U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 11/13/1989
Station ID: 8410875 SUPERCEDED DATE: 04/21/2003
Name: BIRCH ISLANDS, WHITING BAY
MAINE
NOAA Chart: 13328 Latitude: 44° 52.5' N
USGS Quad: PEMBROKE Longitude: 67° 9.5' W
To reach the tidal bench marks from the intersection of U.S. Highway 1 north
bound and the entrance road to Cobscook State Park, proceed right into the park
and go 2.0 miles (3.2 km) along the paved road, turn right and go 0.35 mile
(0.56 km) along a private gravel road to Bergmanns house and property. The
bench marks are east of the bank near the approximate high water line. The tide
gage and staff were off the SE point of land.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0875 C 1985
MONUMENTATION: Survey Disk VM#: 1843
AGENCY: PID:
SETTING CLASSIFICATION: Rock Outcropping
The bench mark is set in the top of a rock outcrop SE of Bergmanns house, 10.0
feet (3.0 m) west of the approximate high water line, 4.5 feet (1.4 m) east of
the face of the rock cliff, and 5.0 feet (1.5 m) above the surrounding beach
level.
BENCH MARK STAMPING: 0875 A 1985
MONUMENTATION: Survey Disk VM#: 1841
AGENCY: PID:
SETTING CLASSIFICATION: Rock Outcropping
The bench mark is set in the top of the most northeasterly rock outcropping on
Bergmanns property, 9.0 feet (2.7 m) east of the face of the rock cliff, 2.0
feet (0.6 m) SSW of the approximate high water line, and 0.8 foot (0.2 m) above
the surrounding beach level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 11/13/1989
Station ID: 8410875 SUPERCEDED DATE: 04/21/2003
Name: BIRCH ISLANDS, WHITING BAY
MAINE
NOAA Chart: 13328 Latitude: 44° 52.5' N
USGS Quad: PEMBROKE Longitude: 67° 9.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0875 B 1985
MONUMENTATION: Survey Disk VM#: 1842
AGENCY: PID:
SETTING CLASSIFICATION: Rock Outcropping
The bench mark is set in the top of the most northeasterly rock outcropping on
Bergmanns property, 10.7 feet (3.3 m) NW of Bench Mark 0875 A 1985, 6.7 feet
(2.0 m) NNE of the face of the rock cliff, 1.2 feet (0.4 m) SSW of the
approximate high water line, and 0.8 foot (0.2 m) above the surrounding beach
level.
BENCH MARK STAMPING: 0875 D 1985
MONUMENTATION: Survey Disk VM#: 1844
AGENCY: PID:
SETTING CLASSIFICATION: Rock Outcropping
The bench mark is set in the top of the rock ledge at the SE corner marker of
Bergmanns property, 123.3 feet (37.6 m) south of Bench Mark 0875 C 1985, 0.8
foot (0.2 m) east of the face of the rock cliff, and about level with the beach.
BENCH MARK STAMPING: 0875 E 1985
MONUMENTATION: Survey Disk VM#: 1845
AGENCY: PID:
SETTING CLASSIFICATION: Rock Outcropping
The bench mark is set in the top of the rock ledge south of the SE corner marker
of Bergmanns property, 29.8 feet (9.1 m) SW of Bench Mark 0875 D 1985, 4.0 feet
(1.2 m) east of the face of the rock cliff, 2.0 feet (0.6 m) west of the
approximate high water line, and 2.5 feet (0.8 m) above the surrounding beach
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 11/13/1989
Station ID: 8410875 SUPERCEDED DATE: 04/21/2003
Name: BIRCH ISLANDS, WHITING BAY
MAINE
NOAA Chart: 13328 Latitude: 44° 52.5' N
USGS Quad: PEMBROKE Longitude: 67° 9.5' W
T I D A L D A T U M S
Tidal datums at BIRCH ISLANDS, WHITING BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: OCTOBER 1985
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8410140 EASTPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/16/1985) = 20.88
MEAN HIGHER HIGH WATER MHHW = 18.30
MEAN HIGH WATER MHW = 17.71
MEAN TIDE LEVEL MTL = 9.02
MEAN LOW WATER MLW = 0.33
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/17/1985) = -1.72
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
0875 C 1985 21.38 3.67
0875 A 1985 17.40 -0.31
0875 B 1985 18.29 0.58
0875 D 1985 16.78 -0.93
0875 E 1985 18.95 1.24
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 11/13/1989
Station ID: 8410875 SUPERCEDED DATE: 04/21/2003
Name: BIRCH ISLANDS, WHITING BAY
MAINE
NOAA Chart: 13328 Latitude: 44° 52.5' N
USGS Quad: PEMBROKE Longitude: 67° 9.5' 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.