U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
To reach the tidal bench marks from the intersection of U.S. Route 1 and Main
Street in Biddeford, proceed east for 0.5 mile (0.8 km) to Water Street, then
east on Water Street for 0.2 mile (0.3 km) to Cleaves Street, then east on
Cleaves Street for 0.1 mile (0.2 km) to Rumery's Boat Yard. The bench marks are
in the boat yard, and along Clifford and Pool Streets. The tide gage and staff
were in the NW corner of the boat yard.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8828 A 1991
DESIGNATION: 841 8828 A
MONUMENTATION: Tidal Station disk VM#: 12013
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The primary bench mark is a disk set in the center of the south retaining wall
for the boat lift at Rumery's Boat Yard, 24.38 m (80.0 ft) ENE of the NE corner
of the red brick main building, 11.58 m (38.0 ft) west of the north corner of a
large grey corrugated metal building, 11.49 m (37.7 ft) SSW of the north corner
of the west retaining wall of the boat lift, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8828 B 1991
DESIGNATION: 841 8828 B
MONUMENTATION: Tidal Station disk VM#: 12014
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 on the south side of
Clifford Street, 17.71 m (58.1 ft) west of utility pole NET&T #7.7 on the south
side of the street, 14.69 m (48.2 ft) NNE of utility pole C&P Co #7.1 on the
north side of the street at the east side of the driveway to #31 Clifford
Street, and 7.83 m (25.7 ft) ESE of the SE corner of the house at #31 Clifford
Street.
BENCH MARK STAMPING: 8828 C 1991
DESIGNATION: 841 8828 C
MONUMENTATION: Tidal Station disk VM#: 12015
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in the concrete bridge abutment on the south side
of the Pool Street bridge over Westbrook Stream, 44.20 m (145.0 ft) NNW of
utility pole NET&E #463045 on the north side of the entrance to the Parkside By
The Falls development, 10.82 m (35.5 ft) WSW of the centerline of Pool Street,
4.30 m (14.1 ft) SSE of the north end of the abutment, and 1.74 m (5.7 ft) below
the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: M 98 1943
DESIGNATION: M 98
MONUMENTATION: Bench Mark disk VM#: 12016
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: OC0241
SETTING CLASSIFICATION: Granite wall OPUS PID:
LATITUDE: 43° 29.3' N ( 43.48830) LONGITUDE: 70° 26.9' W ( -70.44830)
The bench mark is a disk set in the top of the granite stone wall at the
entrance to 131 Pool Street, 20.18 m (66.2 ft) NW of AT&T power pole #21, 14.90
m (48.9 ft) north of the west stone pillar at the entrance to Clifford Park,
8.72 m (28.6 ft) east of AT&T power pole #22, 7.19 m (23.6 ft) north of the
centerline of Pool Street, and 0.24 m (0.8 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: W 18 1941 36
DESIGNATION: W 18 USGS RESET
MONUMENTATION: Survey disk VM#: 12017
AGENCY: Maine Highway Dept (MEHD) IDB PID#: OC0244
SETTING CLASSIFICATION: Granite wing wall OPUS PID:
LATITUDE: 43° 29.1' N ( 43.48500) LONGITUDE: 70° 26.4' W ( -70.44000)
The bench mark is a disk set in the granite wing wall on the north side of the
Pool Street bridge over Westbrook stream, 12.86 m (42.2 ft) SE of the west end
of a steel guard rail, 11.55 m (37.9 ft) east of the centerline of Pool Street,
0.43 m (1.4 ft) west of the east corner of the granite block, and 1 m (4 ft)
below the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
T I D A L D A T U M S
Tidal datums at BIDDEFORD, SACO 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 = 2.998
MEAN HIGH WATER MHW = 2.862
MEAN SEA LEVEL MSL = 1.518
MEAN TIDE LEVEL MTL = 1.482
MEAN LOW WATER MLW = 0.102
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8828 A 1991 4.071 1.209
8828 B 1991 26.567 23.705
8828 C 1991 11.060 8.198
M 98 1943 36.345 33.483
W 18 1941 36 12.186 9.324
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8418828 PUBLICATION DATE: 04/21/2003
Name: BIDDEFORD, SACO RIVER
ME
NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170)
USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670)
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.