U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
To reach the tidal bench marks from the intersection of U.S. Route 1 and State
Route 9A in Kennebunk, proceed east on route 9A for 5.6 Km (3.5 mi) to State
Route 9, turn left and continue east on Route 9 for 0.5 Km (0.3 mi) to Ocean
Avenue, then turn right and continue on Ocean Avenue for 0.3 Km (0.2 mi) to #7
Wharf Lane. The bench marks are located along Wharf Lane, Ocean Avenue, and
Route 9. The tide gage and staff were located on the private pier at #7 Wharf
Lane.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8911 A 1991
DESIGNATION: 841 8911 A
MONUMENTATION: Tidal Station disk VM#: 12018
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite sea wall OPUS PID#: BBDL99
LATITUDE: ' ° (0) LONGITUDE: ' ° (0)
The primary bench mark is a disk set in a granite sea wall just inside the
property line at the beginning of the sea wall at the private residence at #7
Wharf Lane on the east bank of the Kennebunk River, 27.27 m (89.5 ft) west of
power pole # 87, 9 m (30 ft) SW of the SW corner (main frame) of the house, and
4 m (12 ft) east of the SW corner of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8911 B 1991
DESIGNATION: 841 8911 B
MONUMENTATION: Tidal Station disk VM#: 12019
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sewer cap OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in a 2 m (6 ft) diameter concrete sewer cap on the
west side of Ocean Avenue at the intersection of Ocean Avenue and Green Street,
just south of the Arundel Yacht Club, 20 m (67 ft) SSW of power pole #J13
located at the NE corner of the intersection of Ocean Avenue and Green Street,
14 m (46 ft) west of a fire hydrant on the east side of Ocean Avenue in front of
Old River House Gallery, 8.32 m (27.3 ft) west of the Ocean Avenue centerline,
and 4.54 m (14.9 ft) south of the SE corner of the fence post in front of the
Arundel Yacht Club.
BENCH MARK STAMPING: 8911 C 1991
DESIGNATION: 841 8911 C
MONUMENTATION: Tidal Station disk VM#: 12020
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in a bedrock outcropping adjacent to a small
cemetery on the south side of Route 9, SE of an electrical substation,
approximately 0.6 km (0.4 mi) east along Route 9 from its intersection with
Maine Street, 14 m (47 ft) SE of power pole #1 on the north side of Route 9,
8.14 m (26.7 ft) ENE of the NE corner of Captain Harrison Murphy's headstone, 5
m (18 ft) south of the Route 9 centerline, 1.62 m (5.3 ft) north of the SE
corner of an iron fence around the cemetery, and 1 m (4 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8911 D 1991
DESIGNATION: 841 8911 D
MONUMENTATION: Tidal Station disk VM#: 12021
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in the SE concrete abutment of the Route 9 draw
bridge over the Kennebunk River in Kennebunkport, 18 m (59 ft) west of the first
light post east of the river on the south side of Route 9, 4.08 m (13.4 ft) SW
of the SW corner of the draw bridge signal gate box, and 1.98 m (6.5 ft) south
of a sign post located on the SE corner of the bridge along the walkway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: X 98 RESET 1977
DESIGNATION: X 98 RESET 1977
MONUMENTATION: Bench Mark disk VM#: 12022
AGENCY: Maine Department of Transportation
(MEDT) IDB PID#: OC1316
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 43° 21.8' N ( 43.36330) LONGITUDE: 70° 27.9' W ( -70.46500)
The bench mark is a disk set in a bedrock outcropping on the NW side of the "T"
intersection of Route 9 and Laurel Road, approximately 0.8 km (0.5 mi) east
along Route 9 from its intersection with Maine Street, north of house #685 on
Route 9, 46 m (151 ft) west of power pole # 26 on the north side of Route 9, 9 m
(30 ft) north of the centerline of Route 9, 2 m (5 ft) north of power pole
25-10-25, 2 m (8 ft) north of the curb, and 1 m (3 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
T I D A L D A T U M S
Tidal datums at KENNEBUNKPORT, KENNEBUNK RIVER based on:
LENGTH OF SERIES: 3 Months
TIME PERIOD: July 1991 - September 1991
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 = 2.927
MEAN HIGH WATER MHW = 2.797
MEAN SEA LEVEL MSL = 1.465
MEAN TIDE LEVEL MTL = 1.450
MEAN LOW WATER MLW = 0.104
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8911 A 1991 4.134 1.337
8911 B 1991 4.438 1.641
8911 C 1991 15.632 12.835
8911 D 1991 4.915 2.118
X 98 RESET 1977 20.823 18.026
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8418911 PUBLICATION DATE: 04/21/2003
Name: KENNEBUNKPORT, KENNEBUNK RIVER
ME
NOAA Chart: 13286 Latitude: 43° 21.5' N ( 43.35830)
USGS Quad: KENNEBUNKPORT Longitude: 70° 28.6' W ( -70.47670)
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.