U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
To reach the tide station and tidal bench marks from Interstate 95 North, take
the East Main Street exit (exit 28), turn right (south) onto East Main Street,
and proceed for 0.11 km (0.07 mi). Turn at the first right onto Stratford
Avenue, and proceed for 0.12 km (0.08 mi). Turn at the first left at the light.
The tide station is located along the newly constructed river walk, across the
street from Bass Pro Shops. The bench marks are located along the river walk
and west along Stratford Ave.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7150 E 2001
DESIGNATION: 846 7150 E
MONUMENTATION: Tidal Station disk VM#: 16530
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: T-shaped bridge pier OPUS PID:
LATITUDE: 41° 10.7' N ( 41.17842) LONGITUDE: 73° 11.0' W ( -73.18286)
The primary bench mark is a disk set vertically on the south face of the first
T-shaped bridge pier support for I-95 North along the north side of Stratford
Avenue, 22.90 m (75.1 ft) east of a 3 legged support, 17.20 m (56.4 ft) west of
the centerline of Kossuth Street, 15.75 m (51.7 ft) north of the centerline of
Stratford Avenue, and 1.30 m (4.3 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 14 1942
DESIGNATION: 846 7150 TIDAL 14
MONUMENTATION: Tidal Station disk VM#: 250
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LX0852
SETTING CLASSIFICATION: Granite landing OPUS PID:
LATITUDE: 41° 10.7' N ( 41.17828) LONGITUDE: 73° 11.5' W ( -73.19125)
The bench mark is a disc set on top of the north end of the granite landing at
the broad street entrance to the law offices of Cohen and Wolf p.c., in the
United Illuminating company building, at the intersection of Broad street and
Cannon street, 14.20 m (46.6 ft) north of the north curb of Cannon street, 3.14
m (10.3 ft) west of the west curb of Broad street, and 0.17 m (0.6 ft) higher
than the sidewalk.
BENCH MARK STAMPING: 7150 F 2001
DESIGNATION: 846 7150 F
MONUMENTATION: Tidal Station disk VM#: 16532
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete drawbridge support OPUS PID:
LATITUDE: 41° 10.7' N ( 41.17911) LONGITUDE: 73° 11.1' W ( -73.18492)
The bench mark is a disk set in a concrete support for a drawbridge, 9.80 m
(32.2 ft) SE of a gate for traffic, 4.80 m (15.8 ft) NW of the SE end of a metal
handrail along the bridge, and 4.35 m (14.3 ft) North of the North curb of
Stratford Avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7150 G 2016
DESIGNATION: 846 7150 G
MONUMENTATION: Tidal Station disk VM#: 22160
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Seawall OPUS PID:
LATITUDE: 41° 10.5' N ( 41.17575) LONGITUDE: 73° 11.0' W ( -73.18392)
The bench mark is a disk set in a concrete seawall 6.18m (20.27 ft) NW of the
corner of hte concrete bulkhead, 4.05m (13.29 ft) SSE of a blue painted
shakespear pole, and 0.15m (0.49m) North of the edge of the seawall.
BENCH MARK STAMPING: 7150 H 2016
DESIGNATION: 846 7150 H
MONUMENTATION: Tidal Station disk VM#: 22161
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Pier OPUS PID:
LATITUDE: 41° 10.6' N ( 41.17694) LONGITUDE: 73° 11.0' W ( -73.18403)
The bench mark is a disk set in a concrete pier in the South end of the Hillard
Bloom shellfish company dock, 15.6m (51.2 ft) North of the South wall, 7.12m
(23.4 ft) East of the edge of pier and 3.35m (11.0 ft) West of gate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7150 J 2016
DESIGNATION: 846 7150 J
MONUMENTATION: Tidal Station disk VM#: 22162
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 41° 10.7' N ( 41.17861) LONGITUDE: 73° 11.1' W ( -73.18425)
The bench mark is a disk set in a bridge abutment of the I-95 overpass, behind a
railing located on Stratford Avenue, 7.1m (23.2 ft) South of South curb of
Stratford Avenue, 1.8m (5.9 ft) East of center of West most piling, and 0.85m
(2.78 ft) North of South edge of abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
T I D A L D A T U M S
Tidal datums at BRIDGEPORT, BRIDGEPORT HARBOR based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/30/2012) = 3.973
MEAN HIGHER HIGH WATER MHHW = 2.231
MEAN HIGH WATER MHW = 2.129
North American Vertical Datum NAVD88 = 1.171
MEAN SEA LEVEL MSL = 1.104
MEAN TIDE LEVEL MTL = 1.101
MEAN LOW WATER MLW = 0.074
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/02/1976) = -1.396
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7150 E 2001 5.591 3.462
14 1942 6.447 4.318
7150 F 2001 4.966 2.837
7150 G 2016 5.144 3.015
7150 H 2016 4.332 2.203
7150 J 2016 3.917 1.788
Foot Notes:
Bench marks 7150 G 2016, 7150 H 2016 and 7150 J 2016 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for these
marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8467150 PUBLICATION DATE: 12/20/2016
Name: BRIDGEPORT, BRIDGEPORT HARBOR
CT
NOAA Chart: 12369 Latitude: 41° 10.4' N ( 41.17330)
USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W ( -73.18170)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.