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Little Sioux River at Linn Grove

Highest listed crest 29.98 ftFlood stage 16.5 ft27 crests since 1962

The Little Sioux River at Linn Grove crested at major flood stage 6 times among the 27 crests the National Weather Service lists from 1962 to 2025. The highest, 29.98 ft on June 23, 2024, was major flooding, 13.48 feet above flood stage. 7 other gauges on the Little Sioux River crested above flood stage within a week of it, 6 at their own highest listed crest.

The gauge

Highest listed crest
29.98 ft
June 23, 2024; 54,500 cubic feet per second
Flood stage
16.5 ft
Major flooding from 22.5 ft
Crests at major
6
41st of 203 gauges in Iowa
Most recent flood crest
June 23, 2024
29.98 ft, major flooding
Location
Buena Vista County
Iowa

Flood stages

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

Flood categories, Little Sioux River at Linn Grove
Action stage14.01May 29, 2020The level at which the NWS or its partners begin to take action
Flood stage (minor)16.513May 25, 2017Minimal or no property damage, but possibly some public threat
Moderate flood stage20.03May 2, 2016Some inundation of structures and roads near the stream
Major flood stage22.56Jun 23, 2024Extensive inundation of structures and roads

Every listed crest

27 crests from 1962 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Little Sioux River at Linn Grove, 1962 to 2025 -100102030ft Flood stage 16.5 ftMajor 22.5 ft Mar 1, 1962: -0.99 ft, below flood stage; 10,500 cubic feet per secondJun 26, 1994: 17.50 ft, minor flooding; 8,960 cubic feet per secondJun 16, 2000: 16.88 ft, minor flooding; 1,320 cubic feet per secondJun 18, 2001: 19.88 ft, minor flooding; 6,690 cubic feet per secondJun 14, 2002: 17.33 ft, minor flooding; 1,850 cubic feet per secondJun 28, 2003: 18.30 ft, minor flooding; 3,290 cubic feet per secondSep 19, 2004: 20.94 ft, moderate flooding; 9,570 cubic feet per secondMay 17, 2005: 19.27 ft, minor flooding; 5,220 cubic feet per secondApr 5, 2006: 19.72 ft, minor flooding; 6,280 cubic feet per secondMar 16, 2007: 21.30 ft, moderate floodingJun 15, 2008: 19.09 ft, minor flooding; 4,830 cubic feet per secondJul 15, 2009: 17.72 ft, minor flooding; 2,370 cubic feet per secondMar 17, 2010: 22.85 ft, major flooding; 13,300 cubic feet per secondJul 17, 2011: 22.57 ft, major flooding; 12,600 cubic feet per secondJun 2, 2012: 18.35 ft, minor flooding; 3,490 cubic feet per secondMay 30, 2013: 19.03 ft, minor flooding; 4,810 cubic feet per secondJun 18, 2014: 22.91 ft, major flooding; 13,500 cubic feet per secondAug 20, 2015: 17.01 ft, minor flooding; 1,440 cubic feet per secondMay 2, 2016: 20.18 ft, moderate flooding; 7,590 cubic feet per secondMay 25, 2017: 18.92 ft, minor flooding; 4,690 cubic feet per secondSep 22, 2018: 23.91 ft, major flooding; 20,100 cubic feet per secondMar 16, 2019: 24.13 ft, major flooding; 26,400 cubic feet per secondMay 29, 2020: 15.72 ft, action stage; 4,180 cubic feet per secondMar 9, 2021: 7.76 ft, below flood stage; 612 cubic feet per secondMay 18, 2023: 13.90 ft, below flood stage; 3,140 cubic feet per secondJun 23, 2024: 29.98 ft, major flooding; 54,500 cubic feet per secondAug 2, 2025: 12.87 ft, below flood stage; 3,560 cubic feet per second Highest, 29.98 ft, Jun 23, 2024 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Little Sioux River at Linn Grove 1960s: 0 1970s: 0 1980s: 0 1990s: 1 2000s: 10 10 2010s: 10 2020s: 1 1960s1970s1980s1990s2000s2010s2020s
  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.
  3. 27 crests measured on an earlier gauge datum are left out: 22.25 ft on Apr 7, 1965; 14.52 ft on Mar 7, 1973; 10.77 ft on Nov 23, 1973; 17.85 ft on Apr 29, 1975; 10.86 ft on Mar 15, 1976; 7.76 ft on Mar 14, 1977; and more.

