Long Island Sound at New Haven (IN MLLW)

Highest listed crest 10.58 ftFlood stage 8.7 ft5 crests since 1938

The Long Island Sound at New Haven (IN MLLW) crested above flood stage 2 times among the 5 crests the National Weather Service lists from 1938 to 2012. The highest, 10.58 ft on September 21, 1938, was moderate flooding, 1.88 feet above flood stage. 2 other gauges on the Long Island Sound crested above flood stage within a week of it, 2 at their own highest listed crest.

The gauge

Highest listed crest: 10.58 ft; September 21, 1938
Flood stage: 8.7 ft; Major flooding from 10.6 ft
Crests at major: 0; 2 above flood stage
Most recent flood crest: August 31, 1954; 9.58 ft, moderate flooding
Location: New Haven County; Near New Haven (2.1 mi), West Haven (3.2 mi), Milford (9.1 mi)
Identifiers: NWS NWHC3; USGS 8465705

Flood stages

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

Flood categories, Long Island Sound at New Haven (IN MLLW)

Flood stage (minor)	8.7	0	—	Minimal or no property damage, but possibly some public threat
Moderate flood stage	9.3	2	Aug 31, 1954	Some inundation of structures and roads near the stream
Major flood stage	10.6	0	—	Extensive inundation of structures and roads

Every listed crest

5 crests from 1938 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, Long Island Sound at New Haven (IN MLLW)

1	Sep 21, 1938	10.58	+1.88	Moderate	—
2	Aug 31, 1954	9.58	+0.88	Moderate	—
3	Oct 29, 2012	8.04	−0.66	Below flood stage	—
4	Nov 25, 1950	7.58	−1.12	Below flood stage	—
5	Sep 14, 1944	7.08	−1.62	Below flood stage	—

The worst floods along the Long Island Sound

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

September 21, 1938: 10.58 ft here, moderate flooding

Sands Point (IN MLLW)NY · Sep 21, 1938 · 16.75 ft · Major · its highest
New London Harbor (IN MLLW)CT · Sep 21, 1938 · 10.58 ft · Major · its highest

August 31, 1954: 9.58 ft here, moderate flooding

Sands Point (IN MLLW)NY · Aug 31, 1954 · 14.76 ft · Major
New London Harbor (IN MLLW)CT · Aug 31, 1954 · 9.58 ft · Major

Gauges on the Long Island Sound

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

Flood gauges on the Long Island Sound

New Haven (IN MLLW) this gauge	CT	8.7	10.58 ft, Sep 21, 1938	0
Sands Point (IN MLLW)	NY	10.0	16.75 ft, Sep 21, 1938	10
Bridgeport Harbor (IN MLLW)	CT	8.7	13.26 ft, Oct 29, 2012	3
New London Harbor (IN MLLW)	CT	5.0	10.58 ft, Sep 21, 1938	3

Other gauges in New Haven County

Flood gauges in New Haven County

Stevenson	11.0	24.50 ft, Aug 19, 1955	9
Beacon Falls	12.0	14.36 ft, Aug 28, 2011	1
Southbury	9.0	21.80 ft, Aug 19, 1955	7

New Haven County: every hazard · River floods across the country · Connecticut

NOAA National Water Prediction Service, gauge NWHC3, 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.