U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9444122 PUBLICATION DATE: 02/05/2004
Name: EDIZ HOOK
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 8.4' N
USGS Quad: EDIZ HOOK Longitude: 123° 24.8' W
To reach the tidal bench marks from the intersection of Turnwater Street and
Marine Drive in Port Angeles, proceed NW on Marine Drive for about 2.1 km (1.3
mi) to Ediz Hook, then veer right and proceed east on Marine Drive (Ediz Hook
Road) for 4.3 km (2.7 mi) to the U.S. Coast Guard Air Station. The bench marks
are at the east end of the landing strip, on a hanger, and on the Administration
building. The tide station was on the Coast Guard pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6 1944
DESIGNATION: 944 4122 TIDAL 6
MONUMENTATION: Bench Mark disk VM#: 9025
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: TR0779
SETTING CLASSIFICATION: Concrete search light platform
The primary bench mark is a disk set in the top of the SE corner of the southern
search light platform at the east end of the landing strip, 63 m (206 ft) ESE of
the SE corner of the landing strip, 9.94 m (32.6 ft) NE of bench mark East Base,
1.46 m (4.8 ft) SE of the SE side of the flood light base, and 1.68 m (5.5 ft)
above the ground.
BENCH MARK STAMPING: TUCKER NO 1 1892
DESIGNATION: TUCKER RM 1
ALIAS: NO. 8
MONUMENTATION: Reference Mark disk VM#: 9023
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: TR0783
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in the top of a round concrete monument near a
fog/beacon building at the end of Ediz Hook, 122 m (401 ft) SE of bench mark
East Base, 38 m (124 ft) east of the centerline of the road, 17 m (57 ft) NE of
the NW one of three antenna poles, and 7.77 m (25.5 ft) north of an anchor for a
guy wire.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9444122 PUBLICATION DATE: 02/05/2004
Name: EDIZ HOOK
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 8.4' N
USGS Quad: EDIZ HOOK Longitude: 123° 24.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TUCKER NO 2 1892
DESIGNATION: TUCKER RM 2
ALIAS: NO. 9
MONUMENTATION: Reference Mark disk VM#: 9024
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: TR0782
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in the top of a round concrete monument near the
fog/beacon building at the end Ediz Hook, 122 m (401 ft) SE of bench mark East
Base, 27 m (89 ft) east of the centerline of the road, 21 m (70 ft) north of the
NW one of three antenna poles, and 12.01 m (39.4 ft) WNW of bench mark TUCKER RM
1.
BENCH MARK STAMPING: D 471 1974
DESIGNATION: D 471
MONUMENTATION: Vertical Control disk VM#: 9026
AGENCY: National Geodetic Survey (NGS) PID#: TR0784
SETTING CLASSIFICATION: Concrete foundation
The bench mark is a disk set vertically in the concrete foundation for the NW
wall of a hangar, 81 m (265 ft) east of the Administration building, 5.36 m
(17.6 ft) NW of the NW edge of the SW entrance door to the hangar, 0.15 m (0.5
ft) NE of the west corner of the hangar, and 0.46 m (1.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9444122 PUBLICATION DATE: 02/05/2004
Name: EDIZ HOOK
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 8.4' N
USGS Quad: EDIZ HOOK Longitude: 123° 24.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 471 1974
DESIGNATION: E 471
MONUMENTATION: Vertical Control disk VM#: 9027
AGENCY: National Geodetic Survey (NGS) PID#: TR0785
SETTING CLASSIFICATION: Concrete foundation
The bench mark is a disk set vertically in the concrete foundation for the SE
wall of the Administration building, 26 m (84 ft) north of the centerline of the
road, 23 m (76 ft) WNW of a flag pole, 18 m (58 ft) SW of the center of the main
(SE) entrance door to the building, 0.15 m (0.5 ft) NE of the south corner of
the building, and 0.3 m (1 ft) above the ground.
BENCH MARK STAMPING:
DESIGNATION: EAST BASE
ALIAS: 5, NO STAMPING 1
MONUMENTATION: Drill Hole VM#: 9028
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Boulder
The bench mark is a 1 inch deep, 3/4-inch drill hole in the top of a boulder
that is buried about 0.3 m (1 ft) below ground level, 60 m (198 ft) NW of the NW
corner of the west one of two concrete buildings, 55 m (182 ft) ESE of the SE
corner of the landing strip, and 10.21 m (33.5 ft) SW of bench mark 6 1944.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9444122 PUBLICATION DATE: 02/05/2004
Name: EDIZ HOOK
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 8.4' N
USGS Quad: EDIZ HOOK Longitude: 123° 24.8' W
T I D A L D A T U M S
Tidal datums at EDIZ HOOK based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: May 1976 - April 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/24/1976) = 2.597
MEAN HIGHER HIGH WATER (MHHW) = 2.135
MEAN HIGH WATER (MHW) = 1.926
MEAN TIDE LEVEL (MTL) = 1.305
MEAN SEA LEVEL (MSL) = 1.282
MEAN LOW WATER (MLW) = 0.684
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.097
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (06/30/1976) = -1.249
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6 1944 5.222 3.296
TUCKER NO 1 1892 3.096 1.170
TUCKER NO 2 1892 3.097 1.171
D 471 1974 3.854 1.928
E 471 1974 3.540 1.614
EAST BASE 3.229 1.303
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9444122 PUBLICATION DATE: 02/05/2004
Name: EDIZ HOOK
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 8.4' N
USGS Quad: EDIZ HOOK Longitude: 123° 24.8' 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.