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Datums Page Page 1 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
To reach the tidal bench marks from Seattle, take I-5 north and continue 24 km
(15 mi) north of Bellingham to exit 266 Custer/Grandview Road and turn left at
the top of the exit onto Grandview Road, then continue on Grandview Road for 11
km (7 mi), past the BP Cherry Point Refinery and turn left onto Jackson Road.
Continue 2.4 km (1.5 mi) on Jackson Road to the Guard House and gate, pass
through the gate for 0.5 km (0.3 mi) down the hill to the foot of the pier. The
bench marks are located in the vicinity of the pier. The tide gauge is located
0.5 km (0.3 mi) down the pier on the right.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 1 1971
DESIGNATION: 944 9424 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 1706
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Abutment OPUS PID:
LATITUDE: 48° 52.0' N ( 48.86617) LONGITUDE: 122° 45.1' W (-122.75214)
The primary bench mark is a disk set in the top of the north abutment at inshore
end of the Cherry Point refinery pier, 25.4 m (83.3 ft) NE of the gate leading
to the pier, 2.13 m (7.0 ft) NW of the centerline of the pier, 0.3 m (1 ft) SW
of a steel gate post, and 0.3 m (1 ft) higher than the deck of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 4 1971
DESIGNATION: 944 9424 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 1709
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 48° 52.2' N ( 48.86964) LONGITUDE: 122° 44.9' W (-122.74886)
The bench mark is a disk set in the top of a 9-inch square concrete monument
about 366 m (1,200 ft) inshore of the Cherry Point refinery Pier, 28 m (92 ft)
north of the south end of Jackson Road, 6.40 m (21.0 ft) east of the centerline
of the road, 0.76 m (2.5 ft) north of a steel witness post, 0.15 m (0.5 ft) west
of a woven wire fence, and projecting 0.10 m (0.3 ft) above the ground and along
the road leading to the oil pier.
BENCH MARK STAMPING: BM 5 1971 ARCO
DESIGNATION: 944 9424 BM 5 ARCO
MONUMENTATION: Bench Mark disk VM#: 1710
AGENCY: Atlantic Richfield Oil Company IDB PID#:
SETTING CLASSIFICATION: Concrete pier deck OPUS PID:
LATITUDE: 48° 52.0' N ( 48.86669) LONGITUDE: 122° 45.1' W (-122.75200)
The bench mark is a disk set on the centerline of the pier in the concrete deck
of the pier, at the inshore end of the ARCO Oil Pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 6 1971 ARCO
DESIGNATION: 944 9424 BM 6 ARCO
MONUMENTATION: Bench Mark disk VM#: 1711
AGENCY: Atlantic Richfield Oil Company IDB PID#:
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 48° 52.1' N ( 48.86831) LONGITUDE: 122° 45.0' W (-122.75000)
The bench mark is a disk set in a 2-inch iron pipe, located 265 m (870 ft)
inshore (NE) end of the ARCO Oil Pier, on the centerline of the road leading to
the pier, 0.15 m (0.5 ft) below surface of road under an iron inspection cover.
BENCH MARK STAMPING: 9424 H 1977
DESIGNATION: 944 9424 H
MONUMENTATION: Tidal Station disk VM#: 1713
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 48° 52.2' N ( 48.87047) LONGITUDE: 122° 44.9' W (-122.74875)
The bench mark is a disk located 101 m (330 ft) north of bench mark TIDAL 4
1971, 13.41 m (44.0 ft) west of the BP Cherry Point pipeline at Lonseth Road,
8.23 m (27.0 ft) ESE of the intersection of Lonseth Road and Jackson Road, 1.52
m (5.0 ft) NE of telephone pole F19A4, 0.61 m (2.0 ft) south of a metal witness
post, and 0.50 m (1.5 ft) east of the fence running parallel to Jackson Road.
The bench mark is set 6 cm ( 0.2 ft) below ground level, crimped to the top of a
5/8-inch copper-clad steel rod driven to a depth of 10.4 m (34 ft), and encased
in a 4-inch PVC pipe with cover which extends 0.09 m (0.3 ft) above the disk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9424 J 1977
DESIGNATION: 944 9424 J TIDAL
MONUMENTATION: Tidal Station disk VM#: 1714
AGENCY: National Ocean Survey (NOS) IDB PID#: AI2204
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AI2204
LATITUDE: 48° 52.1' N ( 48.86867) LONGITUDE: 122° 45.0' W (-122.74917)
The bench mark is a disk located near the Cherry Point refinery Jackson Road
entrance, 82 m (270 ft) SW of the guard house and gate on Jackson Road, 32 m
(105 ft) SW from telephone pole 70DFP 345, 8.53 m (28.0 ft) NW of the centerline
of Jackson Road, 2 m (6 ft) NW of a large boulder at the corner of a triangular
patch of grass. The bench mark is set 3 cm (0.1 ft) below ground level under
an NOS aluminum cover plate set in concrete, crimped to the top of a 5/8-inch
copper-clad steel rod driven to a depth of 12.5 m (41 ft).
