Grande Ronde River at Troy

Last updated: Jul 5, 2025, 2:20 PM UTC

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

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

Scale to Flood Categories

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Observed (OBS) 07/05/2025 6:00 AM PDT

Official Forecast (FCST) 07/04/2025 9:10 AM PDT

Low Threshold: 0 ft

CATEGORY STAGE

Major Flooding 12 ft

Moderate Flooding 11 ft

Minor Flooding 10 ft

Action 8 ft

Reliability of the Forecast:

NOTE: Forecasts are issued routinely year-round.
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	CATEGORY	STAGE
	Major Flooding	12 ft
	Moderate Flooding	11 ft
	Minor Flooding	10 ft
	Action	8 ft

Flood Impacts 🅘

16 - Flooding along the left bank into the town of Troy.
11 - Extensive flooding of fields around Troy are possible, but no residences are threatened.
10 - Minor flooding of fields adjacent to the river from Elgin through Troy and downstream to the confluence of the Snake River.

Gauge Info

Coordinates	45.9457, -117.451
RFC	NWRFC
State	OR
WFO	PDT
County	Wallowa
Data Provider(s)
US Geological Survey	USGS--Water Resources of the United States
USGS	13333000

Gauge Location

Recent Crests

1.	11.73 ft	on 02-07-2020
2.	11.85 ft	on 03-10-2014
3.	10.30 ft	on 01-17-2011
4.	10.83 ft	on 06-05-2010
5.	10.44 ft	on 04-14-2002

Historic Crests

1.	13.76 ft	on 02-09-1996
2.	12.65 ft	on 01-01-1997
3.	11.85 ft	on 03-10-2014
4.	11.73 ft	on 02-07-2020
5.	11.70 ft	on 03-19-0017

Vertical Datum Table

type	NGVD29
major Flooding	1597.98 ft
moderate Flooding	1596.98 ft
minor Flooding	1595.98 ft
action	1593.98 ft
Latest Value	1590.00 ft
Gauge Zero	1585.98 ft

Gauge Photos

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Probability Information

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Weekly Chance of Exceeding Levels
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Chance of Exceeding Levels During Entire Period
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Short Range Forecast Uncertainty
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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

Hydrologic Resource Links

Additional Resource Links

WFO Information

Weather Forecast Office

Pendleton

2001 NW 56th Drive

Pendleton, OR 97801

(541) 276-7832

Ask Questions/Webmaster

Official Homepage

1.	11.73 ft	on 02-07-2020
2.	11.85 ft	on 03-10-2014
3.	10.30 ft	on 01-17-2011
4.	10.83 ft	on 06-05-2010
5.	10.44 ft	on 04-14-2002
6.	9.51 ft	on 05-26-1998
7.	12.65 ft	on 01-01-1997
8.	13.76 ft	on 02-09-1996
9.	10.36 ft	on 02-02-1995
10.	9.10 ft	on 05-19-1991
11.	9.93 ft	on 02-23-1986
12.	9.30 ft	on 02-21-1982
13.	9.00 ft	on 01-17-1974
14.	8.48 ft	on 03-18-1972
15.	10.34 ft	on 01-29-1965
16.	11.25 ft	on 12-23-1964
17.	10.43 ft	on 12-22-1955
18.	9.60 ft	on 05-27-1948
19.	10.20 ft	on 12-15-1946
20.	11.70 ft	on 03-19-0017

1.	13.76 ft	on 02-09-1996
2.	12.65 ft	on 01-01-1997
3.	11.85 ft	on 03-10-2014
4.	11.73 ft	on 02-07-2020
5.	11.70 ft	on 03-19-0017
6.	11.25 ft	on 12-23-1964
7.	10.83 ft	on 06-05-2010
8.	10.44 ft	on 04-14-2002
9.	10.43 ft	on 12-22-1955
10.	10.36 ft	on 02-02-1995
11.	10.34 ft	on 01-29-1965
12.	10.30 ft	on 01-17-2011
13.	10.20 ft	on 12-15-1946
14.	9.93 ft	on 02-23-1986
15.	9.60 ft	on 05-27-1948
16.	9.51 ft	on 05-26-1998
17.	9.30 ft	on 02-21-1982
18.	9.10 ft	on 05-19-1991
19.	9.00 ft	on 01-17-1974
20.	8.48 ft	on 03-18-1972