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Bench Mark Sheet for 8467150, Bridgeport CT

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 8467150                                PUBLICATION DATE:  12/20/2016
Name:       BRIDGEPORT, BRIDGEPORT HARBOR                     
            CT
NOAA Chart: 12369                                  Latitude:         41° 10.4' N
USGS Quad:  BRIDGEPORT                             Longitude:        73° 10.9' W


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)              PID:         
SETTING CLASSIFICATION:  T-shaped bridge pier


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.



                         BENCH MARK STAMPING:  14 1942
                         DESIGNATION:          846 7150 TIDAL 14

MONUMENTATION:           Tidal Station disk                        VM#:      250
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  LX0852
SETTING CLASSIFICATION:  Granite landing


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.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8467150                                PUBLICATION DATE:  12/20/2016
Name:       BRIDGEPORT, BRIDGEPORT HARBOR                     
            CT
NOAA Chart: 12369                                  Latitude:         41° 10.4' N
USGS Quad:  BRIDGEPORT                             Longitude:        73° 10.9' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  7150 F 2001
                         DESIGNATION:          846 7150 F

MONUMENTATION:           Tidal Station disk                        VM#:    16532
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete drawbridge support


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.



                         BENCH MARK STAMPING:  7150 G 2016
                         DESIGNATION:          846 7150 G

MONUMENTATION:           Tidal Station disk                        VM#:    22160
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Seawall


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)              PID:         
SETTING CLASSIFICATION:  Pier


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  3 of  5

                                                                                
Station ID: 8467150                                PUBLICATION DATE:  12/20/2016
Name:       BRIDGEPORT, BRIDGEPORT HARBOR                     
            CT
NOAA Chart: 12369                                  Latitude:         41° 10.4' N
USGS Quad:  BRIDGEPORT                             Longitude:        73° 10.9' W


                         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)              PID:         
SETTING CLASSIFICATION:  Bridge abutment


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  4 of  5

                                                                                
Station ID: 8467150                                PUBLICATION DATE:  12/20/2016
Name:       BRIDGEPORT, BRIDGEPORT HARBOR                     
            CT
NOAA Chart: 12369                                  Latitude:         41° 10.4' N
USGS Quad:  BRIDGEPORT                             Longitude:        73° 10.9' W


                            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  5 of  5

                                                                                
Station ID: 8467150                                PUBLICATION DATE:  12/20/2016
Name:       BRIDGEPORT, BRIDGEPORT HARBOR                     
            CT
NOAA Chart: 12369                                  Latitude:         41° 10.4' N
USGS Quad:  BRIDGEPORT                             Longitude:        73° 10.9' W


                             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 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.

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Products available at 8467150 Bridgeport, CT

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services