Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins
Click to hide state-specific text


! We're replacing this page with a Next Generation Monitoring Location Page.
We're modernizing Water Data for the Nation delivery. Find out what this means for you. This page will be discontinued Jan.1, 2023.

USGS 01411350 Ludlum Thorofare at Sea Isle City NJ


Click to hidestation-specific text
During winter months, cold and ice may result in inaccurate real-time tide elevation data. Adjustments or deletions of this data can only be done after detailed analysis.



LOCATION.--Lat 39°09'28", long 74°41'52" referenced to North American Datum of 1983, Sea Isle City, Cape May County, NJ, Hydrologic Unit 02040302, on a four-pile structure at the northwestern end of 43rd Place, 380 ft northeast of the end of Old Sea Isle Boulevard, 630 ft south of the center of the channel under the John F Kennedy Boulevard bridge, 1,400 ft west of the Sea Isle City Police Department.
PERIOD OF RECORD.--Continuous-record tide gage, May 1975 to May 1978, February 2000 to current year. Annual maximum tide, October 1978 to September 1984. Unpublished fragmentary gage-height record, May 1997 to January 2000.
GAGE.--Tide elevation and water temperature recorder with telemetry and tidal crest-stage gage. Datum of gage is at 0.00 ft NAVD of 1988. To determine approximate elevations to NGVD of 1929, add 1.27 ft. From May 1975 to May 1978, the tide elevation and water temperature recorder was located at 44th Street, 800 ft southwest of current station and datum of gage at 0.00 ft NGVD of 1929. From October 1978 to September 1984, tidal crest-stage gage located at 44th Street, 800 ft southwest of current station and datum of gage at 0.00 ft NGVD of 1929. Data published to NGVD of 1929 can be adjusted to NAVD of 1988 by subtracting 1.27 ft. Online peaks have been adjusted to present datum.
REMARKS.--Gage cannot measure tide elevation below -3.00 ft. Tide elevations below -3.00 have been estimated. From Jul 25, 2005 to Jun 2, 2009, gage could not measure tide elevation below -2.8 ft; from Aug 13, 2003 to Jul 25, 2005, gage could not measure tide elevation below -1.50 ft; prior to Aug 13, 2003, gage could not measure tide elevation below 2.85 ft. Periods of missing data are noted by dashed (---) lines.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 7.56 ft, Oct 29, 2012, from crest-stage gage; minimum elevation, undetermined, likely occurred Feb 17, 2007 as indicated by nearby reference gages
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum elevation known, 6.14 ft, adjusted to present datum, Dec 11, 1992, from high-water marks at northwest end of Third Street just south of Sea Isle City Boulevard leading into Sea Isle City.

Peak Flood Chart

Gage Photo

Weather station data are available from this location at this link.

The water temperature data for this station are temporary and will only be displayed for 120 days. Although the instrumentation is calibrated at least once/year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.

This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
2021-06-18  2021-10-16
2000-02-02  2021-10-16


  -- or --



Summary of all available data for this site
Instantaneous-data availability statement

Tidal elevation, NOS-averaged, NAVD88, feet

Most recent instantaneous value: 0.30 10-16-2021   14:18 EDT
Graph of  Tidal elevation, NOS-averaged, NAVD88, feet

Add up to 2 more sites and replot for "Tidal elevation, NOS-averaged, NAVD88, feet"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages