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Smith River (MT) at Truly

Highest listed crest 22.50 ftFlood stage 9.0 ft19 crests since 1907

The Smith River (MT) at Truly crested at major flood stage 1 time among the 19 crests the National Weather Service lists from 1907 to 2015. The highest, 22.50 ft on June 4, 1953, was major flooding, 13.50 feet above flood stage.

The gauge

Highest listed crest
22.50 ft
June 4, 1953; 30,300 cubic feet per second
Flood stage
9.0 ft
Major flooding from 15.0 ft
Crests at major
1
28th of 93 gauges in Montana
Most recent flood crest
June 10, 2011
10.25 ft, minor flooding
Location
Cascade County
Near Great Falls (11.2 mi)
Identifiers
NWS ULLM8
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, Smith River (MT) at Truly
Action stage8.01May 26, 2011The level at which the NWS or its partners begin to take action
Flood stage (minor)9.03Jun 10, 2011Minimal or no property damage, but possibly some public threat
Moderate flood stage12.00—Some inundation of structures and roads near the stream
Major flood stage15.01Jun 4, 1953Extensive inundation of structures and roads

Every listed crest

19 crests from 1907 to 2015. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Smith River (MT) at Truly, 1907 to 2015 0510152025ft Flood stage 9.0 ftMajor 15.0 ft Jun 24, 1907: 9.00 ft, minor flooding; 8,800 cubic feet per secondJun 4, 1953: 22.50 ft, major flooding; 30,300 cubic feet per secondJun 15, 1967: 9.80 ft, minor flooding; 9,500 cubic feet per secondMay 30, 2003: 4.77 ft, below flood stageMay 3, 2004: 7.40 ft, below flood stageJun 4, 2005: 7.55 ft, below flood stageJun 11, 2006: 7.30 ft, below flood stageMay 26, 2008: 7.96 ft, below flood stageMay 21, 2009: 5.22 ft, below flood stageApr 24, 2010: 5.18 ft, below flood stageMay 20, 2010: 7.17 ft, below flood stageJun 5, 2010: 7.19 ft, below flood stageJun 22, 2010: 7.08 ft, below flood stageMay 26, 2011: 8.78 ft, action stageJun 10, 2011: 10.25 ft, minor floodingJun 7, 2012: 5.74 ft, below flood stageJun 4, 2013: 6.85 ft, below flood stageMay 26, 2014: 6.14 ft, below flood stageJun 3, 2015: 5.53 ft, below flood stage Highest, 22.50 ft, Jun 4, 1953 19201940196019802000

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Smith River (MT) at Truly 1900s: 1 1 1910s: 0 1920s: 0 1930s: 0 1940s: 0 1950s: 1 1960s: 1 1970s: 0 1980s: 0 1990s: 0 2000s: 0 2010s: 1 1900s1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s
  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, Smith River (MT) at Truly
1Jun 4, 195322.50+13.50Major30,300
2Jun 10, 201110.25+1.25Minor—
3Jun 15, 19679.80+0.80Minor9,500
4Jun 24, 19079.000.00Minor8,800
5May 26, 20118.78−0.22Action—
6May 26, 20087.96−1.04Below flood stage—
7Jun 4, 20057.55−1.45Below flood stage—
8May 3, 20047.40−1.60Below flood stage—
9Jun 11, 20067.30−1.70Below flood stage—
10Jun 5, 20107.19−1.81Below flood stage—
11May 20, 20107.17−1.83Below flood stage—
12Jun 22, 20107.08−1.92Below flood stage—
13Jun 4, 20136.85−2.15Below flood stage—
14May 26, 20146.14−2.86Below flood stage—
15Jun 7, 20125.74−3.26Below flood stage—
16Jun 3, 20155.53−3.47Below flood stage—
17May 21, 20095.22−3.78Below flood stage—
18Apr 24, 20105.18−3.82Below flood stage—
19May 30, 20034.77−4.23Below flood stage—

Other gauges in Cascade County

Flood gauges in Cascade County
Monarch6.57.74 ft, Jun 9, 19640
Ulm13.517.00 ft, Jun 1, 19531
Simms7.513.70 ft, Jun 9, 19643
Vaughn6.013.66 ft, Mar 19, 196920

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

NOAA National Water Prediction Service, gauge ULLM8, 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.