National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

*** IMPORTANT ***  Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.
 | 

WILLIAMSON RIVER - CHILOQUIN (WMSO3)
Latitude: 42.57º NLongitude: 121.88º WElevation: 4149 Feet
Location: Klamath County in OregonBulletin Group: North CoastRiver Group: Klamath
Issuance Time: Jun 16 2025 at 6:07 AM PDTNext Issuance: Jun 17 2025 at 9:00 AM PDT
Action/Monitor: 8.0 FeetMinor Flood: 9.0 FeetModerate Flood: 10.0 FeetMajor Flood: 11.0 Feet

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
Gage owner logo

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

Verification - Historical Graphical RVF
Month:  
Day:  
Year:  
Cycle:  
To view other verification locations, use our Historical Graphical River Forecast Interface.
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
ESRI™ Locator Map
Flood Impacts
10.0 FeetWidespread 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 FeetThe 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 FeetThe 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: Sunny. Highs in the lower 70s to lower 80s. North winds around 5 mph shifting to the west early this afternoon, then increasing to 10 to 15 mph late this afternoon.

Tonight: Mostly clear in the evening then becoming partly cloudy. Lows in the mid 30s to lower 40s. Northwest winds 10 to 20 mph shifting to the west 5 to 10 mph after midnight.

Friday: Mostly cloudy in the morning, then partly cloudy with a 20 percent chance of rain showers in the afternoon. Snow level 6000 feet in the afternoon. Highs in the lower 50s to lower 60s. West winds 5 to 10 mph increasing to 10 to 20 mph in the afternoon.

Friday Night: Mostly cloudy. Chance of rain showers in the evening, then slight chance of rain and snow showers after midnight. Snow level 6000 feet lowering to 5000 feet after midnight. Lows in the lower to mid 30s. Northwest winds 10 to 20 mph with gusts to around 35 mph becoming west around 5 mph after midnight. Chance of precipitation 50 percent.

Saturday: Mostly cloudy. Slight chance of rain and snow showers in the morning, then chance of rain showers in the afternoon. Snow level 5500 feet in the afternoon. Highs in the mid 40s to mid 50s. West winds 10 to 15 mph. Chance of precipitation 30 percent.

Saturday Night: Mostly cloudy. Slight chance of rain showers in the evening. Lows in the mid 30s to lower 40s.

Sunday: Mostly cloudy in the morning then becoming partly cloudy. Warmer. Highs in the lower 60s to lower 70s.

Sunday Night and Monday: Mostly clear. Lows in the mid 30s to mid 40s. Highs in the mid 60s to mid 70s.

Monday Night: Partly cloudy in the evening then becoming mostly clear. Lows in the lower 40s to lower 50s.

Tuesday and Tuesday Night: Mostly clear. Highs in the mid 70s to lower 80s. Lows in the lower 40s to lower 50s.

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