Turtle Creek at Beloit

Highest listed crest 13.00 ftFlood stage 7.5 ft10 crests since 1973

The Turtle Creek at Beloit crested at major flood stage 1 time among the 10 crests the National Weather Service lists from 1973 to 2019. The highest, 13.00 ft on April 21, 1973, was major flooding, 5.50 feet above flood stage. 2 other gauges on the Turtle Creek crested above flood stage within a week of it, 2 at their own highest listed crest.

The gauge

Highest listed crest: 13.00 ft; April 21, 1973
Flood stage: 7.5 ft; Major flooding from 12.5 ft
Crests at major: 1; 64th of 143 gauges in Wisconsin
Most recent flood crest: October 3, 2019; 8.39 ft, minor flooding
Location: Rock County; Near Beloit (1.8 mi), Roscoe (5.0 mi), Machesney Park (9.0 mi)
Identifiers: NWS BOIW3; Out of service

Flood stages

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

Flood categories, Turtle Creek at Beloit

Action stage	6.0	2	Jul 23, 2017	The level at which the NWS or its partners begin to take action
Flood stage (minor)	7.5	6	Oct 3, 2019	Minimal or no property damage, but possibly some public threat
Moderate flood stage	10.5	1	Feb 21, 2018	Some inundation of structures and roads near the stream
Major flood stage	12.5	1	Apr 21, 1973	Extensive inundation of structures and roads

Every listed crest

10 crests from 1973 to 2019. 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, Turtle Creek at Beloit

1	Apr 21, 1973	13.00	+5.50	Major	—
2	Feb 21, 2018	11.70	+4.20	Moderate	7,207
3	Sep 14, 2019	9.72	+2.22	Minor	3,866
4	Oct 7, 2018	9.29	+1.79	Minor	3,468
5	Mar 14, 2019	9.07	+1.57	Minor	3,249
6	Jun 20, 2018	8.84	+1.34	Minor	3,031
7	Jan 18, 2017	8.40	+0.90	Minor	2,638
8	Oct 3, 2019	8.39	+0.89	Minor	2,630
9	Jul 23, 2017	7.05	−0.45	Action	1,683
10	Dec 15, 2015	6.24	−1.26	Action	1,027

The worst floods along the Turtle Creek

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

April 21, 1973: 13.00 ft here, major flooding

ClintonWI · Apr 21, 1973 · 15.30 ft · Major · its highest
Beloit-3 NEWI · Apr 21, 1973 · 14.20 ft · Major · its highest

February 21, 2018: 11.70 ft here, moderate flooding

ClintonWI · Feb 20, 2018 · 10.65 ft · Minor

September 14, 2019: 9.72 ft here, minor flooding

ClintonWI · Sep 13, 2019 · 10.59 ft · Minor

Gauges on the Turtle Creek

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

Flood gauges on the Turtle Creek

Beloit this gauge	WI	7.5	13.00 ft, Apr 21, 1973	1
Beloit-3 NE	WI	9.0	14.20 ft, Apr 21, 1973	1
Clinton	WI	8.0	15.30 ft, Apr 21, 1973	2

Other gauges in Rock County

Flood gauges in Rock County

Afton	9.0	13.51 ft, Jun 21, 2008	3
Newville	6.5	8.51 ft, Apr 23, 2013	1
Beloit-3 NE	9.0	14.20 ft, Apr 21, 1973	1
Clinton	8.0	15.30 ft, Apr 21, 1973	2
Fulton	10.0	12.07 ft, Jun 26, 2013	1

Rock County: every hazard · River floods across the country · Wisconsin

NOAA National Water Prediction Service, gauge BOIW3, 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.