Search
Menu

Explore

Hazards

Analysis

Rankings

Reference

Tualatin River at Farmington

Highest listed crest 37.20 ftFlood stage 32.0 ft28 crests since 1933

The Tualatin River at Farmington crested at major flood stage 3 times among the 28 crests the National Weather Service lists from 1933 to 2015. The highest, 37.20 ft on February 9, 1996, was major flooding, 5.20 feet above flood stage. 2 other gauges on the Tualatin River crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest
37.20 ft
February 9, 1996
Flood stage
32.0 ft
Major flooding from 36.0 ft
Crests at major
3
30th of 100 gauges in Oregon
Most recent flood crest
December 19, 2015
32.80 ft, minor flooding
Location
Washington County
Near Hillsboro (5.4 mi), Beaverton (6.8 mi), Cornelius (6.8 mi)

Flood stages

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

Flood categories, Tualatin River at Farmington
Action stage28.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)32.017Dec 19, 2015Minimal or no property damage, but possibly some public threat
Moderate flood stage34.08Dec 11, 2015Some inundation of structures and roads near the stream
Major flood stage36.03Feb 9, 1996Extensive inundation of structures and roads

Every listed crest

28 crests from 1933 to 2015. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Tualatin River at Farmington, 1933 to 2015 32343638ft Flood stage 32.0 ftMajor 36.0 ft Dec 22, 1933: 37.00 ft, major floodingDec 21, 1941: 33.50 ft, minor floodingApr 2, 1942: 32.89 ft, minor floodingApr 2, 1943: 33.04 ft, minor floodingFeb 18, 1949: 34.50 ft, moderate floodingFeb 26, 1950: 33.50 ft, minor floodingJan 23, 1951: 33.00 ft, minor floodingDec 6, 1951: 33.40 ft, minor floodingJan 21, 1953: 33.30 ft, minor floodingFeb 15, 1954: 33.30 ft, minor floodingDec 22, 1955: 36.03 ft, major floodingJan 5, 1956: 34.40 ft, moderate floodingJan 12, 1959: 33.10 ft, minor floodingJan 21, 1964: 33.20 ft, minor floodingJan 27, 1964: 34.40 ft, moderate floodingDec 24, 1964: 34.40 ft, moderate floodingJan 30, 1965: 32.60 ft, minor floodingJan 24, 1970: 33.30 ft, minor floodingJan 17, 1974: 35.13 ft, moderate floodingDec 17, 1977: 34.00 ft, moderate floodingDec 15, 1995: 33.20 ft, minor floodingFeb 9, 1996: 37.20 ft, major floodingJan 1, 1997: 34.81 ft, moderate floodingJan 1, 2006: 32.86 ft, minor flooding; 11,396 cubic feet per secondJan 12, 2006: 33.63 ft, minor flooding; 13,421 cubic feet per secondDec 6, 2007: 32.60 ft, minor flooding; 11,100 cubic feet per secondDec 11, 2015: 34.02 ft, moderate flooding; 15,000 cubic feet per secondDec 19, 2015: 32.80 ft, minor flooding; 11,500 cubic feet per second Highest, 37.20 ft, Feb 9, 1996 1940196019802000

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Tualatin River at Farmington 1930s: 1 1940s: 4 1950s: 8 8 1960s: 4 1970s: 3 1980s: 0 1990s: 3 2000s: 3 2010s: 2 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, Tualatin River at Farmington
1Feb 9, 199637.20+5.20Major—
2Dec 22, 193337.00+5.00Major—
3Dec 22, 195536.03+4.03Major—
4Jan 17, 197435.13+3.13Moderate—
5Jan 1, 199734.81+2.81Moderate—
6Feb 18, 194934.50+2.50Moderate—
7Jan 5, 195634.40+2.40Moderate—
8Jan 27, 196434.40+2.40Moderate—
9Dec 24, 196434.40+2.40Moderate—
10Dec 11, 201534.02+2.02Moderate15,000
11Dec 17, 197734.00+2.00Moderate—
12Jan 12, 200633.63+1.63Minor13,421
13Dec 21, 194133.50+1.50Minor—
14Feb 26, 195033.50+1.50Minor—
15Dec 6, 195133.40+1.40Minor—
16Jan 21, 195333.30+1.30Minor—
17Feb 15, 195433.30+1.30Minor—
18Jan 24, 197033.30+1.30Minor—
19Jan 21, 196433.20+1.20Minor—
20Dec 15, 199533.20+1.20Minor—
21Jan 12, 195933.10+1.10Minor—
22Apr 2, 194333.04+1.04Minor—
23Jan 23, 195133.00+1.00Minor—
24Apr 2, 194232.89+0.89Minor—
25Jan 1, 200632.86+0.86Minor11,396
26Dec 19, 201532.80+0.80Minor11,500
27Jan 30, 196532.60+0.60Minor—
28Dec 6, 200732.60+0.60Minor11,100

The worst floods along the Tualatin River

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

February 9, 1996: 37.20 ft here, major flooding

  • West LinnOR · Feb 10, 1996 · 18.32 ft · Major · its highest
  • DilleyOR · Feb 8, 1996 · 19.06 ft · Moderate

December 22, 1955: 36.03 ft here, major flooding

  • West LinnOR · Dec 23, 1955 · 16.27 ft · Major
  • DilleyOR · Dec 22, 1955 · 18.80 ft · Moderate

January 17, 1974: 35.13 ft here, moderate flooding

  • West LinnOR · Jan 18, 1974 · 16.31 ft · Major
  • DilleyOR · Jan 16, 1974 · 18.53 ft · Moderate

Gauges on the Tualatin River

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

Flood gauges on the Tualatin River
DilleyOR17.519.27 ft, Jan 21, 19720
Farmington this gaugeOR32.037.20 ft, Feb 9, 19963
West LinnOR13.518.32 ft, Feb 10, 19965

Other gauges in Washington County

Flood gauges in Washington County
Durham9.111.78 ft, Dec 7, 20150
Forest Grove16.517.05 ft, Dec 19, 20250
Dilley17.519.27 ft, Jan 21, 19720

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

NOAA National Water Prediction Service, gauge FRMO3, 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.