U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8413801 PUBLICATION DATE: 04/21/2003
Name: ELLSWORTH, UNION RIVER
MAINE
NOAA Chart: 13312 Latitude: 44° 32.2' N
USGS Quad: ELLSWORTH Longitude: 68° 25.4' W
To reach the bench marks from the intersection of U.S. Route 1A and U.S. Route
1/State Route 172 in Ellsworth, proceed west on Route 1/172 for 0.3 km (0.2 mi)
to State Route 230, then south on Route 230 for 0.6 km (0.4 mi) to the entrance
of the Ellsworth Public Boat Access on the right. The bench marks are located at
the boat access, and the tide gage is located on the north end of the
northernmost crib.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3801 A 1999
DESIGNATION: 841 3801 A
MONUMENTATION: Tidal Station disk VM#: 15909
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Flag foundation
The primary bench mark is a disk set in the concrete base of a flag pole in the
southern part of the parking area of the Public Boat Access, 32.65 m (107.1ft)
south of the ramp leading to the fuel pier, 13.17 m (43.2 ft) NNW of the NE
corner of the boat ramp, and 0.42 m (1.4 ft) east of the center of the flag
pole.
BENCH MARK STAMPING: 3801 B 1999
DESIGNATION: 841 3801 B
MONUMENTATION: Tidal Station disk VM#: 15910
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Gazebo foundation
The bench mark is a disk set in the foundation of an octagonol gazebo near the
parking area of the Public Boat Access, 53.72 m (176.2 ft) north of the north
curb of the parking area, 9.67 m (31.7 ft) NE of the west point of the gazebo,
and 0.60 m (2.0 ft) SSW of the NE point of the gazebo.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8413801 PUBLICATION DATE: 04/21/2003
Name: ELLSWORTH, UNION RIVER
MAINE
NOAA Chart: 13312 Latitude: 44° 32.2' N
USGS Quad: ELLSWORTH Longitude: 68° 25.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3801 C 1999
DESIGNATION: 841 3801 C
MONUMENTATION: Tidal Station disk VM#: 15913
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Foundation of building
The bench mark is a disk set in the building foundation at the rear of the
Ellsworth Water Treatment Plant, 18.56 m (60.9 ft) NE of the NE corner of the
red frame garage, 3.89 m (12.8 ft) NE of the SW corner of the sewage holding
tank, and 3.30 m (10.8 ft) NE of the SE side of the garage door of the treatment
plant rear entrance.
BENCH MARK STAMPING: 3801 D 1999
DESIGNATION: 841 3801 D
MONUMENTATION: Tidal Station disk VM#: 15914
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Loading dock
The bench mark is a disk set in a small loading dock at the front of the
Ellsworth Water Treatment Plant, 18.90 m (62.0 ft) ESE of the north corner of
the treatment plant, 2.25 m (7.4 ft) north of the brick retaining wall, and 0.66
m (2.2 ft) SE of the SE wall of the plant.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8413801 PUBLICATION DATE: 04/21/2003
Name: ELLSWORTH, UNION RIVER
MAINE
NOAA Chart: 13312 Latitude: 44° 32.2' N
USGS Quad: ELLSWORTH Longitude: 68° 25.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3801 E 1999
DESIGNATION: 841 3801 E
MONUMENTATION: Tidal Station disk VM#: 15916
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete retaining wall
The bench mark is a disk set in a concrete retaining wall on the property of the
Dead River Company, 14.33 m (47.0 ft) south of the NE corner of the concrete
spill tank, 11.63 m (38.2 ft) NW of the NW edge of the asphalt driveway of the
water treatment plant, and 2.34 m (7.7 ft) SSW of the SW wall of the Dead River
Company.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8413801 PUBLICATION DATE: 04/21/2003
Name: ELLSWORTH, UNION RIVER
MAINE
NOAA Chart: 13312 Latitude: 44° 32.2' N
USGS Quad: ELLSWORTH Longitude: 68° 25.4' W
T I D A L D A T U M S
Tidal datums at ELLSWORTH, UNION RIVER based on:
LENGTH OF SERIES: 3 Months
TIME PERIOD: July 1999 - September 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) = 3.471
MEAN HIGH WATER (MHW) = 3.343
MEAN SEA LEVEL (MSL) = 1.738
MEAN TIDE LEVEL (MTL) = 1.728
MEAN LOW WATER (MLW) = 0.114
MEAN LOWER LOW WATER (MLLW) = 0.000
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3801 A 1999 4.804 1.461
3801 B 1999 5.557 2.214
3801 C 1999 6.105 2.762
3801 D 1999 8.425 5.082
3801 E 1999 5.781 2.438
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8413801 PUBLICATION DATE: 04/21/2003
Name: ELLSWORTH, UNION RIVER
MAINE
NOAA Chart: 13312 Latitude: 44° 32.2' N
USGS Quad: ELLSWORTH Longitude: 68° 25.4' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.