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 20 2023 at 2:58 PM PDT

Next Issuance:

Mar 21 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: Windy. Snow in the morning. Rain showers and slight chance of thunderstorms through the day. Snow showers in the afternoon. Snow may be heavy at times in the late morning and afternoon. Snow accumulation up to 9 inches. Snow level 4900 feet. Highs 37 to 45. East winds 5 to 15 mph with gusts to around 35 mph increasing to south 15 to 30 mph with gusts to around 45 mph in the afternoon. Chance of precipitation near 100 percent.

Tonight: Snow and rain in the evening, then snow likely after midnight. Snow may be heavy at times in the evening. Snow accumulation of 2 to 8 inches. 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. Snow accumulation up to 1 inch. Total snow accumulation 2 to 18 inches. Snow level 4100 feet. Highs 37 to 43. Southeast winds 5 to 10 mph shifting to the southwest 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. Southwest winds up to 10 mph shifting to the southeast after midnight.

Thursday: Partly sunny. A 40 percent chance of rain and snow in the afternoon. Highs 36 to 44. South winds up to 5 mph shifting to the southwest in the afternoon.

Thursday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 23 to 29.

Friday: Mostly sunny. Highs 37 to 45.

Friday Night: Mostly cloudy. Lows 20 to 26.

Saturday: Mostly sunny. A 40 percent chance of snow in the afternoon. Highs 35 to 43.

Saturday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 18 to 24.

Sunday: Mostly sunny. Highs 37 to 43.

Sunday Night: Mostly cloudy with a 30 percent chance of snow. Lows 22 to 28.

Monday: Chance of snow in the morning, then chance of snow and rain likely in the afternoon. Light snow accumulations. Highs 36 to 44. Chance of precipitation 60 percent.

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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