CNRFC - Hydrology - Observed River/Reservoir Conditions

MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)

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

Monitor Stage: N/A

Flood Stage: 8.0 Feet

Plot Type:

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
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
2017	5,210	8.45	Jun 20, 2017
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

Official 7 Day National Weather Service Forecast (CAZ324)

Today: Cloudy early in the morning then becoming partly sunny. A 20 percent chance of rain and snow early in the morning. Highs 40 to 48. South winds up to 10 mph.

Tonight: Cloudy. A 30 percent chance of snow after midnight. Lows 29 to 35. East winds up to 10 mph.

Tuesday: Breezy. Rain and chance of snow in the morning, then rain and snow in the afternoon. Snow may be heavy at times in the afternoon. Snow accumulation up to 10 inches. Snow level 4700 feet. Highs 37 to 45. East winds 5 to 15 mph with gusts to around 30 mph increasing to south 15 to 25 mph with gusts to around 40 mph in the afternoon. Chance of precipitation near 100 percent.

Tuesday Night: Snow and rain in the evening, then snow likely after midnight. Snow may be heavy at times in the evening. Heavy snow accumulations. Lows 25 to 31. South winds 10 to 15 mph. Chance of precipitation 90 percent.

Wednesday: Snow likely in the morning, then rain and snow in the afternoon. Moderate snow accumulations. Snow level 4200 feet. Highs 35 to 43. Southeast winds 5 to 15 mph shifting to the southwest 5 to 10 mph in the afternoon. Chance of precipitation 80 percent.

Wednesday Night: Mostly cloudy. A 40 percent chance of rain and snow in the evening. Lows 25 to 31.

Thursday: Partly sunny. A 30 percent chance of rain and snow in the afternoon. Highs 37 to 45.

Thursday Night and Friday: Partly cloudy. Lows 24 to 30. Highs 37 to 45.

Friday Night: Mostly cloudy. Lows 19 to 25.

Saturday: Partly sunny. A 40 percent chance of snow in the afternoon. Highs 35 to 41.

Saturday Night: Mostly cloudy with chance of snow in the evening, then partly cloudy after midnight. Lows 18 to 24. Chance of snow 30 percent.

Sunday: Mostly sunny. A 30 percent chance of snow and rain in the afternoon. Highs 36 to 44.

Impacts - E19 Information
7.0 Feet	Campgrounds at North Pines and Housekeeping Camp begin to flood.
9.5 Feet	Substantial road flooding occurs at Sentinel Crossover, Wosky Pond, and Chapel Meadow. Water is approximately one foot deep on the road through Chapel Meadow.
10.0 Feet	Northside and Southside Drive are impassable to vehicles. Water comes 1.5 feet up the side of the Yosemite Creek Lift Station and 1 to 2 inches above the foundation of pumps that control the Housekeeping Camp Lift Station. Water flows two feet over the "swinging bridge".
13.27 Feet	Flood of record - January 2, 1997.

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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