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Bench Mark Sheet for 8410834, Pettegrove Point, Dochet Island ME

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8410834                         PUBLICATION DATE:  11/19/2010
Name:       PETTEGROVE POINT, DOCHET ISLAND                   
            ME
NOAA Chart: 13398                           Latitude:   45°  7.7' N (  45.12844)
USGS Quad:  DEVILS HEAD                     Longitude:  67°  8.7' W ( -67.14467)


To reach the tide station from the Post Office in Robbinston Maine travel north
on US Route 1 (River Rd) 5.47 km (3.4 mi), turn right onto St. Croix Drive
travel north around the bend for 0.32 km (0.2 mi) to 60 St Croix Drive on the
right, on the northern end of the property near the road is the gated beginning
of a dirt road, follow the dirt road generally west for 0.23 km (0.14 mi) down
to the lower lawn of the same property, cross the lawn 87 m (286 ft) to the WNW
to the station.  The tide house was on the knoll at the end of the point out
into the St Croix river and the bench marks are in the lawn and the beach
surrounding it.  


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


                 PRIMARY BENCH MARK STAMPING:  0834 A 2010
                         DESIGNATION:          8410834 A

MONUMENTATION:           Tidal Station disk                    VM#:        19718
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  bedrock                               OPUS PID:        
LATITUDE:   45°  7.6' N (  45.12692)          LONGITUDE:  67°  8.7' W ( -67.14561)


The primary bench mark is set flush in bedrock on the southern end of the beach
that forms the southern side of Pettegrove Point, 61.59 m (202.1 ft) SSW of
bench mark 8410834 B, 55.35 m (181.6 ft) SSW of the southern most corner of the
beach shack on the point, 13.30 m (43.6 ft) SSE of the center of the end of a
small ravine cut into the southern end of the bank that runs SW to NE above the
beach, and 1.24 m (4.1 ft) above the beach

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

                                                                                
Station ID: 8410834                         PUBLICATION DATE:  11/19/2010
Name:       PETTEGROVE POINT, DOCHET ISLAND                   
            ME
NOAA Chart: 13398                           Latitude:   45°  7.7' N (  45.12844)
USGS Quad:  DEVILS HEAD                     Longitude:  67°  8.7' W ( -67.14467)


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


                         BENCH MARK STAMPING:  Unstamped
                         DESIGNATION:          8410834 Wilson

MONUMENTATION:           Tidal Station disk                    VM#:        19719
AGENCY:                  US Coast & Geodetic Survey            IDB PID#:  QF0693
SETTING CLASSIFICATION:  burried boulder                       OPUS PID:        
LATITUDE:   45°  7.7' N (  45.12839)          LONGITUDE:  67°  8.7' W ( -67.14472)


The bench mark is set flush in the top of a buried boulder on the northern end
of the tree and grass covered knoll near the end of Pettegrove Point, 117.9 m
(386 ft) NW of bench mark 8410834 C, 46.10 m (151.2 ft) north of the center of
the northwestern end of the sandbar section of the point where it meets the
rocky islet end, 4.30 m (14.1 ft) south of the line where the rock changes in
color from black to red, and 2.30 m (7.5 ft) north of tree line.



                         BENCH MARK STAMPING:  0834 B 2010
                         DESIGNATION:          8410834 B

MONUMENTATION:           Tidal Station disk                    VM#:        19720
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  bedrock                               OPUS PID#: BBCB15
LATITUDE:   45°  7.6' N (  45.12739)          LONGITUDE:  67°  8.7' W ( -67.14525)


