monitoring location: Merced River at Happy Isles BridgeflowNPS Yosemite hydrology dataaccessBLM Merced River Recreation Management AreabackgroundCDFW Merced River drought and steelhead case studyregulationCDFW Title 14 and regulation noticessafetyNational Weather Service forecast point near Merced River canyon
Common questions
Before you leave.
What Merced River reach is best for fly fishing?+
It depends on season and rules. Yosemite and Briceburg/canyon reaches are the main trout-planning anchors, while lower reaches have different anadromous regulations.
What gauge should I check?+
Use Happy Isles, Pohono, or other Merced gauges that match your reach. This page displays the RiverReports Happy Isles gauge for upper-river context.
Is spring runoff dangerous?+
Yes. The Merced can be cold, fast, and unsafe to wade during runoff even on warm days.
Can I use the same rules in Yosemite and below the park?+
No. Check Yosemite National Park rules and CDFW reach-specific rules separately.