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Grande Ronde River at Troy

Highest listed crest 13.76 ftFlood stage 10.0 ft19 crests since 1946

The Grande Ronde River at Troy crested at major flood stage 2 times among the 19 crests the National Weather Service lists from 1946 to 2020. The highest, 13.76 ft on February 9, 1996, was major flooding, 3.76 feet above flood stage.

The gauge

Highest listed crest
13.76 ft
February 9, 1996; 51,800 cubic feet per second
Flood stage
10.0 ft
Major flooding from 12.0 ft
Crests at major
2
36th of 100 gauges in Oregon
Most recent flood crest
February 7, 2020
11.73 ft, moderate flooding
Location
Wallowa County
Oregon

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Grande Ronde River at Troy
Action stage8.07May 26, 1998The level at which the NWS or its partners begin to take action
Flood stage (minor)10.07Jan 17, 2011Minimal or no property damage, but possibly some public threat
Moderate flood stage11.03Feb 7, 2020Some inundation of structures and roads near the stream
Major flood stage12.02Jan 1, 1997Extensive inundation of structures and roads

Every listed crest

19 crests from 1946 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Grande Ronde River at Troy, 1946 to 2020 8101214ft Flood stage 10.0 ftMajor 12.0 ft Dec 15, 1946: 10.20 ft, minor flooding; 30,000 cubic feet per secondMay 27, 1948: 9.60 ft, action stage; 23,600 cubic feet per secondDec 22, 1955: 10.43 ft, minor flooding; 26,400 cubic feet per secondDec 23, 1964: 11.25 ft, moderate flooding; 42,200 cubic feet per secondJan 29, 1965: 10.34 ft, minor flooding; 33,100 cubic feet per secondMar 18, 1972: 8.48 ft, action stage; 20,500 cubic feet per secondJan 17, 1974: 9.00 ft, action stage; 23,300 cubic feet per secondFeb 21, 1982: 9.30 ft, action stage; 24,700 cubic feet per secondFeb 23, 1986: 9.93 ft, action stage; 28,500 cubic feet per secondMay 19, 1991: 9.10 ft, action stage; 22,600 cubic feet per secondFeb 2, 1995: 10.36 ft, minor flooding; 22,200 cubic feet per secondFeb 9, 1996: 13.76 ft, major flooding; 51,800 cubic feet per secondJan 1, 1997: 12.65 ft, major flooding; 36,700 cubic feet per secondMay 26, 1998: 9.51 ft, action stage; 17,800 cubic feet per secondApr 14, 2002: 10.44 ft, minor flooding; 22,600 cubic feet per secondJun 5, 2010: 10.83 ft, minor flooding; 24,900 cubic feet per secondJan 17, 2011: 10.30 ft, minor flooding; 18,100 cubic feet per secondMar 10, 2014: 11.85 ft, moderate floodingFeb 7, 2020: 11.73 ft, moderate flooding; 31,342 cubic feet per second Highest, 13.76 ft, Feb 9, 1996 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Grande Ronde River at Troy 1940s: 1 1950s: 1 1960s: 2 1970s: 0 1980s: 0 1990s: 3 3 2000s: 1 2010s: 3 2020s: 1 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Grande Ronde River at Troy
1Feb 9, 199613.76+3.76Major51,800
2Jan 1, 199712.65+2.65Major36,700
3Mar 10, 201411.85+1.85Moderate—
4Feb 7, 202011.73+1.73Moderate31,342
5Dec 23, 196411.25+1.25Moderate42,200
6Jun 5, 201010.83+0.83Minor24,900
7Apr 14, 200210.44+0.44Minor22,600
8Dec 22, 195510.43+0.43Minor26,400
9Feb 2, 199510.36+0.36Minor22,200
10Jan 29, 196510.34+0.34Minor33,100
11Jan 17, 201110.30+0.30Minor18,100
12Dec 15, 194610.20+0.20Minor30,000
13Feb 23, 19869.93−0.07Action28,500
14May 27, 19489.60−0.40Action23,600
15May 26, 19989.51−0.49Action17,800
16Feb 21, 19829.30−0.70Action24,700
17May 19, 19919.10−0.90Action22,600
18Jan 17, 19749.00−1.00Action23,300
19Mar 18, 19728.48−1.52Action20,500

The worst floods along the Grande Ronde River

For this gauge's highest crests, the other gauges on the Grande Ronde River that crested above flood stage within a week.

March 10, 2014: 11.85 ft here, moderate flooding

  • PerryOR · Mar 10, 2014 · 7.41 ft · Minor

February 7, 2020: 11.73 ft here, moderate flooding

  • PerryOR · Feb 7, 2020 · 8.54 ft · Moderate · its highest

Gauges on the Grande Ronde River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Grande Ronde River
PerryOR6.68.54 ft, Feb 7, 20200
Troy this gaugeOR10.013.76 ft, Feb 9, 19962

Other gauges in Wallowa County

Flood gauges in Wallowa County
Imnaha5.511.44 ft, Jan 1, 19971

Wallowa County: every hazard · River floods across the country · Oregon

NOAA National Water Prediction Service, gauge TRYO3, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.