Merced River A Happy Isles Bridge Near Yosemite flow report
As of July 13, 2026, Merced River A Happy Isles Bridge Near Yosemite is flowing at 129 cfs with a gage height of 2.15 ft. Source: USGS gauge #11264500, refreshed throughout the day.
Historical Data
Merced River A Happy Isles Bridge Near Yosemite at a glance
How Merced River A Happy Isles Bridge Near Yosemite is running right now, where it sits on the map, and the key gauge stats.
Merced River A Happy Isles Bridge Near Yosemite is flowing at 129 cfs, with the water sitting 2.15 ft at the gage.
This is USGS gauge #11264500 in California. Over the past 10 days the average has been 166 cfs, peaking at 198 cfs.
Over the next 5 days, Merced R A Happy Isles Bridge Nr Yosemite Ca is expected to recede from today's 129 cfs, toward roughly 106 cfs by 2026-07-17 (likely range 24-460 cfs) -- drier than normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the California flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Merced River A Happy Isles Bridge Near Yosemite
The river flows through Yosemite National Park, and its tributaries include the Illilouette Creek, Nevada Creek, and Tenaya Creek. The seasonal trends in the river's flow are largely influenced by snowmelt and precipitation, with peak flow typically occurring in May or June. There are several dams along the Merced River, including the Hetch Hetchy Reservoir, which provides water to San Francisco. One quirky fact is that the Merced River was once known as the "River of Mercy" because it provided a lifeline for early settlers in the area.
Nearby streamflow levels
Cross-check Merced River A Happy Isles Bridge Near Yosemite's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Merced R A Happy Isles Bridge Nr Yosemite Ca | 129 cfs |
| Merced R A Pohono Bridge Nr Yosemite Ca | 158 cfs |
| Tuolumne R A Grand Cyn Of Tuolumne Ab Hetch Hetchy | 146 cfs |
| Big C Div Nr Fish Camp Ca | 0 cfs |
| Tuolumne R Nr Hetch Hetchy Ca | 114 cfs |
| Nf Willow C Nr Sugar Pine Ca | 416 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Merced River A Happy Isles Bridge Near Yosemite. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Tenaya Lake | 0 in |
| Nohrsc White Wolf Raws | 0 in |
| Nohrsc Tuolumne Meadows | 124 in |
| Nohrsc Tioga Pass-Dana Meadows | 31 in |
| Nohrsc Green Mtn | 8 in |
| Nohrsc Chilkoot Meadow | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Merced River A Happy Isles Bridge Near Yosemite.
Nearby reservoirs
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Boat launches
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River runs
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River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Merced River A Happy Isles Bridge Near Yosemite in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Merced River A Happy Isles Bridge Near Yosemite crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Merced River A Happy Isles Bridge Near Yosemite
Where does the streamflow data for Merced River A Happy Isles Bridge Near Yosemite come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11264500. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Merced River A Happy Isles Bridge Near Yosemite rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Merced River A Happy Isles Bridge Near Yosemite report
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