U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 11/30/1990
Station ID: 9441187 SUPERCEDED DATE: 04/21/2003
Name: ABERDEEN, GRAYS HARBOR
WASHINGTON
NOAA Chart: 18502 Latitude: 46° 58.1' N
USGS Quad: ABERDEEN Longitude: 123° 51.2' W
To reach the tidal bench marks from U.S. Highway 101 in the town of Aberdeen,
proceed south on U.S. Highway 101 (following signs to Port of Grays Harbor) to
Industrial Road, then go NW on Industrial Road for 1.5 miles (2.4 km) to
Terminal 1 on the SW side of Industrial Road. The bench marks are along
Industrial Road and at the Bay City Fuel Company Union 76 Storage Plant, 640
Myrtle Street. The tide gage and staff were across from the Corps of Engineers
floating pier on the south side of Slip No. 1.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2 1927
MONUMENTATION: Survey Disk VM#: 8992
AGENCY: PID#: SC0794
SETTING CLASSIFICATION: Concrete Block
The bench mark is set in the top of a 10 foot (3 m) octagonal concrete block
covered with dirt and rock at the NE corner of the junction of Industrial Road
and Myrtle Street, 51 feet (16 m) SW of SW corner of the concrete base of a
large cylindrical propane tank, 37 feet (11 m) NE of the centerline of
Industrial Road, 30 feet (9 m) east of the centerline of Myrtle Street, 7 feet
(2 m) north of a witness post, and 0.5 foot (0.2 m) below ground level.
BENCH MARK STAMPING: 5 1934
MONUMENTATION: Survey Disk VM#: 8993
AGENCY: PID#: SC0793
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set in the top of a concrete wall and accessible by removing a
3 inch square wooden plug set in top of the platform at the head of the stairs
in the south corner of a concrete wall surrounding the Union Oil Company storage
tank farm, 300 feet (91 m) NW of the intersection of Industrial Road and West
First Street, 107 feet (33 m) NE of the centerline of Industrial Road, 70 feet
(21 m) SW of the SE corner of the Union Oil Company boiler house, 4.5 feet (1.4
m) above ground level, and covered by the fourth plank north of the southern
edge of the wooden loading platform.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 11/30/1990
Station ID: 9441187 SUPERCEDED DATE: 04/21/2003
Name: ABERDEEN, GRAYS HARBOR
WASHINGTON
NOAA Chart: 18502 Latitude: 46° 58.1' N
USGS Quad: ABERDEEN Longitude: 123° 51.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3 1939
MONUMENTATION: Survey Disk VM#: 8994
AGENCY: PID#: SC0795
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set in the SW corner of the concrete pad for the westernmost
one of a group of six cylindrical oil tanks at Bay City Fuel Company, Union 76
Storage Plant, 290 feet (88 m) NW of the Myrtle Street/Northern Pacific Railway
intersection, 240 feet (73 m) west of the centerline of Myrtle Street, 48 feet
(15 m) north of the chain link fence on the plants south boundary, and 35 feet
(11 m) east of chain link fence on plants west boundary.
BENCH MARK STAMPING: 1187 A 1982
MONUMENTATION: Survey Disk VM#: 8995
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set flush in top of the SE corner of a retaining wall around
the oil tanks at Bay City Fuel Company, Union 76 Storage Plant 145.5 feet (44.3
m) east of chain link fence on plants west boundary, 129.5 feet (39.5 m) west of
centerline of Myrtle Street, 39.5 feet (12.0 m) north of a chain link fence on
plants south boundary, 3.5 feet (1.1 m) west of the northernmost of two SW
corners, and about 4 feet (1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 11/30/1990
Station ID: 9441187 SUPERCEDED DATE: 04/21/2003
Name: ABERDEEN, GRAYS HARBOR
WASHINGTON
NOAA Chart: 18502 Latitude: 46° 58.1' N
USGS Quad: ABERDEEN Longitude: 123° 51.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1187 B 1982
MONUMENTATION: Survey Disk VM#: 8996
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set in the SW corner of the concrete pad for the most SE oil
tank at Bay City Fuel Company, Union 76 Storage Plant, 198 feet (60 m) west of
the centerline of Myrtle Street, 77 feet (23 m) east of the chain link fence on
the plants boundary, 34 feet (10 m) north of the chain link fence on the plants
south boundary, and 25 feet (8 m) west of the south concrete retaining wall, 1.0
foot (0.3 m) north of the south edge of the pad and 1.0 foot (0.3 m) east of the
west edge of the pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 11/30/1990
Station ID: 9441187 SUPERCEDED DATE: 04/21/2003
Name: ABERDEEN, GRAYS HARBOR
WASHINGTON
NOAA Chart: 18502 Latitude: 46° 58.1' N
USGS Quad: ABERDEEN Longitude: 123° 51.2' W
T I D A L D A T U M S
Tidal datums at ABERDEEN, GRAYS HARBOR based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: JUNE 1982-MAY 1983
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9440910 TOKE POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (12/03/1982) = 13.83
MEAN HIGHER HIGH WATER MHHW = 10.07
MEAN HIGH WATER MHW = 9.37
MEAN TIDE LEVEL MTL = 5.40
MEAN LOW WATER MLW = 1.42
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (07/22/1982) = -3.38
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
2 1927 15.34 5.97
5 1934 19.77 10.40
3 1939 16.02 6.65
1187 A 1982 18.71 9.34
1187 B 1982 16.02 6.65
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 11/30/1990
Station ID: 9441187 SUPERCEDED DATE: 04/21/2003
Name: ABERDEEN, GRAYS HARBOR
WASHINGTON
NOAA Chart: 18502 Latitude: 46° 58.1' N
USGS Quad: ABERDEEN Longitude: 123° 51.2' 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 (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 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.