CNRFC - Hydrology - River Guidance - Graphical RVF

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

Issuance Time:

Mar 31 2023 at 2:02 PM PDT

Next Issuance:

Apr 01 2023 at 9:00 AM PDT

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: Mostly sunny. Highs 46 to 54. East winds up to 5 mph shifting to the southwest in the afternoon.

Tonight: Mostly clear. Lows in the lower 30s. East winds up to 10 mph.

Sunday: Sunny. Highs 45 to 53. Northeast winds up to 10 mph shifting to the southwest in the afternoon.

Sunday Night: Colder. Mostly cloudy. Chance of snow showers and rain showers after midnight. Lows 22 to 28. Southwest winds 5 to 15 mph. Chance of precipitation 40 percent.

Monday: Colder. Mostly cloudy. Chance of snow in the afternoon. Highs 31 to 39. West winds 5 to 15 mph increasing to 15 to 20 mph in the afternoon. Chance of snow 50 percent.

Monday Night through Tuesday Night: Partly cloudy. Lows 17 to 27. Highs 36 to 44.

Wednesday and Wednesday Night: Partly cloudy. Highs 41 to 49. Lows 27 to 33.

Thursday through Friday: Partly cloudy. Highs 46 to 58. Lows 30 to 36.

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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