U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8417134 PUBLICATION DATE: 02/27/2006
Name: GARDINER, KENNEBEC RIVER
ME
NOAA Chart: 13298 Latitude: 44° 14.0' N ( 44.23330)
USGS Quad: GARDINER Longitude: 69° 46.0' W ( -69.76670)
FROM I-295, CONTINUE NORTH ON I-295 TO EXIT 49 STATE ROUTE 201 RICHMOND,
PROCEED NORTH OF STATE ROUTE 201 FOR 9.0 KM (5.6 MI) TO THE INTERSECTION OF
STATE ROUTE 201 AND MARINA WAY, TURN RIGHT AND CONTINUE PAST THE CENTRAL MAINE
ELECTRIC COMPANY DOWN THE PRIVATE ROAD TO THE MARINA. THE BENCH MARKS ARE
LOCATED AT THE ELECTRIC COMPANY, ALONG THE WALK PATH, AND IN THE FIRE STATION
WINGWALL. THE TIDE GAGE IS LOCATED ON THE FOGGY BOTTOM MARINA BULKHEAD.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7134 A 2005
DESIGNATION: 841 7134 A
MONUMENTATION: Tidal Station disk VM#: 17899
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite foundation OPUS PID:
LATITUDE: 44° 14.6' N ( 44.24330) LONGITUDE: 69° 46.1' W ( -69.76830)
The bench mark is a disk set in the granite foundation of the Maine Central
Power Company located on Water Street, 44.34 m (145.5 ft) SE of the east
railroad track, 15.9 m (52.2 ft) east of the fire hydrant, 1.84 m (6.04 ft) NE
of the power company door, and 0.03 m (0.1 ft) above the stoop.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8417134 PUBLICATION DATE: 02/27/2006
Name: GARDINER, KENNEBEC RIVER
ME
NOAA Chart: 13298 Latitude: 44° 14.0' N ( 44.23330)
USGS Quad: GARDINER Longitude: 69° 46.0' W ( -69.76670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7134 B 2005
DESIGNATION: 841 7134 B
MONUMENTATION: Tidal Station disk VM#: 17900
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 44° 14.5' N ( 44.24170) LONGITUDE: 69° 46.2' W ( -69.77000)
The bench mark is a disk set in a culvert located along the walk/bike path,
33.63 m (110.3 ft) south of the "5.75" mile marker, 26.00 m (85.3 ft) north of
the SW corner of the home at 305 Maine Avenue, and 7.63 m (25.0 ft) west of the
west railroad track.
BENCH MARK STAMPING: 7134 C 2005
DESIGNATION: 841 7134 C
MONUMENTATION: Tidal Station disk VM#: 17901
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete culvert OPUS PID:
LATITUDE: 44° 14.5' N ( 44.24170) LONGITUDE: 69° 46.2' W ( -69.77000)
The bench mark is a disk set in a retaining wall located east of the Farmdale
Fire Station, 10.98 m (36.0 ft) north of the NW corner of the building at 285
Maine Avenue, and 5.85 m (19.2 ft) SE of the centerline of the garage driveway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8417134 PUBLICATION DATE: 02/27/2006
Name: GARDINER, KENNEBEC RIVER
ME
NOAA Chart: 13298 Latitude: 44° 14.0' N ( 44.23330)
USGS Quad: GARDINER Longitude: 69° 46.0' W ( -69.76670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7134 D 2005
DESIGNATION: 841 7134 D
MONUMENTATION: Tidal Station disk VM#: 17902
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 44° 14.7' N ( 44.24500) LONGITUDE: 69° 46.2' W ( -69.77000)
The bench mark is a disk set in a concrete air conditioning unit foundation
located along the east wall of the Home Care for Maine building at 357 Maine
Avenue, 27.50 m (90.2 ft) north of the NE corner of the building, 7.80 m (25.6
ft) west of the fenceline, and 4.79 m (15.7 ft) south of the NE corner of the
concrete pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8417134 PUBLICATION DATE: 02/27/2006
Name: GARDINER, KENNEBEC RIVER
ME
NOAA Chart: 13298 Latitude: 44° 14.0' N ( 44.23330)
USGS Quad: GARDINER Longitude: 69° 46.0' W ( -69.76670)
T I D A L D A T U M S
Tidal datums at GARDINER, KENNEBEC RIVER based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: September 2005
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8418150 PORTLAND, CASCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.990
MEAN HIGH WATER MHW = 1.882
MEAN SEA LEVEL MSL = 1.025
MEAN TIDE LEVEL MTL = 0.974
MEAN LOW WATER MLW = 0.066
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7134 A 2005 8.381 6.499
7134 B 2005 4.682 2.800
7134 C 2005 9.487 7.605
7134 D 2005 8.435 6.553
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8417134 PUBLICATION DATE: 02/27/2006
Name: GARDINER, KENNEBEC RIVER
ME
NOAA Chart: 13298 Latitude: 44° 14.0' N ( 44.23330)
USGS Quad: GARDINER Longitude: 69° 46.0' W ( -69.76670)
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.