U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
To reach the tidal bench marks from U.S. Highway 101 in Port Angeles, proceed
west on U.S. Highway 101 (Marine Drive) through town to Cedar Street, turn north
on Cedar Street and go 0.2 mile (0.3 km) to Port of Port Angeles Log Terminal
Pier. The bench marks are along Marine Drive and First Street. The tide gauge
and electric tape gauge are in a red and white wood frame build- ing
approximately half-way out the pier and along the centerline.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: L 467 1974
MONUMENTATION: Survey Disk VM#: 1112
AGENCY: PID#: TR0790
SETTING CLASSIFICATION: Concrete Sidewalk
The primary bench mark is set in a sidewalk at the NE corner of the intersection
of Tumwater Street and Marine Drive, 77.0 feet (23.5 m) SE of a sign for Port of
Port Angeles Log Dump Entrance, 18.5 feet (5.6 m) SE of the east curb of
Tumwater Street, 10.8 feet (3.3 m) SE of the top center of a fire hydrant, 9.5
feet (2.9 m) NE of the north curb of Marine Drive, 1.1 feet (0.3 m) south of the
north edge of the sidewalk, and 1.0 foot (0.3 m) north of the south end of a
retaining wall.
BENCH MARK STAMPING: 11 1935
MONUMENTATION: Survey Disk VM#: 1113
AGENCY: PID#: TR0791
SETTING CLASSIFICATION: Stone Sill
The bench mark is set in the top of the stone sill at the main entrance to the
Federal Building at the intersection of Oak and First Streets, 56.5 feet (17.2
m) SE of the SE curb of Oak Street, 20.5 feet (6.2 m) SW of the SW curb of First
Street, 13.5 feet (4.1 m) NW of the entrance to the Federal Building, and 0.7
foot (0.2 m) NE of the NE face of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 13 1975
MONUMENTATION: Survey Disk VM#: 1115
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the concrete foundation of a trailer hoist on the Pen
Ply grounds NW of the Y intersection of Front, First, and Marine Streets, 88.3
feet (26.9 m) south of the SE corner of a log debarker, 70.2 feet (21.4 m) north
of the centerline of Marine Drive, and 1.7 feet (0.5 m) east of the south leg of
a trailer hoist.
BENCH MARK STAMPING: NO 14 1975
MONUMENTATION: Survey Disk VM#: 1116
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the concrete foundation of the Daily News Building at
305 West First Street, 107.5 feet (32.8 m) west of the centerline of Cherry
Street, 50.4 feet (15.4 m) north of the centerline of First Street, 9.9 feet
(3.0 m) north of the SW corner pillar of the building, and 0.3 foot (0.1 m) west
of the building west wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: A 471 1974
MONUMENTATION: Survey Disk VM#: 1117
AGENCY: PID#: TR0789
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set vertically in the SW face of the concrete foundation of a
large metal warehouse building, 0.65 mile (1.05 km) NW of the intersection of
Marine Drive and Tumwater Street, 0.2 mile (0.3 km) SE of the junction of Marine
Drive and Hill Street, 0.1 mile (0.2 km) NW of the junction of Marine Drive and
the public boat ramp entrance, 76.5 feet (23.3 m) NE of the centerline of Marine
Drive, 61.8 feet (18.8 m) SE of the west corner of the warehouse building, 12.4
feet (3.8 m) NW of the NW edge of the most northwesterly of four doors along the
SW side of the building, 11.8 feet (3.6 m) NW of the NW end of a small concrete
loading dock, and 2 feet (1 m) above grade.
BENCH MARK STAMPING: 4090 A 1981
MONUMENTATION: Survey Disk VM#: 1118
AGENCY: PID#: TR2551
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is set along the south side of Marine Drive, 670 feet (204 m) SE
of Bench Mark 4090 B 1981, 8.5 feet (2.6 m) SE of a fire hydrant, 8.5 feet (2.6
m) NW of utility pole #125 with a witness sign, and 3.2 feet (1.0 m) SW of the
SW curb of Marine Drive. The bench mark is 0.5 foot (0.2 m) above grade,
crimped to a galvanized steel rod driven 44 feet (13 m) to refusal, and encased
in a 4-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4090 B 1981
MONUMENTATION: Survey Disk VM#: 1119
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is set along the north side of Marine Drive, 146.5 feet (44.7 m)
north of the north corner of Washington Fire and Safety Equipment Company at 936
Marine Drive, 28.6 feet (8.7 m) NE of the centerline of Marine Drive, 18.5 feet
(5.6 m) SE of a utility pole with a grey firebox, 10.0 feet (3.0 m) SE of the
handrail end leading to Port Angeles Boat Grid, and 5.6 feet (1.7 m) SW of the
NE edge of a wooden sea wall. The bench mark is 0.5 foot (0.2 m) above grade,
crimped to a galvanized steel rod driven 36 feet (11 m) to refusal, and encased
in a 4-inch PVC pipe.
BENCH MARK STAMPING: 4090 C 1981
MONUMENTATION: Survey Disk VM#: 1120
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is set along the south side of Marine Drive, 0.2 mile (0.3 km) NW
of Bench Mark 4090 B 1981, 0.1 mile (0.2 km) SW of Bench Mark A 471 1974, 6.5
feet (2.0 m) NW of a fire hydrant, and 4.0 feet (1.2 m) SE of utility pole #134
with witness signs on both sides. The bench mark is at ground level, crimped to
a galvanized steel rod driven 24 feet (7 m) to refusal, and encased in a 4-inch
PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 8 RESET 1984
MONUMENTATION: Survey Disk VM#: 1121
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set in the sidewalk at 116 East First Street, 167.0 feet (50.9
m) SE of the south corner of Laurel and East First Streets, 17.0 feet (5.2 m) SW
of the SW curb of East First Street, 11.5 feet (3.5 m) Sw of wooden light post
#116E, and 0.4 foot (0.1 m) from the face of the building.
BENCH MARK STAMPING: 4090 D 1991
MONUMENTATION: Survey Disk VM#: 3096
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Flagpole Foundation
The bench mark is set flush in the concrete foundation for a flagpole in front
of the Port of Port Angeles office, 46.0 feet (14.0 m) west of the SW corner of
the office, 5.3 feet (1.6m) NE of a fire hydrant, and 0.8 foot (0.2 m) SE of
the flagpole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W
T I D A L D A T U M S
Tidal datums at PORT ANGELES, STRAIT OF JUAN DE FUCA based on:
LENGTH OF SERIES: 12 YEARS
TIME PERIOD: 1979-1990
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9449880 FRIDAY HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/27/1983) = 10.27
MEAN HIGHER HIGH WATER MHHW = 7.03
MEAN HIGH WATER MHW = 6.46
MEAN TIDE LEVEL MTL = 4.26
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 4.22
MEAN LOW WATER MLW = 2.06
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (06/13/1982) = -4.72
* NGVD reference based on adjustment of 1974 and NOS levels of 1991.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
L 467 1974 17.29 10.83
11 1935 28.10 21.64
TIDAL BM 13 1975 20.17 13.71
NO 14 1975 22.38 15.92
A 471 1974 14.59 8.13
4090 A 1981 13.88 7.42
4090 B 1981 13.63 7.17
4090 C 1981 17.56 11.10
TIDAL 8 RESET 1984 37.20 30.74
4090 D 1991 16.86 10.40
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
PUBLICATION DATE: 04/01/1992
Station ID: 9444090 SUPERCEDED DATE: 04/21/2003
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WASHINGTON
NOAA Chart: 18468 Latitude: 48° 7.5' N
USGS Quad: PORT ANGELES Longitude: 123° 26.4' 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.