Published Bench Mark Sheet for 9445246 WHITNEY POINT, DABOB BAY, HOOD CANAL WASHINGTON
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 04/18/1984
Station ID: 9445246 SUPERCEDED DATE: 04/21/2003
Name: WHITNEY POINT, DABOB BAY, HOOD CANAL
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 45.7' N
USGS Quad: TENINO SW Longitude: 122° 51.0' W
To reach the tidal bench marks from the high school in Quilcene, proceed south
on U.S. Highway 101 for 8.35 miles (13.44 km) to a paved road leading to the
Washington Shellfish Laboratory at Whitney Point, then NE on paved road for 2.4
miles (3.9 km) to the State Shellfish Laboratory Building. The bench marks are
located between the Laboratory Building and the helicopter pad and 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
MONUMENTATION: Survey Disk VM#: 9039
AGENCY: PID#: SY1164
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is 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.
BENCH MARK STAMPING: NO 1 1969
MONUMENTATION: Survey Disk VM#: 9040
AGENCY: PID#: SY1162
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in the top of a bulkhead at the NW corner of the
Washington State Shellfish Laboratory building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 04/18/1984
Station ID: 9445246 SUPERCEDED DATE: 04/21/2003
Name: WHITNEY POINT, DABOB BAY, HOOD CANAL
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 45.7' N
USGS Quad: TENINO SW Longitude: 122° 51.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1969
MONUMENTATION: Survey Disk VM#: 9041
AGENCY: PID#: SY1163
SETTING CLASSIFICATION: Rock
The bench mark is located in a large rock which forms part of a bulkhead at the
north end of a pipe for salt water flowing between ponds, 300 feet (91 m) west
of a floating pier and 300 feet (91 m) NW of the NW corner of the Washington
State Shellfish Laboratory. The bench mark is set in rock that is submerged at
times and the stamping is barely discernable.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 04/18/1984
Station ID: 9445246 SUPERCEDED DATE: 04/21/2003
Name: WHITNEY POINT, DABOB BAY, HOOD CANAL
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 45.7' N
USGS Quad: TENINO SW Longitude: 122° 51.0' W
T I D A L D A T U M S
Tidal datums at WHITNEY POINT, DABOB BAY, HOOD CANAL based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: FEBRUARY 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9447130 SEATTLE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/09/1978) = 14.66
MEAN HIGHER HIGH WATER (MHHW) = 11.55
MEAN HIGH WATER (MHW) = 10.59
MEAN TIDE LEVEL (MTL) = 6.80
MEAN LOW WATER (MLW) = 3.00
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (01/23/1978) = -1.01
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
B3 1969 17.28 6.69
NO 1 1969 19.94 9.35
NO 2 1969 10.54 -0.05
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 04/18/1984
Station ID: 9445246 SUPERCEDED DATE: 04/21/2003
Name: WHITNEY POINT, DABOB BAY, HOOD CANAL
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 45.7' N
USGS Quad: TENINO SW Longitude: 122° 51.0' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.
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