Bench Mark Sheet for 8447435, Chatham, Lydia Cove MA

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


From the intersection of state highway 28 and Main street in the village of
Chatham, proceed one block east on Main street, turn left on Seaview street and
continue 1.5 miles ( 2.4 km ) to Shore road, turn left on Shore road and go 0.8
miles (1.2 km) north on Shore road to the Chatham municipal fish pier on the
right. The bench marks are located in the vicinity of the fishing pier and the
seawall. The hydro gauge is located at the NE end of the docks by the U.S. Coast
Guard's small boats.


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


                 PRIMARY BENCH MARK STAMPING:  7435 B 1985
                         DESIGNATION:          844 7435 B TIDAL

MONUMENTATION:           DJ                                    VM#:        13534
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AA7166
SETTING CLASSIFICATION:                                        OPUS PID#: AA7166
LATITUDE:   41° 41.3' N (  41.68814)          LONGITUDE:  69° 57.1' W ( -69.95151)


The primary bench mark is a disk set in the north corner of the  2 m x 2 m (6 ft
x 6 ft) concrete pedistal for electrical transformer No. 60/010 located at the
Chatham Municipal Fish Pier, 31.55 m (103.5 ft) south of the south corner of the
Nickerson Fish Market, 11.95 m (39.2 ft) east of the SE corner of the
Dockmasters Building, 4.91 m (16.1 ft) NW of a red and white fire hydrant, and
0.20 m (0.67 ft) above the ground.

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

                                                                                
Station ID: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


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


                         BENCH MARK STAMPING:  7435 E 1985
                         DESIGNATION:          844 7435 E TIDAL

MONUMENTATION:           DJ                                    VM#:        13537
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AB7971
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   41° 41.4' N (  41.68953)          LONGITUDE:  69° 57.1' W ( -69.95133)


The bench mark is a disk set flush in a granite boulder on a rock seawall north
of the Chatham Municipal Fish Pier, 84 m (274 ft) north of bench mark 7435 D
1985, and 1.83 m (6.0 ft) east of the east face of the rock seawall.



                         BENCH MARK STAMPING:  7435 F 2009
                         DESIGNATION:          844 7435 F

MONUMENTATION:           DJ                                    VM#:        19157
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   41° 41.3' N (  41.68847)          LONGITUDE:  69° 57.1' W ( -69.95108)


In Chatham, at the Chatham municipal fish pier, on the NW end of the docks and
behind the Nickerson market building, the bench mark is set flush in the
concrete cap, 22.95 m (75.30 ft) SE of the NW end of the dock, 6.66 m (21.85 ft)
north of the NW corner of the Nickerson market building, 1.49 m (4.89 ft) NNW of
a metal light pole, and 0.34 m (1.12 ft) above the concrete deck.

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

                                                                                
Station ID: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


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


                         BENCH MARK STAMPING:  7435 G 2009
                         DESIGNATION:          844 7435 G

MONUMENTATION:           DJ                                    VM#:        19158
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   41° 41.3' N (  41.68836)          LONGITUDE:  69° 57.1' W ( -69.95125)


Located in Chatham, at the Chatham municipal fish pier, in the front of the
Nickerson market in the concrete loading ramp, the bench mark is set flush in
the concrete loading dock, 13.78 m (45.21ft) east of the SW corner of the
Nickerson building, 11.75 m (38.55 ft) west of the SE corner of the building,
2.15 m (7.05 ft) SE of the face of the Nickerson market building, 0.35 m (1.15
ft) above the road.

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

                                                                                
Station ID: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


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


                         BENCH MARK STAMPING:  Q 57 1996
                         DESIGNATION:          Q 57

MONUMENTATION:           F                                     VM#:        20266
AGENCY:                  CO-OPS                                IDB PID#:  AB7969
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   41° 40.9' N (  41.68156)          LONGITUDE:  69° 57.0' W ( -69.95061)


The bench mark is a flange encased rod located 34.95 m (114.7 ft) north of a
fire hydrant on the west side of Shore Road, 32.65 m (107.1 ft) SSW of the SW
corner of the garage at 168 Shore Road, 12.75 m (41.8 ft) east of phone pole
number 14, 7.30 m (24.0 ft) east of the Shore Road centerline, 5.70 m (18.7 ft)
south of the centerline of the shared gravel driveway of 168 and 166 Shore Road,
2.4 m (7.9 ft) north of the north end of a split rail fence, and 0.2 m (0.7 ft)
west of a witness post.  The datum point is set 3.5 cm (1 inch) below ground,
being the top of a stainless steel rod driven 22.7 (74.5 ft) to refusal, and
encased in a 5-inch NGS logo cap.

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

                                                                                
Station ID: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


                            T I D A L   D A T U M S 


Tidal datums at CHATHAM, LYDIA COVE based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           September 2015 - August 2016
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8449130 NANTUCKET ISLAND, NANTUCKET SOUND


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

     HIGHEST OBSERVED WATER LEVEL (01/03/2014)         =  2.976
     MEAN HIGHER HIGH WATER                     MHHW   =  1.679
     MEAN HIGH WATER                            MHW    =  1.565
     North American Vertical Datum              NAVD88 =  0.858
     MEAN SEA LEVEL                             MSL    =  0.843
     MEAN TIDE LEVEL                            MTL    =  0.811
     MEAN LOW WATER                             MLW    =  0.057
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/25/2011)         = -0.608

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7435 B 1985                                 4.680    3.115
     7435 E 1985                                 2.839    1.274
     7435 F 2009                                 3.027    1.462
     7435 G 2009                                 3.417    1.852
     Q 57 1996                                  12.480   10.915


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

                                                                                
Station ID: 8447435                         PUBLICATION DATE:  03/01/2017
Name:       CHATHAM, LYDIA COVE                               
            MA
NOAA Chart: 13248                           Latitude:   41° 41.3' N (  41.68847)
USGS Quad:  CHATHAM                         Longitude:  69° 57.1' W ( -69.95108)


                             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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