Wade76/100
Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
All California reports
Fly fishing report · West
Merced River
Is Merced River worth the trip today? Check flow, weather, hatches, access, and rules for California before you go.
See the flow chart ↓Photo: Kylir Horton from Eagle Mountain, Utah, United States Opens in a new tab. · CC BY 2.0
Good day to fish?Latest river check
Good
Yes. It looks worth the trip.
76
No clear best access mode. Wade, Bank / edge, and Float have the same top score. Use current access, footing, weather, and local rules to choose.
See update time and confidence
Live data checkHighHow much of the live flow, weather, and alert data came back.
Today's callHighCurrent flow, weather, alerts, and trip-critical signals support this decision.
Score calculated Aug 22, 2026, 7:36 PM PDTUsually checks again about every 45 minutes
Access choicesNo clear best mode
Wade, Bank / edge, and Float have the same top score. Use current access, footing, weather, and local rules to choose.
Bank / edge76/100
Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
Float76/100
A float is in play where this report supports boat access and wind, releases, and shuttle logistics are manageable.
Your plan
Today's Merced River plan.
The Merced changes character from Yosemite headwater scenery to lower canyon and anadromous habitat. Rules, access, and fish species change by reach, so this page treats the river as a planning system rather than one uniform trout stream.
- Check first
- Use the Happy Isles or Pohono/Briceburg flow context for the reach you plan to fish.
- Try
- Choose Yosemite, Briceburg/canyon, or lower-river habitat before applying any rule summary.
- Leave when
- 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 rules apply to your exact destination.
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
- 17 cfs
- From the latest stored river check. Open the official source for the newest reading.Water 61.5°F · 24h high 62.8°F · USGS provisional
- Air now
- 94°F
Current NWS forecast period
- Next 24h high
- 101.0°F
NWS air forecast near
- Rain chance
- 1%
For this forecast period
Latest stored weather check
Mostly Clear
Mostly Clear
- Wind
- 5 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
Merced River Briceburg forecast point
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: Merced River at Happy Isles Bridge
Water 61.5°F · provisional · 24h high 62.8°F provisionalWater observed · high observed
How to fish it
How to fish Merced River today.
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 section-by-section rule 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.
Fishing words used on this page
- 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.
- 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.
- Emerger
- An emerger copies an insect as it rises from below the water toward the surface.
- Midge
- Midges are tiny flies and a common trout food, especially in cold water.
- Pale morning dun (PMD)
- Pale morning duns, or PMDs, are light-colored mayflies that often hatch in warmer months.
- Pocket water
- Pocket water is a small calm spot among rocks or fast current.
Why this call
Why this score
FlowUse caution
USGS shows 17 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1916-2025, 110 readings) show a median near 39 cfs and the lower quartile near 21 cfs; today's flow is below normal for the date. This is below normal, so edge depth, temperature, and pressure matter.
SeasonHelps
Late summer: Clear water and terrestrials can work, but heat and low water can limit ethical trout fishing.
Water temperatureHelps
USGS water temperature is about 61.5F, and the rolling 24-hour high did not trigger a heat caution. USGS marks the temperature data provisional and may revise it.
Public alertsHelps
No active NWS alert was returned for this forecast point.
Fishing usefulnessHelps
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.
Trip notes
Trip notes
Check these before you choose a reach.
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.
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 rules apply to your exact destination.
Choose Yosemite if you want cooler scenery-driven pocket water and can work within park rules, or choose the Briceburg area 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.
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.
What to try
Merced 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
Spring
What to look forBWOs, March browns, caddis, stoneflies
Early summer
What to look forPMDs, caddis, yellow sallies, golden stones
SummerCurrent
What to look forCaddis, terrestrials, small mayflies
Fall
What to look forBWOs, midges, October caddis
Each fly name opens its matching Fly Box guide.
Access and safety
Merced River access and rules.
Use these places as starting points. Open the access link below and check posted signs before you park or enter. Verify CDFW section-by-section Merced River rules and Yosemite National Park fishing rules before fishing. Rules differ by dam, bridge, park, and lower-river boundary.
Yosemite Valley and Happy Isles context
Park rules, seasonal access, and runoff conditions matter. Check NPS before fishing.
Pohono Bridge and lower Yosemite context
Useful for flow and park-reach planning, especially during runoff.
Briceburg and BLM canyon access
A major public planning area with campgrounds, road conditions, trails, and heat exposure.
Lower Merced anadromous reaches
Rules can be very different from Yosemite trout water. Use CDFW reach boundaries.
Yosemite National Park rules and CDFW rules are not interchangeable.
Briceburg Road and canyon recreation sites can have closures, reservations, or seasonal issues.
Highway 140 traffic and narrow pullouts require careful parking choices.
Spring water is cold and powerful. Do not wade because the air feels warm.
Lower-river steelhead and salmon habitat should be treated carefully and checked against current rules.
River sources
Official Merced 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 Merced River report is maintained from current Yosemite, BLM, flow, weather, and regulation sources so anglers can separate park water, canyon water, and lower-river habitat context before they start tying knots.
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.
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.
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 more river information and check when it was last updated.
Quick answers
Quick Merced River answers.
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 rules.
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 section-by-section rules separately.