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 25 2024 at 8:44 AM PDT

Next Issuance:

Apr 26 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: Cloudy. Slight chance of rain showers early in the evening, then chance of rain showers in the late evening and overnight. Lows 38 to 44. Southwest winds up to 10 mph. Chance of showers 40 percent.

Friday: Chance of rain showers and slight chance of thunderstorms in the morning, then rain showers likely and chance of thunderstorms in the afternoon. Highs 44 to 54. Southwest winds up to 15 mph. Chance of precipitation 60 percent.

Friday Night: Partly cloudy. Lows 32 to 38. Northwest winds up to 10 mph shifting to the northeast after midnight.

Saturday: Not as cool. Sunny. Highs 53 to 63. Northeast winds up to 5 mph shifting to the west in the afternoon.

Saturday Night: Mostly cloudy in the evening then clearing. Lows 39 to 45. West winds 5 to 10 mph shifting to the northeast after midnight.

Sunday and Sunday Night: Mostly clear. Highs 57 to 67. Lows 40 to 46.

Monday through Tuesday: Clear. Highs 61 to 75. Lows 44 to 50.

Tuesday Night through Wednesday Night: Mostly clear. Lows 44 to 51. Highs 65 to 75.

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.