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Bench Mark Sheet for 8463836, HIGGANUM CREEK, CONNECTICUT R. 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


To reach the tidal bench marks from the intersection of State Road 154 and
Landing Road (0.40 km (0.25 mi) south of the village of Higganum), proceed east
on Landing Road for 0.2 km (0.1 mi), turn right and continue on Landing Road for
0.3 km (0.2 mi) to a left turn which is a further continuation of Landing Road,
then north along the river front for 0.24 km (0.15 mi) to the end of the road. 
The bench marks are along the river from the road to the railroad trestle to the
north.  The tide gage and staff were offshore SE of the channel range light.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1969
                         DESIGNATION:          846 3836 TIDAL 1

MONUMENTATION:           Bench Mark disk                       VM#:         2250
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Bridge pier                           OPUS PID:        
LATITUDE:   41° 30.1' N (  41.50170)          LONGITUDE:  72° 33.0' W ( -72.55000)


The primary bench mark is a disk set in the top of the SW corner of the
southernmost pier of the abandoned railroad bridge over Higganum Creek, 4.88 m
(16.0 ft) north of the NW corner of a wooden abutment, 2.99 m (9.8 ft) west of
the centerline of the tracks, and 0.3 m (1.0 ft) east of the west edge of the
pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


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


                         BENCH MARK STAMPING:  NO 5 1917
                         DESIGNATION:          846 3836 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         2247
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock bridge pier                      OPUS PID:        
LATITUDE:   41° 30.1' N (  41.50170)          LONGITUDE:  72° 33.0' W ( -72.55000)


The bench mark is a disk set flush in the NE corner of the abandoned northern
granite rock pier of the railroad bridge over Higganum Creek, 41 m (136 ft)
north of bench mark NO 1 1969, 3 m (10 ft) east of the centerline of the tracks,
and 0.15 m (0.5 ft) west of the east edge of the pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


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


                         BENCH MARK STAMPING:  GROUT 1934
                         DESIGNATION:          GROUT

MONUMENTATION:           Triangulation Station disk            VM#:         2248
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  LX6877
SETTING CLASSIFICATION:  Granite outcrop                       OPUS PID:        
LATITUDE:   41° 30.1' N (  41.50170)          LONGITUDE:  72° 33.0' W ( -72.55000)


The bench mark is a disk set atop a granite outcrop north of the concrete base
of range marker #61, 0.40 km (0.25 mi) south of the railroad bridge over
Higganum Creek, 20.06 m (65.8 ft) east of bench mark GROUT NO 1 1934, 1.55 m
(5.1 ft) north of the east corner of the base, and 0.76 m (2.5 ft) NE of the
north face of the base.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


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


                         BENCH MARK STAMPING:  GROUT NO 1 1934
                         DESIGNATION:          GROUT RM 1

MONUMENTATION:           Reference Mark disk                   VM#:         2249
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC8377
SETTING CLASSIFICATION:  Granite outcrop                       OPUS PID:        
LATITUDE:   41° 30.1' N (  41.50170)          LONGITUDE:  72° 33.0' W ( -72.55000)


The bench mark is a disk set atop a granite outcrop 0.40 km (0.25 mi) south of
the railroad bridge over Higgnaum Creek, 24 m (78 ft) north of the north corner
of a two-story frame residence, 18.59 m (61.0 ft) west of the north corner of
the concrete base of range marker #61, and 9.45 m (31.0 ft) north of the north
corner of a stone retaining wall.



                         BENCH MARK STAMPING:  3836 E 1987
                         DESIGNATION:          846 3836 E

MONUMENTATION:           Tidal Station disk                    VM#:         2251
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   41° 30.1' N (  41.50170)          LONGITUDE:  72° 33.0' W ( -72.55000)


The bench mark is a disk set in the granite base of the south end of the
retaining wall in front of the three-story red frame residence at 50 Landing
Road (Mrs. Scott's house), 26.97 m (88.5 ft) SSE of the sidewalk to the main
entrance of the house, 19.87 m (65.2 ft) NW of power pole #193, 5.18 m (17.0 ft)
west of the center of Landing Road, and at ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


                            T I D A L   D A T U M S 


Tidal datums at HIGGANUM CREEK, CONNECTICUT R. based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           June 1987 - September 1987
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8461490 NEW LONDON, THAMES RIVER


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.832
     MEAN HIGH WATER                            MHW    =  0.762
     MEAN SEA LEVEL                             MSL    =  0.400
     MEAN TIDE LEVEL                            MTL    =  0.396
     MEAN LOW WATER                             MLW    =  0.030
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1969                                   4.732    3.970
     NO 5 1917                                   4.877    4.115
     GROUT 1934                                  1.049    0.287
     GROUT NO 1 1934                             1.850    1.088
     3836 E 1987                                 5.645    4.883


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8463836                         PUBLICATION DATE:  05/15/2003
Name:       HIGGANUM CREEK, CONNECTICUT R.                    
            CT
NOAA Chart: 12377                           Latitude:   41° 30.2' N (  41.50330)
USGS Quad:  Middle Haddam                   Longitude:  72° 33.2' W ( -72.55330)


                             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.

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Products available at 8463836 HIGGANUM CREEK, CONNECTICUT R., CT

Revised: 10/15/2013
NOAA / National Ocean Service
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