The bench mark is set flush in the top of exposed bedrock on the beach that
forms the southern side of the base of Pettegrove Point, 61.59 m (202.1 ft) NNE
of bench mark 8410834 A, 58.13 m (190.7 ft) SE of bench mark 8410834 C, 52.90 m
(173.6 ft) NE of the center of the end of a small ravine cut into the embankment
above the southern end of the beach, 18.75 m (61.5 ft) SE of the southern most
corner of the beach shack on the point, and 12.50 m (41.0 ft) SE of the
vegetation line along the top of the beach.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8410834                         PUBLICATION DATE:  11/19/2010
Name:       PETTEGROVE POINT, DOCHET ISLAND                   
            ME
NOAA Chart: 13398                           Latitude:   45°  7.7' N (  45.12844)
USGS Quad:  DEVILS HEAD                     Longitude:  67°  8.7' W ( -67.14467)


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


                         BENCH MARK STAMPING:  0834 C 2010
                         DESIGNATION:          8410834 C

MONUMENTATION:           Tidal Station disk                    VM#:        19721
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  bedrock outcrop                       OPUS PID#: BBBW07
LATITUDE:   45°  7.7' N (  45.12772)          LONGITUDE:  67°  8.7' W ( -67.14581)


The bench mark is set flush in the top of exposed bedrock ledge extending NNE
into the water on the beach that forms the northern side of the base of
Pettegrove Point, 117.9 m (386 ft) SE of bench mark 8410834 WILSON, 64.32 m
(211.0 ft) NE of bench mark 8410834 D, 58.13 m (190.7 ft) NW of bench mark
8410834 B, 38.94 m (127.8 ft) NNE of the northern most corner of the beach shack
on the point, and 4.20 m (13.8 ft) NE of the edge of vegetation.



                         BENCH MARK STAMPING:  0834 D 2010
                         DESIGNATION:          8410834 D

MONUMENTATION:           Tidal Station disk                    VM#:        19722
AGENCY:                  National Oceaan Service (NOS)         IDB PID#:        
SETTING CLASSIFICATION:  boulder                               OPUS PID:        
LATITUDE:   45°  7.6' N (  45.12733)          LONGITUDE:  67°  8.8' W ( -67.14628)


The bench mark is set flush in the top of a partially buried 2.72 m x 1.39 m x
0.61 m (8.9 ft x 4.6 ft x 2.0 ft) boulder on the western side of the lawn at the
base of Pettegrove Point, 64.32 m (211.0 ft) SW of bench mark 8410834 C, 14.17 m
(46.5 ft) SSE of the centerline of the end of the dirt road that leads down to
the lawn from St Croix Drive, 5.49 m (18.0 ft) east of the western edge of the
lawn, and 0.61 m (2.0 ft) above grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8410834                         PUBLICATION DATE:  11/19/2010
Name:       PETTEGROVE POINT, DOCHET ISLAND                   
            ME
NOAA Chart: 13398                           Latitude:   45°  7.7' N (  45.12844)
USGS Quad:  DEVILS HEAD                     Longitude:  67°  8.7' W ( -67.14467)


                            T I D A L   D A T U M S 


Tidal datums at PETTEGROVE POINT, DOCHET ISLAND based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           April 2010 - October 2010
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8410140 EASTPORT, PASSAMAQUODDY BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  6.252
     MEAN HIGH WATER                            MHW    =  6.104
     MEAN SEA LEVEL                             MSL    =  3.129
     MEAN TIDE LEVEL                            MTL    =  3.121
     MEAN LOW WATER                             MLW    =  0.138
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0834 A 2010                                 7.594    1.490
     Unstamped                                   8.158    2.054
     0834 B 2010                                 6.759    0.655
     0834 C 2010                                 7.239    1.135
     0834 D 2010                                12.308    6.204


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

                                                                                
Station ID: 8410834                         PUBLICATION DATE:  11/19/2010
Name:       PETTEGROVE POINT, DOCHET ISLAND                   
            ME
NOAA Chart: 13398                           Latitude:   45°  7.7' N (  45.12844)
USGS Quad:  DEVILS HEAD                     Longitude:  67°  8.7' W ( -67.14467)


                             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 8410834 Pettegrove Point, Dochet Island, ME

Revised: 08/08/2018
NOAA / National Ocean Service
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