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Imnaha River at Imnaha

Highest listed crest 11.44 ftFlood stage 5.5 ft19 crests since 1938

The Imnaha River at Imnaha crested at major flood stage 1 time among the 19 crests the National Weather Service lists from 1938 to 2019. The highest, 11.44 ft on January 1, 1997, was major flooding, 5.94 feet above flood stage.

The gauge

Highest listed crest
11.44 ft
January 1, 1997; 20,200 cubic feet per second
Flood stage
5.5 ft
Major flooding from 9.0 ft
Crests at major
1
45th of 100 gauges in Oregon
Most recent flood crest
April 9, 2019
5.63 ft, minor flooding
Location
Wallowa County
Oregon
Identifiers
NWS IMNO3
No USGS station

Flood stages

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

Flood categories, Imnaha River at Imnaha
Action stage5.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)5.514Apr 9, 2019Minimal or no property damage, but possibly some public threat
Moderate flood stage7.04May 26, 1998Some inundation of structures and roads near the stream
Major flood stage9.01Jan 1, 1997Extensive inundation of structures and roads

Every listed crest

19 crests from 1938 to 2019. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Imnaha River at Imnaha, 1938 to 2019 4681012ft Flood stage 5.5 ftMajor 9.0 ft May 1, 1938: 6.27 ft, minor flooding; 4,800 cubic feet per secondMay 23, 1942: 6.70 ft, minor flooding; 5,400 cubic feet per secondMay 28, 1948: 7.06 ft, moderate flooding; 5,700 cubic feet per secondMay 27, 1956: 6.05 ft, minor flooding; 4,650 cubic feet per secondMay 19, 1957: 6.80 ft, minor flooding; 6,650 cubic feet per secondMay 23, 1967: 6.08 ft, minor flooding; 4,720 cubic feet per secondMay 4, 1971: 6.25 ft, minor flooding; 5,350 cubic feet per secondJan 17, 1974: 7.86 ft, moderate flooding; 10,100 cubic feet per secondMay 15, 1975: 6.37 ft, minor flooding; 5,630 cubic feet per secondApr 27, 1978: 7.61 ft, moderate flooding; 6,830 cubic feet per secondMay 7, 1995: 6.29 ft, minor flooding; 4,410 cubic feet per secondDec 12, 1995: 5.95 ft, minor flooding; 3,840 cubic feet per secondJan 1, 1997: 11.44 ft, major flooding; 20,200 cubic feet per secondApr 20, 1997: 5.92 ft, minor flooding; 4,290 cubic feet per secondMay 26, 1998: 7.06 ft, moderate flooding; 6,350 cubic feet per secondJun 5, 2010: 6.07 ft, minor flooding; 5,482 cubic feet per secondMay 16, 2011: 6.80 ft, minor floodingApr 27, 2012: 5.94 ft, minor flooding; 4,236 cubic feet per secondApr 9, 2019: 5.63 ft, minor flooding; 3,285 cubic feet per second Highest, 11.44 ft, Jan 1, 1997 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Imnaha River at Imnaha 1930s: 1 1940s: 2 1950s: 2 1960s: 1 1970s: 4 1980s: 0 1990s: 5 5 2000s: 0 2010s: 4 1930s1940s1950s1960s1970s1980s1990s2000s2010s
  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, Imnaha River at Imnaha
1Jan 1, 199711.44+5.94Major20,200
2Jan 17, 19747.86+2.36Moderate10,100
3Apr 27, 19787.61+2.11Moderate6,830
4May 28, 19487.06+1.56Moderate5,700
5May 26, 19987.06+1.56Moderate6,350
6May 19, 19576.80+1.30Minor6,650
7May 16, 20116.80+1.30Minor—
8May 23, 19426.70+1.20Minor5,400
9May 15, 19756.37+0.87Minor5,630
10May 7, 19956.29+0.79Minor4,410
11May 1, 19386.27+0.77Minor4,800
12May 4, 19716.25+0.75Minor5,350
13May 23, 19676.08+0.58Minor4,720
14Jun 5, 20106.07+0.57Minor5,482
15May 27, 19566.05+0.55Minor4,650
16Dec 12, 19955.95+0.45Minor3,840
17Apr 27, 20125.94+0.44Minor4,236
18Apr 20, 19975.92+0.42Minor4,290
19Apr 9, 20195.63+0.13Minor3,285

Other gauges in Wallowa County

Flood gauges in Wallowa County
Troy10.013.76 ft, Feb 9, 19962

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

NOAA National Water Prediction Service, gauge IMNO3, 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.