U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 12/03/1990
Station ID: 9444122 SUPERCEDED DATE: 04/21/2003
Name: EDIZ HOOK, STRAIT OF JUAN DE FUCA
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 1.3 miles
(2.1 km) to Ediz Hook and continue east on a paved road for 2.7 miles (4.3 km)
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 gage
and staff were 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
MONUMENTATION: Survey Disk VM#: 9025
AGENCY: PID#: TR0779
SETTING CLASSIFICATION: Concrete Platform
The bench mark is set in the top of the SE corner of the southern search light
platform at the east end of the landing strip, and 5.5 feet (1.7 m) above the
ground.
BENCH MARK STAMPING: TUCKER NO 1 1892
MONUMENTATION: Survey Disk VM#: 9023
AGENCY: PID#: TR0783
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a round concrete monument near a fog/beacon
building at the end of the hook, 401 feet (122 m) SE of Bench Mark NO STAMPING
1, 57 feet (17 m) NE of the northwesternmost of three antenna poles, and 0.4
foot (0.1 m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 12/03/1990
Station ID: 9444122 SUPERCEDED DATE: 04/21/2003
Name: EDIZ HOOK, STRAIT OF JUAN DE FUCA
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
MONUMENTATION: Survey Disk VM#: 9024
AGENCY: PID#: TR0782
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a round concrete monument near the
fog/beacon building at the end of the hook, 401 feet (122 m) SE of Bench Mark NO
STAMPING 1, 70 feet (21 m) north of the northwesternmost of three antenna poles,
and 0.4 foot (0.1 m) above the ground.
BENCH MARK STAMPING: D 471 1974
MONUMENTATION: Survey Disk VM#: 9026
AGENCY: PID#: TR0784
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set vertically in the concrete foundation for the NW wall of a
hangar, about 265 feet (81 m) east of the Administration building, 17.6 feet
(5.4 m) NW of the NW edge of the SW entrance door to the hangar, 0.5 foot (0.2
m) NE of the west corner of the hangar, and 1.5 feet (0.5 m) above the ground.
BENCH MARK STAMPING: E 471 1974
MONUMENTATION: Survey Disk VM#: 9027
AGENCY: PID#: TR0785
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set vertically in the concrete foundation for the SE wall of
the Administration building, 84 feet (26 m) north of the centerline of the road,
76 feet (23 m) WNW of a flag pole, 58 feet (18 m) SW of the center of the main
(SE) entrance door to the building, 0.5 foot (0.2 m) NE of the south corner of
the building, and 1 foot (0.3 m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 12/03/1990
Station ID: 9444122 SUPERCEDED DATE: 04/21/2003
Name: EDIZ HOOK, STRAIT OF JUAN DE FUCA
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: NO STAMPING 1
MONUMENTATION: Drill Hole VM#: 9028
AGENCY: PID:
SETTING CLASSIFICATION: Boulder
The bench mark is a 3/4-inch drill hole in the top of a boulder, about 165 feet
(50 m) ESE of the south side of the east end of the landing strip, and 33.5 feet
(10.2 m) SW of Bench Mark 6 1944.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 12/03/1990
Station ID: 9444122 SUPERCEDED DATE: 04/21/2003
Name: EDIZ HOOK, STRAIT OF JUAN DE FUCA
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, STRAIT OF JUAN DE FUCA based on:
LENGTH OF SERIES: 8 MONTHS
TIME PERIOD: MAY 1976 - APRIL 1977
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 (10/24/1976) = 8.69
MEAN HIGHER HIGH WATER (MHHW) = 6.97
MEAN HIGH WATER (MHW) = 6.30
MEAN TIDE LEVEL (MTL) = 4.26
* NATIONAL GEODETIC VERTICAL DATUM-1929 (NGVD) = 4.18
MEAN LOW WATER (MLW) = 2.23
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (06/30/1976) = -3.93
* NGVD reference based on elevations published in Quad L23453, 1974, and NOS
leveling of 1978.
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6 1944 17.30 11.00
TUCKER NO 1 1892 10.32 4.02
TUCKER NO 2 1892 10.33 4.03
D 471 1974 12.81 6.51
E 471 1974 11.78 5.48
NO STAMPING 1 10.83 4.53
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 12/03/1990
Station ID: 9444122 SUPERCEDED DATE: 04/21/2003
Name: EDIZ HOOK, STRAIT OF JUAN DE FUCA
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.