Western Flows

Merced River At Happy Isles Bridge

Near Yosemite USGS: 11264500 Provisional Data Last Updated: May 24, 09:56 PM PT

Current Flow

790.0 cfs
Falling

Water Temp

53.4 °F
Safe (< 65°F)

Expected Weather

Temp --°F
Wind -- mph
Rain Chance --%
Pressure -- hPa

Location

Basin: Upper Merced County: Mariposa Elevation: 4,020 ft Drainage Area: 181.0 mi²

System Insights

  • Real-time flow is running well above current model projections. On-the-ground conditions are outpacing the forecast.

Verify access, permits, and local conditions before entering any waterway.

Today's Weather

Forecast Details

Morning

At 6 AM: 57°F and Clear, wind S at 7 mph. By 10 AM: 71°F and Mainly Clear, wind W at 4 mph.

Afternoon/Evening

At 2 PM: 73°F and Clear, wind W at 14 mph. By 6 PM: 72°F and Partly Cloudy, wind W at 6 mph.

Overnight

Dropping from 61°F at 10 PM to 58°F by 4 AM. Conditions Clear with wind S at 5 mph.

3-Day Outlook

🌓 First Quarter

Today, May 24

☁️

74° / 57°

Chance of Rain: 16%
5:41 AM 8:08 PM

Monday, May 25

☁️

71° / 56°

Chance of Rain: 5%
5:41 AM 8:09 PM

Tuesday, May 26

❄️

56° / 41°

Chance of Rain: 15%
5:40 AM 8:10 PM

Flow Trend & 7-Day Forecast

Source: USGS

The current cfs of 790 CFS is running below the historical median of 1,270 CFS for this date, indicating lower-than-average seasonal water levels.

Current (CFS)
7-Day Forecast
Historical Median

7-Day Water Temperature (°F)

Source: USGS
Current (°F)
Historical Median
68°F Threshold

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Glossary & Methodology

Cubic Feet per Second (CFS)

The standard measure for streamflow. One CFS is equal to one cubic foot of water flowing past a specific point in one second (about 7.48 gallons).

Acre-Foot (AF)

The volume of water needed to cover one acre of land to a depth of one foot. One acre-foot is exactly 325,851 gallons.

Snow Water Equivalent (SWE)

The amount of water contained within the snowpack. It can be thought of as the depth of water that would theoretically result if you melted the entire snowpack instantaneously.

Data Sources

Live metrics and historical medians are aggregated directly from the US Geological Survey (USGS), California Data Exchange Center (CDEC), and National Resources Conservation Service (NRCS). Daily flow statistics represent provisional records and are subject to agency revision.