Highest crests

Highest listed crests, Little Sioux River at Linn Grove
1Jun 23, 202429.98+13.48Major54,500
2Mar 16, 201924.13+7.63Major26,400
3Sep 22, 201823.91+7.41Major20,100
4Jun 18, 201422.91+6.41Major13,500
5Mar 17, 201022.85+6.35Major13,300
6Jul 17, 201122.57+6.07Major12,600
7Mar 16, 200721.30+4.80Moderate—
8Sep 19, 200420.94+4.44Moderate9,570
9May 2, 201620.18+3.68Moderate7,590
10Jun 18, 200119.88+3.38Minor6,690
11Apr 5, 200619.72+3.22Minor6,280
12May 17, 200519.27+2.77Minor5,220
13Jun 15, 200819.09+2.59Minor4,830
14May 30, 201319.03+2.53Minor4,810
15May 25, 201718.92+2.42Minor4,690
16Jun 2, 201218.35+1.85Minor3,490
17Jun 28, 200318.30+1.80Minor3,290
18Jul 15, 200917.72+1.22Minor2,370
19Jun 26, 199417.50+1.00Minor8,960
20Jun 14, 200217.33+0.83Minor1,850
21Aug 20, 201517.01+0.51Minor1,440
22Jun 16, 200016.88+0.38Minor1,320
23May 29, 202015.72−0.78Action4,180
24May 18, 202313.90−2.60Below flood stage3,140
25Aug 2, 202512.87−3.63Below flood stage3,560
26Mar 9, 20217.76−8.74Below flood stage612
27Mar 1, 1962-0.99−17.49Below flood stage10,500

The worst floods along the Little Sioux River

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

June 23, 2024: 29.98 ft here, major flooding

  • MontgomeryIA · Jun 23, 2024 · 1,395.88 ft · Major · its highest
  • Spencer / Highway 18IA · Jun 22, 2024 · 1,328.17 ft · Major · its highest
  • CherokeeIA · Jun 24, 2024 · 32.98 ft · Major · its highest
  • CorrectionvilleIA · Jun 24, 2024 · 30.92 ft · Major · its highest
  • SpencerIA · Jun 22, 2024 · 22.20 ft · Major · its highest
  • MilfordIA · Jun 22, 2024 · 20.40 ft · Major · its highest
  • TurinIA · Jun 26, 2024 · 27.37 ft · Minor

March 16, 2019: 24.13 ft here, major flooding

  • CherokeeIA · Mar 14, 2019 · 28.40 ft · Major
  • CorrectionvilleIA · Mar 15, 2019 · 26.45 ft · Major
  • SpencerIA · Mar 15, 2019 · 17.45 ft · Major
  • MontgomeryIA · Mar 16, 2019 · 1,394.32 ft · Moderate
  • Spencer / Highway 18IA · Mar 18, 2019 · 1,325.50 ft · Moderate
  • TurinIA · Mar 15, 2019 · 29.57 ft · Moderate · its highest
  • MilfordIA · Mar 18, 2019 · 18.02 ft · Moderate

September 22, 2018: 23.91 ft here, major flooding

Gauges on the Little Sioux River

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

Flood gauges on the Little Sioux River
SpencerIA10.014.45 ft, Jul 15, 20110
CherokeeIA17.032.98 ft, Jun 24, 20249
CorrectionvilleIA19.030.92 ft, Jun 24, 202412
Linn Grove this gaugeIA16.529.98 ft, Jun 23, 20246
SpencerIA10.022.20 ft, Jun 22, 202412
MilfordIA13.020.40 ft, Jun 22, 20242
MontgomeryIA1,391.01,395.88 ft, Jun 23, 20242
Spencer / Highway 18IA1,322.01,328.17 ft, Jun 22, 20241
TurinIA25.029.57 ft, Mar 15, 20190

Buena Vista County: every hazard · River floods across the country · Iowa

NOAA National Water Prediction Service, gauge LNNI4, 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.