BENCH MARK STAMPING: 9424 L 1986
DESIGNATION: 944 9424 L
MONUMENTATION: Tidal Station disk VM#: 1715
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 48° 52.0' N ( 48.86669) LONGITUDE: 122° 45.1' W (-122.75200)
The bench mark is a disk located 480 m (1,575 ft) east of the tide house, 15.85
m (52.0 ft) NE of the foot of the ARCO pier, 0.76 m (2.5 ft) west of a metal
witness post, and 0.50 m (1.5 ft) west of the NW corner of a chain link fence at
the foot of the pier. The bench mark is set 3 cm (0.1 ft) below ground level
under an NOS aluminum cover plate set in concrete, crimped to the top of a
copper-clad steel rod driven to a depth of 4.9 m (16 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9424 M 1992
DESIGNATION: 944 9424 M
MONUMENTATION: Tidal Station disk VM#: 12571
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 52.0' N ( 48.86669) LONGITUDE: 122° 45.0' W (-122.75000)
The bench mark is a disk set flush on the SE side of a 0.76 m (2.5 ft) diameter
concrete foundation that supports the pipeline, about 183 (600 ft) inshore of
the NE end of pier, 32 m (105 ft) inshore from an 2 m (8 ft) high dome-covered
station in the middle of the pipeline, 6.40 m (21.0 ft) SE of the centerline of
pier access road, 0.09 m (0.25 ft) NW of the largest pipe, and 0.24 m (0.8 ft)
below supporting girder.
BENCH MARK STAMPING: 9424 N 1992
DESIGNATION: 944 9424 N
MONUMENTATION: Tidal Station disk VM#: 12572
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 52.0' N ( 48.86669) LONGITUDE: 122° 45.1' W (-122.75200)
The bench mark is a disk set flush on the SE side of a 0.76 m (2.5 ft) diameter
concrete foundation that supports the pipeline, about 91 m (300 ft) inshore of
the NE end of the pier, 50.29 m (165.0 ft) NE of a double-horizontal bend in the
pipeline, 7.62 m (25.0 ft) SE of the centerline of the road to the pier, 0.09 m
(0.25 ft) NW of the largest pier, and about 0.15 m (0.5 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9424 P 1992
DESIGNATION: 944 9424 P
MONUMENTATION: Tidal Station disk VM#: 12573
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 52.1' N ( 48.86789) LONGITUDE: 122° 45.0' W (-122.74992)
The bench mark is a disk set flush in the top of a 0.76 m (2.5 ft) diameter
concrete foundation supporting the pipeline, about 274 m (900 ft) inshore of the
NE end of the pier, 8.53 m (28.0 ft) SE of the centerline of the road to the
pier, 5.33 m (17.5 ft) NE of a vertical bend in the pipeline, 0.09 m (0.25 ft)
NW of the largest pipe, and 0.15 m (0.5 ft) above ground.
BENCH MARK STAMPING: 9424 R 1995
DESIGNATION: 944 9424 R
MONUMENTATION: Tidal Station disk VM#: 12597
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 48° 51.8' N ( 48.86347) LONGITUDE: 122° 45.4' W (-122.75714)
The bench mark is a disk set in the top of the curb on the north side of the
Cherry Point Refinery Pier, located 128 m (422 ft) NE of the tide house, 0.21 m
(0.7 ft) west of the east guard rail upright, 0.15 m (0.5 ft) north of the south
edge of the curb, and 0.30 m (1.0 ft) above pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
T I D A L D A T U M S
Tidal datums at CHERRY POINT, STRAIT OF GEORGIA based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/16/1982) = 3.913
MEAN HIGHER HIGH WATER MHHW = 2.788
MEAN HIGH WATER MHW = 2.535
MEAN TIDE LEVEL MTL = 1.666
MEAN SEA LEVEL MSL = 1.610
MEAN LOW WATER MLW = 0.796
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/13/1985) = -1.299
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 1 1971 9.293 6.758
TIDAL 4 1971 34.835 32.300
BM 5 1971 ARCO 9.036 6.501
BM 6 1971 ARCO 32.291 29.756
9424 H 1977 34.436 31.901
9424 J 1977 34.393 31.858
9424 L 1986 9.115 6.580
9424 M 1992 23.347 20.812
9424 N 1992 16.039 13.504
9424 P 1992 32.921 30.386
9424 R 1995 7.908 5.373
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9449424 PUBLICATION DATE: 10/06/2011
Name: CHERRY POINT, STRAIT OF GEORGIA
WA
NOAA Chart: 18431 Latitude: 48° 51.8' N ( 48.86330)
USGS Quad: LUMNI BAY Longitude: 122° 45.5' W (-122.75800)
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.