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Clark Fork River at St. Regis

Highest listed crest 20.27 ftFlood stage 19.0 ft19 crests since 1913

The Clark Fork River at St. Regis crested above flood stage 5 times among the 19 crests the National Weather Service lists from 1913 to 2025. The highest, 20.27 ft on May 18, 1997, was minor flooding, 1.27 feet above flood stage. 3 other gauges on the Clark Fork River crested above flood stage within a week of it.

The gauge

Highest listed crest
20.27 ft
May 18, 1997; 68,900 cubic feet per second
Flood stage
19.0 ft
Major flooding from 22.0 ft
Crests at major
0
5 above flood stage
Most recent flood crest
May 18, 1997
20.27 ft, minor flooding
Location
Mineral County
Montana

Flood stages

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

Flood categories, Clark Fork River at St. Regis
Action stage18.07May 12, 2018The level at which the NWS or its partners begin to take action
Flood stage (minor)19.05May 18, 1997Minimal or no property damage, but possibly some public threat
Moderate flood stage21.00—Some inundation of structures and roads near the stream
Major flood stage22.00—Extensive inundation of structures and roads

Every listed crest

19 crests from 1913 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Clark Fork River at St. Regis, 1913 to 2025 10121416182022ft Flood stage 19.0 ftMajor 22.0 ft May 30, 1913: 19.20 ft, minor flooding; 61,800 cubic feet per secondMay 29, 1917: 18.50 ft, action stage; 57,200 cubic feet per secondMay 10, 1947: 17.91 ft, below flood stage; 53,400 cubic feet per secondMay 24, 1948: 19.96 ft, minor flooding; 68,900 cubic feet per secondJun 19, 1950: 17.39 ft, below flood stage; 50,140 cubic feet per secondMay 24, 1956: 18.98 ft, action stage; 60,300 cubic feet per secondJun 10, 1964: 18.54 ft, action stage; 60,900 cubic feet per secondJun 3, 1972: 19.50 ft, minor flooding; 63,900 cubic feet per secondJun 18, 1974: 19.39 ft, minor flooding; 63,000 cubic feet per secondJun 21, 1975: 18.21 ft, action stage; 55,300 cubic feet per secondMay 16, 1976: 18.07 ft, action stage; 54,400 cubic feet per secondMay 18, 1997: 20.27 ft, minor flooding; 68,900 cubic feet per secondJun 10, 2011: 18.16 ft, action stage; 55,500 cubic feet per secondMay 12, 2018: 18.90 ft, action stage; 60,500 cubic feet per secondMay 19, 2019: 16.17 ft, below flood stage; 43,000 cubic feet per secondMay 22, 2020: 16.33 ft, below flood stage; 43,800 cubic feet per secondJun 6, 2021: 14.26 ft, below flood stage; 32,200 cubic feet per secondJun 13, 2022: 15.06 ft, below flood stage; 36,400 cubic feet per secondMay 12, 2025: 11.51 ft, below flood stage; 19,700 cubic feet per second Highest, 20.27 ft, May 18, 1997 192019401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Clark Fork River at St. Regis 1910s: 1 1920s: 0 1930s: 0 1940s: 1 1950s: 0 1960s: 0 1970s: 2 2 1980s: 0 1990s: 1 2000s: 0 2010s: 0 2020s: 0 1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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, Clark Fork River at St. Regis
1May 18, 199720.27+1.27Minor68,900
2May 24, 194819.96+0.96Minor68,900
3Jun 3, 197219.50+0.50Minor63,900
4Jun 18, 197419.39+0.39Minor63,000
5May 30, 191319.20+0.20Minor61,800
6May 24, 195618.98−0.02Action60,300
7May 12, 201818.90−0.10Action60,500
8Jun 10, 196418.54−0.46Action60,900
9May 29, 191718.50−0.50Action57,200
10Jun 21, 197518.21−0.79Action55,300
11Jun 10, 201118.16−0.84Action55,500
12May 16, 197618.07−0.93Action54,400
13May 10, 194717.91−1.09Below flood stage53,400
14Jun 19, 195017.39−1.61Below flood stage50,140
15May 22, 202016.33−2.67Below flood stage43,800
16May 19, 201916.17−2.83Below flood stage43,000
17Jun 13, 202215.06−3.94Below flood stage36,400
18Jun 6, 202114.26−4.74Below flood stage32,200
19May 12, 202511.51−7.49Below flood stage19,700

The worst floods along the Clark Fork River

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

May 18, 1997: 20.27 ft here, minor flooding

  • MissoulaMT · May 18, 1997 · 12.60 ft · Moderate
  • MissoulaMT · May 18, 1997 · 12.10 ft · Moderate
  • PlainsMT · May 19, 1997 · 17.12 ft · Minor

May 24, 1948: 19.96 ft here, minor flooding

  • MissoulaMT · May 23, 1948 · 13.07 ft · Major
  • MissoulaMT · May 23, 1948 · 12.08 ft · Moderate

June 3, 1972: 19.50 ft here, minor flooding

  • MissoulaMT · Jun 1, 1972 · 12.27 ft · Moderate
  • PlainsMT · Jun 10, 1972 · 17.13 ft · Minor
  • MissoulaMT · Jun 3, 1972 · 11.71 ft · Minor

Gauges on the Clark Fork River

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

Flood gauges on the Clark Fork River
DrummondMT8.010.03 ft, Feb 9, 19960
MissoulaMT7.517.40 ft, Jun 1, 19086
MissoulaMT11.012.14 ft, May 11, 20180
St. Regis this gaugeMT19.020.27 ft, May 18, 19970
PlainsMT16.019.17 ft, Jun 5, 19480

Other gauges in Mineral County

Flood gauges in Mineral County
St. Regis8.014.90 ft, Dec 20, 19330

Mineral County: every hazard · River floods across the country · Montana

NOAA National Water Prediction Service, gauge SRGM8, 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.