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Datums Page Page 1 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
To reach the tidal bench marks from Seattle, cross Puget Sound on a Ferry, then
via automobile follow signs to Hood Canal Bridge and then to U.S. Highway 101.
Follow 101 to Port Angeles, stay on 101 through the town and turn right on Cedar
Street, and proceed to port of Port Angeles Log Terminal Pier. The tidal bench
marks are located along Marine Drive and in the vicinity of Terminal Pier. The
tide gauge is located inside the red and white frame building on the Pier.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: L 467 1974
DESIGNATION: L 467
MONUMENTATION: Bench Mark disk VM#: 1112
AGENCY: National Geodetic Survey (NGS) IDB PID#: TR0790
SETTING CLASSIFICATION: Pavement OPUS PID#: TR0790
LATITUDE: 48° 7.4' N ( 48.12303) LONGITUDE: 123° 26.8' W (-123.44606)
The primary bench mark is a disk set in a sidewalk at the junction of Tumwater
Street and Marine Drive on the NE corner of the intersection, 23.47 m (77.0 ft)
SE of a sign labeled Port of Port Angeles Log Dump Entrance which is on the
north side of Marine Drive, 5.64 m (18.5 ft) SE of the east curb of Tumwater
Street, 3.29 m (10.8 ft) SE of the top center of a fire hydrant, 2.90 m (9.5 ft)
NE of the north curb of Marine Drive, 0.34 m (1.1 ft) south of the north edge of
the sidewalk, and 0.15 m (0.5 ft) below ground under metal cover labeled "MON".
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 11 1935
DESIGNATION: TIDAL 11
MONUMENTATION: Bench Mark disk VM#: 1113
AGENCY: National Geodetic Survey (NGS) IDB PID#: TR0791
SETTING CLASSIFICATION: Stone sill of a building OPUS PID:
LATITUDE: 48° 7.2' N ( 48.11953) LONGITUDE: 123° 26.1' W (-123.43514)
The bench mark is a disk set on top of stone sill 4.11 m (13.5 ft) NW of the
main entrance to the Federal Building, 17.22 m (56.5 ft) SE of the SE curb of
Oak Street, 6.25 m (20.5 ft) SW of the SW curb of First Street, 0.21 m (0.7 ft)
NE of the NE face of the building, and level with the entrance way.
BENCH MARK STAMPING: TIDAL BM 13 1975
DESIGNATION: 944 4090 TIDAL BM 13
MONUMENTATION: Tidal Station disk VM#: 1115
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 7.3' N ( 48.12175) LONGITUDE: 123° 26.4' W (-123.44031)
The bench mark is a disk set flush in the foundation for a trailer hoist on the
Pen Ply grounds, 0.4 km (0.3 mi) west of post office, NW of the "Y" intersection
of West Front Street, West First Street, and Marine Drive, 26.91 m (88.3 ft)
south of the SE corner of log debarker, 21.40 m (70.2 ft) north of the
centerline of Marine Drive, and 0.5 m (1.7 ft) east of the south leg of a
trailer hoist.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 14 1975
DESIGNATION: 944 4090 TIDAL 14
MONUMENTATION: Tidal Station disk VM#: 1116
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 7.2' N ( 48.12083) LONGITUDE: 123° 26.3' W (-123.43772)
The bench mark is a disk set flush in the foundation of the Peninsula Daily News
Building at 305 West First Street, 0.2 km (0.1 mi) west of Federal Building,
32.77 m (107.5 ft) west of the centerline of Cherry Street, 15.36 m (50.4 ft)
north of the centerline of First Street, 3.02 m (9.9 ft) north of the SW corner
pillar of the building, and 0.09 m (0.3 ft) west of west wall.
BENCH MARK STAMPING: 4090 A 1981
DESIGNATION: 944 4090 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 1118
AGENCY: National Ocean Service (NOS) IDB PID#: TR2551
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 48° 7.4' N ( 48.12367) LONGITUDE: 123° 27.1' W (-123.45117)
The bench mark is a disk located 204 m (670 ft) SE of bench mark 4090 B 1981,
2.59 m (8.5 ft) SE of a red and yellow fire hydrant and 2.59 m (8.5 ft) NW of
Utility Pole # 125 which has a witness post sign, and 0.98 m (3.2 ft) SW of the
SW curb of Marine Drive. The bench mark is set 0.15 m (0.5 ft) above ground,
crimped to the top of a galvanized steel rod driven 13.4 m (44 ft) to refusal,
and encased with a 4-inch PVC pipe and octagonal cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4090 B 1981
DESIGNATION: 944 4090 B
MONUMENTATION: Tidal Station disk VM#: 1119
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 48° 7.5' N ( 48.12489) LONGITUDE: 123° 27.2' W (-123.45350)
The bench mark is a disk located 204 m (670 ft) NW of BM A 1981, 44.65 m (146.5
ft) north of the north corner of Washington Fire and Safety Equipment Company at
936 Marine Drive, 8.73 m (28.6 ft) NE of the centerline of Marine Drive, 5.64 m
(18.5 ft) SE of a utility pole with a grey firebox and power meter, 3.05 m (10.0
ft) SE of the handrail leading to the Port Angeles floating boat house dock,
1.71 m (5.6 ft) SW of the NE edge of wooden sea wall, and 0.30 m (1.0 ft) SW of
NOS orange witness post. The bench mark is set 0.15 m (0.5 ft) above grade,
crimped to the top of a galvanized steel rod driven 10.7 m (35 ft) to refusal,
and encased in a 4-inch PVC pipe and octagonal cap.
