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Advanced Hydrologic Prediction Service
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This probabilistic forecast is issued by the California Nevada River Forecast Center.
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Experimental Short Range Forecast Uncertainty (AHPS) - External Links: Product Description Document | Customer Survey
About this graph
Forecasts for the Merced River at Happy Isles are issued routinely year-round.
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Downstream Gauge Downstream Gauge - at Pohono Bridge
Zoom Level:13
Flood Categories (in feet)
Major Flood Stage: 13.27
Moderate Flood Stage: 10
Flood Stage: 7.5
Action Stage: 0
Low Stage (in feet): -9999

Historic Crests
(1) 13.27 ft on 01/02/1997
(2) 12.73 ft on 12/23/1955
(3) 11.55 ft on 11/18/1950
(4) 8.37 ft on 05/21/2023 (P)

(P): Preliminary values subject to further review.

Recent Crests
(1) 8.37 ft on 05/21/2023 (P)
(2) 13.27 ft on 01/02/1997
(3) 12.73 ft on 12/23/1955
(4) 11.55 ft on 11/18/1950

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
13.27 Flood of Record: 1/2/97. $178 million in damage to Yosemite Valley.
10 Northside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles.
8.2 Swinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover.
7.5 Flood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood.
7 North Pines and Lower Pines campgrounds begin flooding.

Other Real-time and/or Archive Data Sources:

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
San Joaquin Valley Weather Forecast Office
900 Foggy Bottom Road
Hanford, CA 93230-5236
(559) 584-3752
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Page last modified: 2-Nov-2020 7:27 PM
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