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Iowa River near Lone Tree (Tri-County Bridge)

Highest listed crest 23.10 ftFlood stage 16.0 ft75 crests since 1944

The Iowa River near Lone Tree (Tri-County Bridge) crested at major flood stage 3 times among the 75 crests the National Weather Service lists from 1944 to 2020. The highest, 23.10 ft on June 15, 2008, was major flooding, 7.10 feet above flood stage. 10 other gauges on the Iowa River crested above flood stage within a week of it, 8 at their own highest listed crest.

The gauge

Highest listed crest
23.10 ft
June 15, 2008; 53,700 cubic feet per second
Flood stage
16.0 ft
Major flooding from 22.0 ft
Crests at major
3
58th of 203 gauges in Iowa
Most recent flood crest
March 15, 2019
19.09 ft, moderate flooding
Location
Louisa County
Iowa

Flood stages

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

Flood categories, Iowa River near Lone Tree (Tri-County Bridge)
Action stage14.024Jun 10, 2020The level at which the NWS or its partners begin to take action
Flood stage (minor)16.022Sep 7, 2018Minimal or no property damage, but possibly some public threat
Moderate flood stage18.56Mar 15, 2019Some inundation of structures and roads near the stream
Major flood stage22.03Jul 3, 2014Extensive inundation of structures and roads

Every listed crest

75 crests from 1944 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Iowa River near Lone Tree (Tri-County Bridge), 1944 to 2020 510152025ft Flood stage 16.0 ftMajor 22.0 ft May 25, 1944: 19.94 ft, moderate floodingJun 25, 1957: 9.14 ft, below flood stage; 4,550 cubic feet per secondFeb 26, 1958: 11.47 ft, below flood stageMar 21, 1959: 15.97 ft, action stage; 16,600 cubic feet per secondApr 1, 1960: 17.90 ft, minor flooding; 28,100 cubic feet per secondMar 15, 1961: 16.06 ft, minor flooding; 17,000 cubic feet per secondMar 21, 1962: 17.68 ft, minor flooding; 26,600 cubic feet per secondMar 20, 1963: 13.18 ft, below flood stage; 10,700 cubic feet per secondJun 24, 1964: 9.69 ft, below flood stage; 5,770 cubic feet per secondSep 22, 1965: 20.27 ft, moderate flooding; 31,200 cubic feet per secondFeb 11, 1966: 15.52 ft, action stage; 16,200 cubic feet per secondJan 27, 1967: 13.45 ft, below flood stageJun 11, 1967: 10.38 ft, below flood stage; 6,760 cubic feet per secondNov 3, 1967: 10.00 ft, below flood stage; 6,300 cubic feet per secondJul 20, 1969: 16.92 ft, minor flooding; 21,700 cubic feet per secondMar 5, 1970: 16.52 ft, minor flooding; 19,900 cubic feet per secondFeb 21, 1971: 18.38 ft, minor floodingFeb 27, 1971: 15.26 ft, action stage; 15,400 cubic feet per secondAug 7, 1972: 14.79 ft, action stage; 14,000 cubic feet per secondJan 19, 1973: 17.08 ft, minor floodingApr 22, 1973: 16.62 ft, minor flooding; 20,300 cubic feet per secondMay 19, 1974: 18.97 ft, moderate flooding; 35,700 cubic feet per secondMar 21, 1975: 15.37 ft, action stage; 15,700 cubic feet per secondApr 26, 1976: 15.21 ft, action stage; 15,200 cubic feet per secondAug 16, 1977: 11.91 ft, below flood stage; 8,910 cubic feet per secondMar 20, 1978: 14.07 ft, action stageJul 23, 1978: 13.86 ft, below flood stage; 11,800 cubic feet per secondMar 20, 1979: 17.01 ft, minor flooding; 22,200 cubic feet per secondJun 15, 1980: 9.44 ft, below flood stage; 5,640 cubic feet per secondJun 30, 1981: 10.26 ft, below flood stage; 6,640 cubic feet per secondFeb 23, 1982: 16.87 ft, minor floodingJun 16, 1982: 16.34 ft, minor flooding; 18,400 cubic feet per secondApr 3, 1983: 15.92 ft, action stage; 17,500 cubic feet per secondFeb 20, 1984: 16.61 ft, minor flooding; 13,700 cubic feet per secondFeb 23, 1985: 16.16 ft, minor floodingMar 5, 1985: 15.02 ft, action stage; 14,800 cubic feet per secondMay 18, 1986: 16.96 ft, minor flooding; 20,800 cubic feet per secondOct 27, 1986: 13.07 ft, below flood stage; 10,600 cubic feet per secondJan 21, 1988: 14.30 ft, action stage; 6,670 cubic feet per secondSep 10, 1989: 11.89 ft, below flood stage; 8,930 cubic feet per secondJun 20, 1990: 18.08 ft, minor flooding; 26,500 cubic feet per secondJun 3, 1991: 15.19 ft, action stage; 15,400 cubic feet per secondJul 31, 1992: 14.42 ft, action stage; 13,200 cubic feet per secondJul 7, 1993: 22.94 ft, major flooding; 57,100 cubic feet per secondOct 1, 1993: 14.44 ft, action stageMar 6, 1994: 13.07 ft, below flood stage; 10,600 cubic feet per secondApr 28, 1995: 14.29 ft, action stage; 12,900 cubic feet per secondMay 11, 1996: 18.44 ft, minor flooding; 28,300 cubic feet per secondFeb 21, 1997: 17.32 ft, minor flooding; 21,000 cubic feet per secondApr 1, 1998: 14.15 ft, action stage; 13,800 cubic feet per secondOct 18, 1998: 14.40 ft, action stage; 14,500 cubic feet per secondJun 14, 2000: 12.84 ft, below flood stage; 11,200 cubic feet per secondFeb 10, 2001: 15.27 ft, action stageMar 17, 2001: 15.09 ft, action stage; 16,100 cubic feet per secondMay 12, 2002: 10.94 ft, below flood stage; 8,070 cubic feet per secondMay 10, 2003: 12.29 ft, below flood stage; 9,120 cubic feet per secondMar 6, 2004: 14.51 ft, action stage; 13,100 cubic feet per secondMay 14, 2005: 11.80 ft, below flood stage; 8,510 cubic feet per secondApr 7, 2006: 10.25 ft, below flood stage; 6,280 cubic feet per secondApr 28, 2007: 15.28 ft, action stage; 15,100 cubic feet per secondJun 15, 2008: 23.10 ft, major flooding; 53,700 cubic feet per secondMar 10, 2009: 17.80 ft, minor flooding; 22,300 cubic feet per secondAug 5, 2010: 17.68 ft, minor flooding; 21,800 cubic feet per secondFeb 18, 2011: 17.05 ft, minor floodingJun 15, 2011: 15.59 ft, action stage; 16,100 cubic feet per secondMay 4, 2012: 11.81 ft, below flood stage; 9,190 cubic feet per secondApr 19, 2013: 21.99 ft, moderate flooding; 45,600 cubic feet per secondJul 3, 2014: 22.13 ft, major flooding; 46,600 cubic feet per secondAug 12, 2015: 14.71 ft, action stage; 14,300 cubic feet per secondDec 16, 2015: 16.38 ft, minor flooding; 18,000 cubic feet per secondJan 17, 2017: 15.78 ft, action stageSep 7, 2018: 16.12 ft, minor flooding; 18,000 cubic feet per secondOct 9, 2018: 20.39 ft, moderate flooding; 35,400 cubic feet per secondMar 15, 2019: 19.09 ft, moderate flooding; 28,600 cubic feet per secondJun 10, 2020: 15.56 ft, action stage; 17,000 cubic feet per second Highest, 23.10 ft, Jun 15, 2008 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Iowa River near Lone Tree (Tri-County Bridge) 1940s: 1 1950s: 0 1960s: 5 1970s: 6 1980s: 5 1990s: 4 2000s: 2 2010s: 8 8 2020s: 0 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

