Peconic River at Riverhead (IN MLLW)

Highest listed crest 10.12 ftFlood stage 5.7 ft8 crests since 2005

The Peconic River at Riverhead (IN MLLW) crested at major flood stage 2 times among the 8 crests the National Weather Service lists from 2005 to 2012. The highest, 10.12 ft on October 29, 2012, was major flooding, 4.42 feet above flood stage.

The gauge

Highest listed crest: 10.12 ft; October 29, 2012
Flood stage: 5.7 ft; Major flooding from 7.2 ft
Crests at major: 2; 68th of 160 gauges in New York
Most recent flood crest: October 29, 2012; 10.12 ft, major flooding
Location: Suffolk County; New York
Identifiers: NWS PRIN6; USGS 01304562

Flood stages

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

Flood categories, Peconic River at Riverhead (IN MLLW)

Action stage	5.2	6	Apr 16, 2011	The level at which the NWS or its partners begin to take action
Flood stage (minor)	5.7	0	—	Minimal or no property damage, but possibly some public threat
Moderate flood stage	6.4	0	—	Some inundation of structures and roads near the stream
Major flood stage	7.2	2	Oct 29, 2012	Extensive inundation of structures and roads

Every listed crest

8 crests from 2005 to 2012. 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, Peconic River at Riverhead (IN MLLW)

1	Oct 29, 2012	10.12	+4.42	Major	—
2	Aug 28, 2011	7.35	+1.65	Major	—
3	Apr 16, 2007	5.67	−0.03	Action	—
4	Oct 18, 2009	5.53	−0.17	Action	—
5	Apr 16, 2011	5.47	−0.23	Action	—
6	Dec 12, 2008	5.45	−0.25	Action	—
7	Dec 1, 2006	5.42	−0.28	Action	—
8	Oct 25, 2005	5.38	−0.32	Action	—

Other gauges in Suffolk County

Flood gauges in Suffolk County

Old Field (IN MLLW)	9.2	10.12 ft, Oct 29, 2012	0
Great South Bay at Lindenhurst (IN MLLW)	3.1	7.73 ft, Oct 29, 2012	2
Great South Bay at Watch Hill (IN MLLW)	3.2	7.73 ft, Oct 29, 2012	1
Great South Bay at West Sayville (IN MLLW)	3.1	16.75 ft, Sep 21, 1938	10
Moriches Bay at Moriches Bay (IN MLLW)	4.3	7.73 ft, Oct 29, 2012	1
Orient (IN MLLW)	4.8	10.12 ft, Oct 29, 2012	2
Shelter Island (IN MLLW)	5.1	7.73 ft, Oct 29, 2012	1
Shinnecock Bay at Ponquogue (IN MLLW)	4.9	7.73 ft, Oct 29, 2012	1

Suffolk County: every hazard · River floods across the country · New York

NOAA National Water Prediction Service, gauge PRIN6, 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.