Marys River near Philomath

Last updated: Jun 14, 2025, 2:25 AM UTC

No watches, warnings or advisories are in effect for this area.

Upstream gauge unavailable

Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.

US Geological Survey
Observations courtesy of U.S. Geological Survey

Scale to Flood Categories

Auto Refresh

Traces and Thresholds Click to turn on/off display

Observed (OBS) 06/13/2025 6:00 PM PDT

Official Forecast (FCST) 06/13/2025 8:18 AM PDT

Record: 21.5 ft

Low Threshold: 0 ft

CATEGORY STAGE

Major Flooding 21.5 ft

Moderate Flooding 21 ft

Minor Flooding 20 ft

Action 16 ft

Reliability of the Forecast:

NOTE: Forecasts are issued routinely year-round.
Auto Refresh

	CATEGORY	STAGE
	Major Flooding	21.5 ft
	Moderate Flooding	21 ft
	Minor Flooding	20 ft
	Action	16 ft

Flood Impacts 🅘

21.8 - expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be impassable. The flow at this level is about 15,000 cfs and has a 2 percent chance of happening in a given year (aka 50-year flood).
21.4 - expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be impassable. The flow at this level is about 10,900 cfs, which has a 10 percent chance of happening in a given year (aka 10-year flood).
21.25 - expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be flooded. The flow at this level is about 9,000 cfs and has a 20 percent chance of happening in a given year (aka 5-year flood)

Gauge Info

Coordinates	44.5250, -123.335
RFC	NWRFC
State	OR
WFO	PQR
County	Benton
Data Provider(s)
US Geological Survey	USGS--Water Resources of the United States
USGS	14171000

Gauge Location

Recent Crests

1.	21.02 ft	on 01-03-2022	(P)
2.	20.95 ft	on 12-21-2021	(P)
3.	19.36 ft	on 04-08-2019
4.	21.21 ft	on 11-25-2016
5.	21.10 ft	on 12-18-2015

Historic Crests

1.	21.53 ft	on 01-19-2012
2.	21.21 ft	on 11-25-2016
3.	21.10 ft	on 12-18-2015
4.	21.07 ft	on 12-30-2005
5.	21.03 ft	on 12-03-2007

Vertical Datum Table

type	NGVD29
major Flooding	245.51 ft
moderate Flooding	245.01 ft
minor Flooding	244.01 ft
action	240.01 ft
Latest Value	226.47 ft
Gauge Zero	224.01 ft

Gauge Photos

Photo 1 of 3

Downstream view

Probability Information

Photo 1 of 3

Weekly Chance of Exceeding Levels
- About this graph
Chance of Exceeding Levels During Entire Period
- About this graph
Short Range Forecast Uncertainty
About this graph | Product Description Document

