U.S. DEPARTMENT OF COMMERCE
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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.