U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 9445246 PUBLICATION DATE: 07/12/2004
Name: WHITNEY POINT
WA
NOAA Chart: 18445 Latitude: 47° 45.7' N ( 47.76170)
USGS Quad: TENINO SW Longitude: 122° 51.0' W (-122.85000)
To reach the tidal bench marks from the high school in Quilcene, proceed south
on U.S. Highway 101 for 13.44 km (8.35 mi) to a paved road leading to the
Washington Shellfish Laboratory at Whitney Point, then turn and proceed NE on
paved road for 3.9 km (2.4 mi) to the State Shellfish Laboratory Building. The
bench marks are located between the Laboratory Building and the helicopter pad,
The tide gage and staff were located on the east side of the pier, on the sixth
and fifth pilings, respectively, from shore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: B3 1969
DESIGNATION: 944 5246 TIDAL B 3
MONUMENTATION: Tidal Station disk VM#: 9039
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: SY1164
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 47° 45.7' N ( 47.76170) LONGITUDE: 122° 51.1' W (-122.85200)
The primary bench mark is a disk set flush in the western end of a concrete
sidewalk on the north side of the Shellfish Laboratory, along a wall just west
of the westernmost door.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 9445246 PUBLICATION DATE: 07/12/2004
Name: WHITNEY POINT
WA
NOAA Chart: 18445 Latitude: 47° 45.7' N ( 47.76170)
USGS Quad: TENINO SW Longitude: 122° 51.0' W (-122.85000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1969
DESIGNATION: 944 5246 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 9040
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: SY1162
SETTING CLASSIFICATION: Bulkhead OPUS PID:
LATITUDE: 47° 45.7' N ( 47.76170) LONGITUDE: 122° 51.1' W (-122.85200)
The bench mark is a disk set flush in the top of a bulkhead at the NW corner of
the Washington State Shellfish Laboratory building.
BENCH MARK STAMPING: NO 2 1969
MONUMENTATION: Tidal Station disk VM#: 9041
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: SY1163
SETTING CLASSIFICATION: In a rock OPUS PID:
LATITUDE: 47° 45.7' N ( 47.76170) LONGITUDE: 122° 51.1' W (-122.85200)
The bench mark is a disk located in a large rock that is submerged at times and
which forms part of a bulkhead at the north end of a pipe for salt water flowing
between ponds, 91 m (300 ft) west of a floating pier and 91 m (300 ft) NW of the
NW corner of the Washington State Shellfish Laboratory. NOTE: The bench mark's
stamping is barely discernable.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 9445246 PUBLICATION DATE: 07/12/2004
Name: WHITNEY POINT
WA
NOAA Chart: 18445 Latitude: 47° 45.7' N ( 47.76170)
USGS Quad: TENINO SW Longitude: 122° 51.0' W (-122.85000)
T I D A L D A T U M S
Tidal datums at WHITNEY POINT based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: February 1978 - February 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.523
MEAN HIGH WATER MHW = 3.229
MEAN TIDE LEVEL MTL = 2.072
MEAN SEA LEVEL MSL = 2.067
MEAN LOW WATER MLW = 0.916
North American Vertical Datum NAVD88 = 0.814
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
B3 1969 5.213 1.984
NO 1 1969 6.023 2.794
NO 2 1969 3.157 -0.072
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 9445246 PUBLICATION DATE: 07/12/2004
Name: WHITNEY POINT
WA
NOAA Chart: 18445 Latitude: 47° 45.7' N ( 47.76170)
USGS Quad: TENINO SW Longitude: 122° 51.0' W (-122.85000)
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.