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National Ocean Service
Datums Page Page 1 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
To reach the bench marks from the intersection of Route 1 and 1A in Milbridge,
proceed north on Route 1A for 0.6 km (0.4 mi) to Bay View Road, then continue
east on Bay View Road for 0.5 km (0.3 mi) to the Public Boat Access. The bench
marks are located at the boat access, along Bay View Road, and along Route 1A.
The tide gage was located on the town dock at the public boat access.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: A 148 1962
DESIGNATION: A 148
MONUMENTATION: Bench Mark disk VM#: 15903
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: PD0347
SETTING CLASSIFICATION: Concrete wing wall OPUS PID:
LATITUDE: 44° 32.5' N ( 44.54170) LONGITUDE: 67° 52.9' W ( -67.88170)
The primary bench mark is a disk set in the NW concrete wingwall of the most
southerly of two U.S. Highway 1A bridges over the Narraguagus River, 0.3 km (0.2
m) NE of the junction of U.S. Highways 1 and 1A, 4 m (13 ft) NW of the highway
centerline, and 0.3 m (1 ft) above the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2581 A 1999
DESIGNATION: 841 2581 A
MONUMENTATION: Tidal Station disk VM#: 15904
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Flagpole base OPUS PID:
LATITUDE: 44° 32.6' N ( 44.54330) LONGITUDE: 67° 52.6' W ( -67.87670)
The bench mark is a disk set in the concrete flag pole base at the public boat
access, 56 m (184 ft) SSE of the entrance to the public pier, 28.50 m (93.5 ft)
SW of the SE corner of the dirt parking area, and 0.30 m (1.0 ft) NW of the
center of the flag pole.
BENCH MARK STAMPING: 2581 B 1999
DESIGNATION: 841 2581 B
MONUMENTATION: Tidal Station disk VM#: 15905
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete wing wall OPUS PID:
LATITUDE: 44° 32.6' N ( 44.54330) LONGITUDE: 67° 52.9' W ( -67.88170)
The bench mark is a disk set in the wing wall of the north corner of the most
northerly of two U.S. Highway 1A bridges over the Narraguagus River, 4.23 m
(13.9 ft) ENE of the highway centerline, 3.33 m (10.9 ft) NNW of the ESE end of
the wing wall, and 2.91 m (9.6 ft) ESE of the WNW end of the bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2581 C 1999
DESIGNATION: 841 2581 C
MONUMENTATION: Tidal Station disk VM#: 15906
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 44° 32.6' N ( 44.54330) LONGITUDE: 67° 53.0' W ( -67.88330)
The bench mark is a disk set in the foundation of a gasoline pump island at the
abandoned Ospray Corner Gift Shop, 15.69 m (51.5 ft) ENE of the centerline of
U.S. Highway 1A, 13.72 m (45.0 ft) NW of the NW corner of the abandoned gift
shop, and 0.45 m (1.5 ft) south of the north end of the old gasoline pump
island.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B 148 1962
DESIGNATION: B 148
MONUMENTATION: Bench Mark disk VM#: 15907
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: PD0346
SETTING CLASSIFICATION: Concrete face of building OPUS PID:
LATITUDE: 44° 33.1' N ( 44.55170) LONGITUDE: 67° 53.1' W ( -67.88500)
The bench mark is a disk set vertically in the NW concrete face of a telephone
company building at Milbridge, 1.9 km (1.2 mi) NE along U.S. Highway 1A from the
post office in Milbridge, 15 m (49 ft) SE of the centerline of U.S. Highway 1A,
0.3 m (1ft) SW of the north corner of the building, and 0.3 m (1ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
T I D A L D A T U M S
Tidal datums at MILBRIDGE, NARRAGUAGUS RIVER based on:
LENGTH OF SERIES: 2 Months
TIME PERIOD: July 1999 - August 1999
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8413320 BAR HARBOR, FRENCHMAN BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.694
MEAN HIGH WATER MHW = 3.562
North American Vertical Datum NAVD88 = 1.906
MEAN SEA LEVEL MSL = 1.852
MEAN TIDE LEVEL MTL = 1.838
MEAN LOW WATER MLW = 0.114
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
A 148 1962 6.256 2.694
2581 A 1999 4.995 1.433
2581 B 1999 6.111 2.549
2581 C 1999 5.564 2.002
B 148 1962 16.680 13.118
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8412581 PUBLICATION DATE: 04/21/2003
Name: MILBRIDGE, NARRAGUAGUS RIVER
ME
NOAA Chart: 13324 Latitude: 44° 32.4' N ( 44.54000)
USGS Quad: CHERRYFIELD Longitude: 67° 52.5' W ( -67.87500)
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.