CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)

Latitude: 37.73º N	Longitude: 119.56º W	Elevation: 4017 Feet
Location: Mariposa County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

May 08 2025 at 8:12 AM PDT

Next Issuance:

May 09 2025 at 9:00 AM PDT

Action/Monitor: N/A

Minor Flood: 7.5 Feet

Moderate Flood: 10.0 Feet

Major Flood: 13.27 Feet

Plot Type:

Please Note:
1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View US Geological Survey (USGS) Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	2,980	6.80	May 19, 2024
2023	4,980	8.42	May 23, 2023
2022	2,430	6.25	Oct 25, 2021
2021	1,410	5.02	May 7, 2021
2020	2,160	5.96	Apr 30, 2020
Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
1997	10,100	13.27	Jan 2, 1997
1956	9,840	12.73	Dec 23, 1955
1951	9,260	11.55	Nov 18, 1950

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
13.27 Feet	Flood of Record: 1/2/97. $178 million in damage to Yosemite Valley.
10.0 Feet	Northside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles.
8.2 Feet	Swinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover.
7.5 Feet	Flood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood.
7.0 Feet	North Pines and Lower Pines campgrounds begin flooding.

Official 7 Day National Weather Service Forecast (CAZ324)

Today: Warmer, sunny. Highs 72 to 84. Southeast winds up to 5 mph shifting to the southwest in the afternoon.

Tonight: Mostly clear. Lows 54 to 62. Northeast winds up to 5 mph.

Saturday: Sunny. Highs 74 to 84. East winds up to 5 mph increasing to southwest 10 to 15 mph in the afternoon.

Saturday Night: Mostly clear. Lows 52 to 58. Southwest winds 5 to 10 mph with gusts to around 25 mph shifting to the southeast after midnight.

Sunday: Sunny. Highs 64 to 74. South winds up to 10 mph increasing to southwest 10 to 20 mph in the afternoon.

Sunday Night and Monday: Cooler. Mostly clear. Lows in the mid 40s. Highs 52 to 64.

Monday Night: Colder. Mostly cloudy. Chance of rain in the evening, then chance of rain and snow after midnight. Lows 34 to 40. Chance of precipitation 50 percent.

Tuesday: Partly sunny. Chance of rain showers in the afternoon. Highs 44 to 54. Chance of showers 50 percent.

Tuesday Night: Mostly cloudy in the evening then clearing. Lows 33 to 39.

Wednesday: Not as cool. Sunny. Highs 54 to 64.

Wednesday Night: Partly cloudy. Lows 39 to 45.

Thursday: Sunny. Highs 59 to 69.

Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.

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Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.