Bench Mark Sheet for 8415191, BELFAST, PENOBSCOT BAY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8415191                         PUBLICATION DATE:  07/26/2004
Name:       BELFAST, PENOBSCOT BAY                            
            ME
NOAA Chart: 13309                           Latitude:   44° 25.6' N (  44.42670)
USGS Quad:  BELFAST                         Longitude:  69°  0.3' W ( -69.00500)


To reach the tidal bench marks from the intersection of U.S. Highway 1 and State
Route 7, proceed SE towards Belfast on State Route 7 for 0.9 km (0.6 mi) to the
first traffic light, then turn left and proceed ENE on Main Street and head down
the hill towards the bay.  The bench marks are along Main Street and extend east
along the railroad tracks.  The tide gauge and staff were on the pier adjacent
to the John and Mary Enk's Memorial boat landing at the end of Main Street.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8415191                         PUBLICATION DATE:  07/26/2004
Name:       BELFAST, PENOBSCOT BAY                            
            ME
NOAA Chart: 13309                           Latitude:   44° 25.6' N (  44.42670)
USGS Quad:  BELFAST                         Longitude:  69°  0.3' W ( -69.00500)


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


                 PRIMARY BENCH MARK STAMPING:  NO 7 1947
                         DESIGNATION:          TIDAL 7 STA 31

MONUMENTATION:           Tidal Station disk                    VM#:         1870
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  PE0904
SETTING CLASSIFICATION:  Rock ledge                            OPUS PID:        
LATITUDE:   44° 25.5' N (  44.42500)          LONGITUDE:  69°  0.0' W ( -69.00000)


The primary bench mark is a disk set on the third noticeable rock ledge along
the beach, 0.8 km (0.5 mi) SE of the first bridge in Belfast (bridge no longer
in use), 117 m (385 ft) SE of the partially burned remains of Wyman Lumber
Company at the foot of Commerical Street, and 15 m (49 ft) SE of bench mark NO 2
1911.

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

                                                                                
Station ID: 8415191                         PUBLICATION DATE:  07/26/2004
Name:       BELFAST, PENOBSCOT BAY                            
            ME
NOAA Chart: 13309                           Latitude:   44° 25.6' N (  44.42670)
USGS Quad:  BELFAST                         Longitude:  69°  0.3' W ( -69.00500)


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


                         BENCH MARK STAMPING:  NO 2 1911
                         DESIGNATION:          TIDAL 2 STA 31

MONUMENTATION:           Tidal Station disk                    VM#:         1868
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  PE0902
SETTING CLASSIFICATION:  Rock ledge                            OPUS PID:        
LATITUDE:   44° 25.5' N (  44.42500)          LONGITUDE:  69°  0.0' W ( -69.00000)


The bench mark is a disk set in the center of a 0.6 m (2 ft) vertical face of
the second noticeable rock ledge along the beach, 0.8 km (0.5 mi) SE of the
first bridge in Belfast (bridge is no longer used), and 102 m (335 ft) SE of the
partially burned remains of Wyman Lumber Company on property now owned by
Penabscat Poultry Company at the foot of Commercial Street.



                         BENCH MARK STAMPING:  5191 A 1983
                         DESIGNATION:          841 5191 A

MONUMENTATION:           Tidal Station disk                    VM#:         1871
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Flagpole foundation                   OPUS PID:        
LATITUDE:   44° 25.6' N (  44.42670)          LONGITUDE:  69°  0.2' W ( -69.00330)


The bench mark is a disk set in the flagpole foundation at Steego Auto Parts
store at the corner of Main and Water Streets, 11.28 m (37.0 ft) north of the
centerline of Main Street, 5.76 m (18.9 ft) south of the SE corner of the auto
parts store, and 4.81 m (15.8 ft) west of the telephone pole at the Main and
Water Streets intersection.

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

                                                                                
Station ID: 8415191                         PUBLICATION DATE:  07/26/2004
Name:       BELFAST, PENOBSCOT BAY                            
            ME
NOAA Chart: 13309                           Latitude:   44° 25.6' N (  44.42670)
USGS Quad:  BELFAST                         Longitude:  69°  0.3' W ( -69.00500)


                            T I D A L   D A T U M S 


Tidal datums at BELFAST, PENOBSCOT BAY based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           May 1984 - June 1984
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8415490 ROCKLAND


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

     MEAN HIGHER HIGH WATER                     MHHW   =  3.362
     MEAN HIGH WATER                            MHW    =  3.238
     North American Vertical Datum              NAVD88 =  1.776
     MEAN SEA LEVEL                             MSL    =  1.695
     MEAN TIDE LEVEL                            MTL    =  1.679
     MEAN LOW WATER                             MLW    =  0.120
     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 7 1947                                   5.523    2.285
     NO 2 1911                                   5.003    1.765
     5191 A 1983                                13.404   10.166


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

                                                                                
Station ID: 8415191                         PUBLICATION DATE:  07/26/2004
Name:       BELFAST, PENOBSCOT BAY                            
            ME
NOAA Chart: 13309                           Latitude:   44° 25.6' N (  44.42670)
USGS Quad:  BELFAST                         Longitude:  69°  0.3' W ( -69.00500)


                             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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