Rock River at Como

Highest listed crest 15.64 ftFlood stage 12.5 ft7 crests since 2015

The Rock River at Como crested above flood stage 5 times among the 7 crests the National Weather Service lists from 2015 to 2024. The highest, 15.64 ft on July 23, 2017, was moderate flooding, 3.14 feet above flood stage. 8 other gauges on the Rock River crested above flood stage within a week of it.

The gauge

Highest listed crest: 15.64 ft; July 23, 2017; 42,200 cubic feet per second
Flood stage: 12.5 ft; Major flooding from 18.0 ft
Crests at major: 0; 5 above flood stage
Most recent flood crest: July 16, 2024; 12.97 ft, minor flooding
Location: Whiteside County; Near Sterling (3.2 mi), Dixon (14.6 mi)
Identifiers: NWS CMOI2; USGS 05443500

Flood stages

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

Flood categories, Rock River at Como

Action stage	10.0	1	Jun 16, 2015	The level at which the NWS or its partners begin to take action
Flood stage (minor)	12.5	4	Jul 16, 2024	Minimal or no property damage, but possibly some public threat
Moderate flood stage	15.5	1	Jul 23, 2017	Some inundation of structures and roads near the stream
Major flood stage	18.0	0	—	Extensive inundation of structures and roads

Every listed crest

7 crests from 2015 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Crests at or above flood stage, by decade

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.
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, Rock River at Como

1	Jul 23, 2017	15.64	+3.14	Moderate	42,200
2	Mar 16, 2019	15.18	+2.68	Minor	39,900
3	Feb 21, 2018	14.68	+2.18	Minor	36,900
4	Oct 5, 2019	13.30	+0.80	Minor	31,900
5	Jul 16, 2024	12.97	+0.47	Minor	28,567
6	Jun 16, 2015	11.64	−0.86	Action	23,800
7	Dec 15, 2015	9.86	−2.64	Below flood stage	19,400

The worst floods along the Rock River

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

July 23, 2017: 15.64 ft here, moderate flooding

JoslinIL · Jul 25, 2017 · 18.51 ft · Major
MolineIL · Jul 26, 2017 · 15.40 ft · Major
ByronIL · Jul 22, 2017 · 15.38 ft · Moderate
RocktonIL · Jul 28, 2017 · 13.14 ft · Moderate
Latham ParkIL · Jul 28, 2017 · 12.55 ft · Moderate
DixonIL · Jul 22, 2017 · 17.72 ft · Minor
AftonWI · Jul 21, 2017 · 9.36 ft · Minor
Rockford (Auburn Street)IL · Jul 28, 2017 · 6.03 ft · Minor

March 16, 2019: 15.18 ft here, minor flooding

JoslinIL · Mar 16, 2019 · 18.51 ft · Major
ByronIL · Mar 16, 2019 · 16.64 ft · Major
MolineIL · Mar 17, 2019 · 15.57 ft · Major
RocktonIL · Mar 17, 2019 · 15.13 ft · Major
Latham ParkIL · Mar 17, 2019 · 14.46 ft · Major
JeffersonWI · Mar 16, 2019 · 11.50 ft · Moderate
DixonIL · Mar 16, 2019 · 17.67 ft · Minor
Lebanon-3 E-Hwy MM bridgeWI · Mar 18, 2019 · 10.98 ft · Minor
Rockford (Auburn Street)IL · Mar 18, 2019 · 7.43 ft · Minor
Rockford (Fordam Dam)IL · Mar 17, 2019 · 4.06 ft · Minor

February 21, 2018: 14.68 ft here, minor flooding

JoslinIL · Feb 23, 2018 · 18.36 ft · Major
MolineIL · Feb 24, 2018 · 15.32 ft · Major
ByronIL · Feb 22, 2018 · 15.15 ft · Moderate
RocktonIL · Feb 26, 2018 · 13.51 ft · Moderate
Latham ParkIL · Feb 26, 2018 · 12.80 ft · Moderate
AftonWI · Feb 21, 2018 · 11.12 ft · Moderate
DixonIL · Feb 21, 2018 · 16.61 ft · Minor
Rockford (Auburn Street)IL · Feb 26, 2018 · 6.37 ft · Minor

Gauges on the Rock River

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

Flood gauges on the Rock River

Afton	WI	9.0	13.51 ft, Jun 21, 2008	3
Byron	IL	13.0	17.80 ft, Apr 20, 1973	5
Como this gauge	IL	12.5	15.64 ft, Jul 23, 2017	0
Dixon	IL	16.0	20.50 ft, Apr 20, 1973	1
Fort Atkinson	WI	16.0	20.90 ft, Jun 15, 2008	2
Jefferson	WI	10.0	15.64 ft, Jun 19, 2008	1
Lake Koshkonong	WI	10.0	15.13 ft, Jun 21, 2008	6
Latham Park	IL	9.0	14.70 ft, Mar 26, 1975	3
Lebanon-3 E-Hwy MM bridge	WI	10.0	14.01 ft, Jun 15, 2008	1
Moline	IL	12.0	16.53 ft, Apr 22, 2013	34
Newville	WI	6.5	8.51 ft, Apr 23, 2013	1
Rockford (Auburn Street)	IL	6.0	10.00 ft, Apr 20, 1881	1
Rockford (Fordam Dam)	IL	4.0	6.50 ft, Apr 20, 1881	1
Rockton	IL	10.0	15.54 ft, Mar 25, 1975	4
Watertown	WI	5.5	7.81 ft, Jun 13, 2008	2
Joslin	IL	12.0	19.24 ft, Jun 7, 2002	24

Other gauges in Whiteside County

Flood gauges in Whiteside County

Fulton	16.0	24.75 ft, Apr 28, 1965	13

Whiteside County: every hazard · River floods across the country · Illinois

NOAA National Water Prediction Service, gauge CMOI2, 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.