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:

Apr 23 2024 at 7:52 AM PDT

Next Issuance:

Apr 24 2024 at 9:00 AM PDT

Monitor Stage: N/A

Flood Stage: 7.5 Feet

Plot Type:

Please Note: 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.

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

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022	2,430	6.25	Oct 25, 2021
2021	1,410	5.02	May 7, 2021
2020	2,160	5.96	Apr 30, 2020
2019	4,240	7.79	Jun 13, 2019
2018	8,060	10.09	Apr 7, 2018
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

Impacts - E19 Information
7.0 Feet	Campgrounds at North Pines and Lower Pines begin to flood.
7.5 Feet	Housekeeping Camp and Yosemite Valley Backpacker Campground begin to flood.
10.0 Feet	Northside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan Crossover, and Sentinel Crossover are impassible to vehicles.
13.27 Feet	Flood of record - January 2, 1997. $178M in damage to Yosemite Valley.

Official 7 Day National Weather Service Forecast (CAZ324)

Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Lows 42 to 48. West winds up to 5 mph shifting to the northeast after midnight.

Wednesday: Mostly sunny in the morning then becoming mostly cloudy. Chance of rain showers and slight chance of thunderstorms. Highs 52 to 64. West winds up to 5 mph shifting to the southwest 5 to 15 mph in the afternoon. Chance of precipitation 40 percent.

Wednesday Night: Mostly cloudy. Lows 39 to 45. West winds up to 5 mph.

Thursday: Partly sunny. Highs 50 to 60. Southwest winds up to 5 mph shifting to the west 5 to 15 mph in the afternoon.

Thursday Night: Mostly cloudy. Lows 39 to 45. West winds up to 10 mph.

Friday: Partly sunny. Chance of rain showers in the afternoon. Highs 45 to 55. Chance of showers 40 percent.

Friday Night: Colder. Mostly cloudy in the evening then clearing. Lows 32 to 38.

Saturday and Saturday Night: Mostly clear. Highs 52 to 62. Lows 37 to 43.

Sunday: Sunny. Highs 57 to 67.

Sunday Night: Mostly clear. Lows 40 to 46.

Monday: Sunny. Highs 60 to 70.

Monday Night and Tuesday: Mostly clear. Lows 42 to 48. Highs 60 to 70.

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.