BENCH MARK STAMPING: 4090 C 1981
DESIGNATION: 944 4090 C
MONUMENTATION: Tidal Station disk VM#: 1120
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 48° 7.6' N ( 48.12603) LONGITUDE: 123° 27.4' W (-123.45714)
The bench mark is a disk located 0.3 km (0.2 mi) NW of bench mark 4090 B 1981,
0.2 km (0.1 mi) SW of bench mark A 471 1974, 1.68 m (5.5 ft) NW of a yellow and
red fire hydrant, 1.22 m (4.0 ft) SE of the center of Utility Pole #134 which
has two witness post signs on either side of the pole, and 1.04 m (3.4 ft) SSW
of curb. The bench mark is crimped to the top of a galvanized steel rod driven
7.3 m (24 ft) to refusal, and encased in a 4-inch PVC pipe with cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4090 D 1991
DESIGNATION: 944 4090 D
MONUMENTATION: Tidal Station disk VM#: 3096
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 48° 7.5' N ( 48.12436) LONGITUDE: 123° 26.6' W (-123.44306)
The bench mark is a disk set flush in the concrete foundation in front of the
port of Port Angeles office, 14.02 m (46.0 ft) west of SW corner of port of Port
Angeles office building, 3.20 m (10.5 ft) south and 0.40 m (1.3 ft) north of a
yellow concrete post, 1.62 m (5.3 ft) NE of a fire hydrant, and 0.80 m (2.6 ft)
below gound level with an access plate.
BENCH MARK STAMPING: 4090 E 1992
DESIGNATION: 944 4090 E
MONUMENTATION: Tidal Station disk VM#: 12913
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 48° 7.5' N ( 48.12472) LONGITUDE: 123° 26.5' W (-123.44114)
The bench mark is a disk set in a 0.98 m x 2.29 m (3.2 ft x 7.5 ft) concrete
transformer pad located about 61 m (200 ft) west of east end of pier and on the
west side of the electrical building, 2.62 m (8.6 ft) SE of southern most
rolling crane rail on pier, 0.70 m (2.3 ft) east of manhole cover marked
"water", and 0.09 m (0.3 ft) east of NW corner of pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4090 F 2011
DESIGNATION: 944 4090 F
MONUMENTATION: Tidal Station disk VM#: 20189
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Set in concrete pad OPUS PID:
LATITUDE: 48° 7.3' N ( 48.12222) LONGITUDE: 123° 26.6' W (-123.44392)
The benchmark is a disk set in the top of a 1.00 m (3.3 ft) X 2.50 m (8.2 ft)
concrete pad located 16.00 m (52.5 ft) east of power pole number AI364579
located on the easternmost corner of the intersection of Marine drive and North
Cedar street, 12.00 m (39.4 ft) NW of a steel utility grate and 7.60 m (24.9 ft)
north of an aluminum light pole on the northern side of Marine Drive, and
recessed 0.15 m (0.5 ft) below the surrounding curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
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: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/02/2003) = 3.204
MEAN HIGHER HIGH WATER MHHW = 2.153
MEAN HIGH WATER MHW = 1.987
MEAN SEA LEVEL MSL = 1.295
MEAN TIDE LEVEL MTL = 1.287
MEAN LOW WATER MLW = 0.586
North American Vertical Datum NAVD88 = 0.129
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (06/13/1982) = -1.474
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
L 467 1974 5.235 3.248
11 1935 8.533 6.546
TIDAL BM 13 1975 6.109 4.122
NO 14 1975 6.786 4.799
4090 A 1981 4.198 2.211
4090 B 1981 4.108 2.121
4090 C 1981 5.319 3.332
4090 D 1991 5.079 3.092
4090 E 1992 5.101 3.114
4090 F 2011 5.121 3.134
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
Foot Notes:
Bench mark 4090 F 2011 is based on one differential leveling connection and do
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 9444090 PUBLICATION DATE: 09/30/2011
Name: PORT ANGELES, STRAIT OF JUAN DE FUCA
WA
NOAA Chart: 18468 Latitude: 48° 7.5' N ( 48.12500)
USGS Quad: PORT ANGELES Longitude: 123° 26.4' W (-123.44000)
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.