The 50 highest of 75 listed crests.

Highest listed crests, Iowa River near Lone Tree (Tri-County Bridge)
1Jun 15, 200823.10+7.10Major53,700
2Jul 7, 199322.94+6.94Major57,100
3Jul 3, 201422.13+6.13Major46,600
4Apr 19, 201321.99+5.99Moderate45,600
5Oct 9, 201820.39+4.39Moderate35,400
6Sep 22, 196520.27+4.27Moderate31,200
7May 25, 194419.94+3.94Moderate—
8Mar 15, 201919.09+3.09Moderate28,600
9May 19, 197418.97+2.97Moderate35,700
10May 11, 199618.44+2.44Minor28,300
11Feb 21, 197118.38+2.38Minor—
12Jun 20, 199018.08+2.08Minor26,500
13Apr 1, 196017.90+1.90Minor28,100
14Mar 10, 200917.80+1.80Minor22,300
15Mar 21, 196217.68+1.68Minor26,600
16Aug 5, 201017.68+1.68Minor21,800
17Feb 21, 199717.32+1.32Minor21,000
18Jan 19, 197317.08+1.08Minor—
19Feb 18, 201117.05+1.05Minor—
20Mar 20, 197917.01+1.01Minor22,200
21May 18, 198616.96+0.96Minor20,800
22Jul 20, 196916.92+0.92Minor21,700
23Feb 23, 198216.87+0.87Minor—
24Apr 22, 197316.62+0.62Minor20,300
25Feb 20, 198416.61+0.61Minor13,700
26Mar 5, 197016.52+0.52Minor19,900
27Dec 16, 201516.38+0.38Minor18,000
28Jun 16, 198216.34+0.34Minor18,400
29Feb 23, 198516.16+0.16Minor—
30Sep 7, 201816.12+0.12Minor18,000
31Mar 15, 196116.06+0.06Minor17,000
32Mar 21, 195915.97−0.03Action16,600
33Apr 3, 198315.92−0.08Action17,500
34Jan 17, 201715.78−0.22Action—
35Jun 15, 201115.59−0.41Action16,100
36Jun 10, 202015.56−0.44Action17,000
37Feb 11, 196615.52−0.48Action16,200
38Mar 21, 197515.37−0.63Action15,700
39Apr 28, 200715.28−0.72Action15,100
40Feb 10, 200115.27−0.73Action—
41Feb 27, 197115.26−0.74Action15,400
42Apr 26, 197615.21−0.79Action15,200
43Jun 3, 199115.19−0.81Action15,400
44Mar 17, 200115.09−0.91Action16,100
45Mar 5, 198515.02−0.98Action14,800
46Aug 7, 197214.79−1.21Action14,000
47Aug 12, 201514.71−1.29Action14,300
48Mar 6, 200414.51−1.49Action13,100
49Oct 1, 199314.44−1.56Action—
50Jul 31, 199214.42−1.58Action13,200

