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:

Jan 04 2026 at 12:08 PM PST

Next Issuance:

Jan 05 2026 at 9:00 AM PST

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
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025	4,950	7.17	Apr 01, 2025
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
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
1938	7,620	7.27	Apr 22, 1938

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)

Today: Mostly cloudy with a 30 percent chance of rain and snow. Snow level 4300 feet. Highs in the mid 30s to mid 40s. Southwest winds 10 to 15 mph.

Tonight: Mostly cloudy. Chance of rain and snow in the evening, then snow likely after midnight. Snow level 3800 feet. Snow accumulation up to 1 inch. Lows in the mid 20s to lower 30s. South winds 5 to 10 mph. Chance of precipitation 60 percent.

Monday: Snow in the morning, then rain and snow likely in the afternoon. Snow level 4300 feet in the afternoon. Snow accumulation of 1 to 2 inches. Highs in the mid 30s to lower 40s. South winds around 5 mph. Chance of precipitation 80 percent.

Monday Night: Mostly cloudy. A 20 percent chance of rain and snow in the evening. Snow level 3800 feet. Lows in the mid 20s to lower 30s. South winds around 5 mph.

Tuesday: Mostly cloudy. Chance of snow in the morning, then chance of rain and snow in the afternoon. Snow level 4200 feet in the afternoon. Highs in the mid 30s to lower 40s. Southwest winds 5 to 10 mph. Chance of precipitation 30 percent.

Tuesday Night: Mostly cloudy with a chance of rain and snow. Lows in the lower 20s to lower 30s.

Wednesday and Wednesday Night: Mostly cloudy with snow likely. Highs in the mid 30s to lower 40s. Lows in the lower 20s to lower 30s.

Thursday: Mostly cloudy with a chance of snow. Highs in the mid 30s.

Thursday Night: Mostly cloudy. Slight chance of snow in the evening. Lows 15 to 20.

Friday: Mostly cloudy in the morning then clearing. Highs in the mid 30s to lower 40s.

Friday Night: Mostly clear in the evening then becoming partly cloudy. Lows 15 to 20.

Saturday: Partly cloudy. Highs in the lower to mid 40s.

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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