Unique Local Info

10-day Forecast/Trend, Northwest River Forecast Center

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

Resources

WFO Information

Weather Forecast Office

Portland

5241 NE 122nd Avenue

Portland, OR 97230-1089

(503) 261-9246

Ask Questions/Webmaster

Official Homepage

1.	21.02 ft	on 01-03-2022	(P)
2.	20.95 ft	on 12-21-2021	(P)
3.	19.36 ft	on 04-08-2019
4.	21.21 ft	on 11-25-2016
5.	21.10 ft	on 12-18-2015
6.	20.53 ft	on 12-22-2014
7.	20.55 ft	on 11-20-2012
8.	20.62 ft	on 03-31-2012
9.	20.10 ft	on 03-15-2012
10.	21.53 ft	on 01-19-2012
11.	21.03 ft	on 12-03-2007
12.	21.07 ft	on 12-30-2005
13.	20.69 ft	on 12-28-2005
14.	20.85 ft	on 12-28-1998
15.	20.80 ft	on 02-07-1996
16.	20.80 ft	on 12-14-1995
17.	20.50 ft	on 02-17-1995
18.	20.30 ft	on 01-14-1995
19.	20.30 ft	on 02-23-1986
20.	20.40 ft	on 02-13-1984
21.	20.89 ft	on 12-16-1982
22.	20.22 ft	on 02-20-1982
23.	20.11 ft	on 01-23-1982
24.	20.90 ft	on 12-06-1981
25.	20.86 ft	on 12-25-1980
26.	20.50 ft	on 06-13-1980
27.	20.61 ft	on 12-15-1977
28.	20.30 ft	on 12-04-1975
29.	20.91 ft	on 01-15-1974
30.	20.80 ft	on 01-21-1972
31.	20.68 ft	on 01-16-1971
32.	20.27 ft	on 01-25-1970
33.	20.30 ft	on 06-28-1967
34.	20.50 ft	on 06-03-1966
35.	20.50 ft	on 03-09-1966
36.	20.60 ft	on 06-28-1965
37.	20.72 ft	on 12-22-1964
38.	20.40 ft	on 06-19-1964
39.	20.50 ft	on 02-10-1961
40.	20.50 ft	on 02-24-1960
41.	20.40 ft	on 02-09-1960
42.	20.50 ft	on 06-09-1959
43.	20.50 ft	on 06-04-1956
44.	20.80 ft	on 12-21-1955
45.	20.50 ft	on 06-18-1953
46.	20.40 ft	on 02-19-1949
47.	20.40 ft	on 02-10-1949
48.	20.40 ft	on 06-07-1948
49.	20.50 ft	on 12-05-1946
50.	20.50 ft	on 06-01-1943
51.	20.40 ft	on 02-06-1943
52.	20.30 ft	on 01-01-1938	¹

1.	21.53 ft	on 01-19-2012
2.	21.21 ft	on 11-25-2016
3.	21.10 ft	on 12-18-2015
4.	21.07 ft	on 12-30-2005
5.	21.03 ft	on 12-03-2007
6.	21.02 ft	on 01-03-2022	(P)
7.	20.95 ft	on 12-21-2021	(P)
8.	20.91 ft	on 01-15-1974
9.	20.90 ft	on 12-06-1981
10.	20.89 ft	on 12-16-1982
11.	20.86 ft	on 12-25-1980
12.	20.85 ft	on 12-28-1998
13.	20.80 ft	on 01-21-1972
14.	20.80 ft	on 12-21-1955
15.	20.80 ft	on 12-14-1995
16.	20.80 ft	on 02-07-1996
17.	20.72 ft	on 12-22-1964
18.	20.69 ft	on 12-28-2005
19.	20.68 ft	on 01-16-1971
20.	20.62 ft	on 03-31-2012
21.	20.61 ft	on 12-15-1977
22.	20.60 ft	on 06-28-1965
23.	20.55 ft	on 11-20-2012
24.	20.53 ft	on 12-22-2014
25.	20.50 ft	on 06-04-1956
26.	20.50 ft	on 06-03-1966
27.	20.50 ft	on 02-17-1995
28.	20.50 ft	on 03-09-1966
29.	20.50 ft	on 06-18-1953
30.	20.50 ft	on 12-05-1946
31.	20.50 ft	on 02-10-1961
32.	20.50 ft	on 02-24-1960
33.	20.50 ft	on 06-09-1959
34.	20.50 ft	on 06-13-1980
35.	20.50 ft	on 06-01-1943
36.	20.40 ft	on 02-09-1960
37.	20.40 ft	on 02-06-1943
38.	20.40 ft	on 06-07-1948
39.	20.40 ft	on 02-10-1949
40.	20.40 ft	on 02-19-1949
41.	20.40 ft	on 06-19-1964
42.	20.40 ft	on 02-13-1984
43.	20.30 ft	on 01-01-1938	¹
44.	20.30 ft	on 01-14-1995
45.	20.30 ft	on 02-23-1986
46.	20.30 ft	on 12-04-1975
47.	20.30 ft	on 06-28-1967
48.	20.27 ft	on 01-25-1970
49.	20.22 ft	on 02-20-1982
50.	20.11 ft	on 01-23-1982
51.	20.10 ft	on 03-15-2012
52.	19.36 ft	on 04-08-2019