The worst floods along the Iowa River

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

June 15, 2008: 23.10 ft here, major flooding

  • Columbus JctIA · Jun 15, 2008 · 32.30 ft · Major · its highest
  • WapelloIA · Jun 14, 2008 · 32.15 ft · Major · its highest
  • Iowa CityIA · Jun 15, 2008 · 31.53 ft · Major · its highest
  • OakvilleIA · Jun 14, 2008 · 23.22 ft · Major · its highest
  • MarengoIA · Jun 12, 2008 · 21.38 ft · Major · its highest
  • RowanIA · Jun 9, 2008 · 15.89 ft · Moderate · its highest
  • MarshalltownIA · Jun 13, 2008 · 21.79 ft · Minor
  • Tama US 63IA · Jun 13, 2008 · 21.31 ft · Minor
  • Belle PlaineIA · Jun 13, 2008 · 19.86 ft · Minor · its highest
  • Steamboat RockIA · Jun 8, 2008 · 17.86 ft · Minor · its highest

July 7, 1993: 22.94 ft here, major flooding

  • WapelloIA · Jul 7, 1993 · 29.53 ft · Major
  • Columbus JctIA · Jul 7, 1993 · 28.30 ft · Major
  • MarengoIA · Jul 12, 1993 · 20.26 ft · Major
  • Belle PlaineIA · Jul 11, 1993 · 18.74 ft · Minor

July 3, 2014: 22.13 ft here, major flooding

  • WapelloIA · Jul 3, 2014 · 30.18 ft · Major
  • Columbus JctIA · Jul 3, 2014 · 27.67 ft · Major
  • MarengoIA · Jul 2, 2014 · 19.96 ft · Major
  • Tama Hwy E49IA · Jul 3, 2014 · 15.08 ft · Major
  • OakvilleIA · Jul 4, 2014 · 19.22 ft · Moderate
  • MarshalltownIA · Jul 2, 2014 · 22.25 ft · Minor · its highest
  • Tama US 63IA · Jul 2, 2014 · 22.00 ft · Minor
  • Belle PlaineIA · Jul 3, 2014 · 19.11 ft · Minor

Gauges on the Iowa River

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Iowa River
Belle PlaineIA15.019.86 ft, Jun 13, 20080
Columbus JctIA23.032.30 ft, Jun 15, 20083
Iowa CityIA23.531.53 ft, Jun 15, 20082
MarengoIA15.021.38 ft, Jun 12, 200810
MarshalltownIA19.022.25 ft, Jul 2, 20140
OakvilleIA11.023.22 ft, Jun 14, 20081
Steamboat RockIA11.017.86 ft, Jun 8, 20080
WapelloIA21.032.15 ft, Jun 14, 20087
Lone Tree (Tri-County Bridge) this gaugeIA16.023.10 ft, Jun 15, 20083
RowanIA12.515.89 ft, Jun 9, 20080
Tama Hwy E49IA12.515.20 ft, May 28, 20133
Tama US 63IA20.022.31 ft, Apr 28, 20070

Other gauges in Louisa County

Flood gauges in Louisa County
Columbus Jct23.032.30 ft, Jun 15, 20083
Oakville11.023.22 ft, Jun 14, 20081
Wapello21.032.15 ft, Jun 14, 20087
Keithsburg14.024.49 ft, Jun 17, 200822

Louisa County: every hazard · River floods across the country · Iowa

NOAA National Water Prediction Service, gauge LNTI4, 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.