CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

WILLIAMSON RIVER - CHILOQUIN (WMSO3)

Latitude: 42.57º N	Longitude: 121.88º W	Elevation: 4149 Feet
Location: Klamath County in Oregon		Bulletin Group: North Coast		River Group: Klamath

Issuance Time:

Jun 30 2025 at 6:45 AM PDT

Next Issuance:

Jul 01 2025 at 9:00 AM PDT

Action/Monitor: 8.0 Feet

Minor Flood: 9.0 Feet

Moderate Flood: 10.0 Feet

Major Flood: 11.0 Feet

Plot Type:

Please Note:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

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

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	1,860	5.01	Apr 21, 2024
2023	3,630	6.32	Apr 16, 2023
2022	1,040	4.16	Jan 9, 2022
2021	670	3.68	Apr 28, 2021
2020	1,120	4.26	Jan 29, 2020
Historical High Stage/Flow Events (Period of Record - April 1917 to Present) - Ranked by Flow
1997	17,100	10.27	Jan 5, 1997
1964	16,100	10.56	Feb 26, 1964
1982	10,200	8.45	Feb 24, 1982
1970	8,010	7.53	Feb 27, 1970
1943	7,660	7.29	Apr 1, 1943

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
10.0 Feet	Widespread flooding is occurring along the Williamson River from the Highway 97 bridge downstream to Upper Klamath Lake. Widespread farm land flooding is occurring. Numerous structures are flooded.
9.0 Feet	The Williamson River is at flood stage. Water exceeds the channel of the river and begins to impact structures along the river and in low-lying areas near the river.
8.0 Feet	The Williamson River is near bankfull stage. Water is nearing many structures along and enar the river. Water is close to structures at the Water Wheel Campground near Highway 97.

Official 7 Day National Weather Service Forecast (ORZ029)

Tonight: Mostly cloudy with a chance of thunderstorms this evening, then partly cloudy with a slight chance of showers after midnight. Some thunderstorms may produce gusty winds this evening. Lows in the mid 50s to lower 60s. Northwest winds 10 to 15 mph. Chance of precipitation 50 percent.

Tuesday: Partly cloudy in the morning then becoming mostly cloudy. Chance of showers and slight chance of thunderstorms. Some thunderstorms may produce gusty winds. Highs in the mid 80s to lower 90s. North winds 10 to 15 mph. Chance of precipitation 30 percent.

Tuesday Night: Mostly cloudy. A 40 percent chance of thunderstorms in the evening. Some thunderstorms may produce gusty winds in the evening. Lows in the lower 50s to lower 60s. Northwest winds 10 to 15 mph.

Wednesday: Sunny. A 10 percent chance of thunderstorms in the afternoon. Some thunderstorms may produce gusty winds in the afternoon. Highs in the lower to mid 80s. Northwest winds 5 to 10 mph.

Wednesday Night: Mostly clear. A 10 percent chance of showers in the evening. Lows in the mid 40s to lower 50s. Northwest winds 10 to 20 mph decreasing to 5 to 10 mph after midnight.

Thursday: Partly cloudy in the morning, then sunny with a slight chance of showers in the afternoon. Highs in the mid 70s to lower 80s.

Thursday Night through Friday Night: Mostly clear. Lows in the mid 40s to lower 50s. Highs in the mid 70s to lower 80s.

Saturday: Sunny. Highs in the mid 70s to lower 80s.

Saturday Night: Mostly clear. Lows in the mid 40s to lower 50s.

Sunday: Sunny. Highs in the lower to mid 80s.

Sunday Night: Mostly clear. Lows in the mid 40s to mid 50s.

Monday: Sunny. Highs in the mid 80s to lower 90s.

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 Medford 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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