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Deep River (IN) near Merrillville

Highest listed crest 11.80 ftFlood stage 8.5 ft12 crests since 2018

The Deep River (IN) near Merrillville crested above flood stage 12 times among the 12 crests the National Weather Service lists from 2018 to 2021. The highest, 11.80 ft on February 21, 2018, was moderate flooding, 3.30 feet above flood stage. 2 other gauges on the Deep River (IN) crested above flood stage within a week of it.

The gauge

Highest listed crest
11.80 ft
February 21, 2018
Flood stage
8.5 ft
Major flooding from 13.5 ft
Crests at major
0
12 above flood stage
Most recent flood crest
May 9, 2021
9.89 ft, minor flooding
Location
Lake County
Near Merrillville (3.4 mi), Hobart (4.3 mi), Crown Point (5.5 mi)

Flood stages

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

Flood categories, Deep River (IN) near Merrillville
Action stage7.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)8.54May 9, 2021Minimal or no property damage, but possibly some public threat
Moderate flood stage10.58May 24, 2020Some inundation of structures and roads near the stream
Major flood stage13.50—Extensive inundation of structures and roads

Every listed crest

12 crests from 2018 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Deep River (IN) near Merrillville, 2018 to 2021 8101214ft Flood stage 8.5 ftMajor 13.5 ft Feb 21, 2018: 11.80 ft, moderate floodingNov 26, 2018: 8.84 ft, minor floodingJan 1, 2019: 9.02 ft, minor floodingMay 1, 2019: 11.36 ft, moderate floodingJun 20, 2019: 10.73 ft, moderate floodingSep 28, 2019: 11.21 ft, moderate floodingOct 31, 2019: 9.44 ft, minor floodingJan 11, 2020: 11.08 ft, moderate floodingApr 30, 2020: 10.73 ft, moderate floodingMay 15, 2020: 11.07 ft, moderate floodingMay 24, 2020: 11.09 ft, moderate floodingMay 9, 2021: 9.89 ft, minor flooding Highest, 11.80 ft, Feb 21, 2018 20202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Deep River (IN) near Merrillville 2010s: 7 7 2020s: 5 2010s2020s
  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, Deep River (IN) near Merrillville
1Feb 21, 201811.80+3.30Moderate—
2May 1, 201911.36+2.86Moderate—
3Sep 28, 201911.21+2.71Moderate—
4May 24, 202011.09+2.59Moderate—
5Jan 11, 202011.08+2.58Moderate—
6May 15, 202011.07+2.57Moderate—
7Jun 20, 201910.73+2.23Moderate—
8Apr 30, 202010.73+2.23Moderate—
9May 9, 20219.89+1.39Minor—
10Oct 31, 20199.44+0.94Minor—
11Jan 1, 20199.02+0.52Minor—
12Nov 26, 20188.84+0.34Minor—

The worst floods along the Deep River (IN)

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

February 21, 2018: 11.80 ft here, moderate flooding

  • LiverpoolIN · Feb 22, 2018 · 19.81 ft · Moderate
  • HobartIN · Feb 21, 2018 · 15.00 ft · Minor

May 1, 2019: 11.36 ft here, moderate flooding

  • LiverpoolIN · May 2, 2019 · 18.27 ft · Minor
  • HobartIN · May 1, 2019 · 15.37 ft · Minor

Gauges on the Deep River (IN)

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

Flood gauges on the Deep River (IN)
Merrillville this gaugeIN8.511.80 ft, Feb 21, 20180
HobartIN13.022.18 ft, Sep 15, 20081
LiverpoolIN17.523.00 ft, Sep 14, 20081

Other gauges in Lake County

Flood gauges in Lake County
Hobart13.022.18 ft, Sep 15, 20081
Liverpool17.523.00 ft, Sep 14, 20081
Dyer12.016.76 ft, Sep 14, 20084
Munster6.010.93 ft, Feb 20, 20189
East Chicago (Lake Michigan outlet)13.014.35 ft, Apr 30, 20200
Shelby10.513.04 ft, Sep 18, 20084
Gary (Burr Street)11.014.50 ft, Sep 14, 20080
Gary (Grant St)11.016.00 ft, Sep 14, 20080
Hammond (Indianapolis Boulevard)14.015.50 ft, Sep 14, 20080
Highland (Kennedy Avenue)15.017.50 ft, Sep 14, 20080
Munster12.017.29 ft, Sep 14, 20082
Munster (Northcote Avenue)18.020.00 ft, Sep 14, 20080
Lake Station13.017.50 ft, Sep 14, 20081
Merrillville11.017.50 ft, Sep 14, 20081
Schererville7.511.00 ft, Sep 14, 20081

Lake County: every hazard · River floods across the country · Indiana

NOAA National Water Prediction Service, gauge MDRI3, 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.