U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
To reach the tidal bench marks from the intersection of State Highway 6 and U.S.
Highway 101, proceed north on U.S. Highway 101 for 14 km (9 mi) to the U.S.
Coast Guard Tillamook Bay Station in Garibaldi. The bench marks are located in
the areas around the U.S. Coast Guard station and the Oceanside Lumber Company.
The tide gauge is located on the Coast Guard pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7540 H 2005
DESIGNATION: 943 7540 H
MONUMENTATION: Flange-encased Rod VM#: 17879
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBBB78
LATITUDE: 45° 33.3' N ( 45.55544) LONGITUDE: 123° 55.0' W (-123.91603)
The bench mark is a 3D mark driven to 24.00 m (78.74 ft) located on the west
side and in the inside 120 degree corner of a wooden border around a memorial
area in the marina area of Garibaldi, 50.00 m (164.4 ft) north of the entrance
to the coast guard station, and 8.80 m (28.87 ft) south of the middle of Coast
Guard Way.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: OSMB 2914 1996
DESIGNATION: 943 7540 OSMB
MONUMENTATION: Bench Mark disk VM#: 17874
AGENCY: IDB PID:
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 45° 33.4' N ( 45.55644) LONGITUDE: 123° 54.9' W (-123.91458)
The bench mark is a disk set in the end of a concrete walkway leading to a wood
walkway for the Garibaldi Marina boat ramp launch, 15.70 m (51.5 ft) north of a
flagpole outside the Garibaldi Marina, 14.00 m (45.9 ft) south of light pole
#215415, 13.10 m (43.0 ft) east of centerline of Mooring Road, and 0.60 m (2.0
ft) above the ramp.
BENCH MARK STAMPING: 7540 G 2005
DESIGNATION: 943 7540 G
MONUMENTATION: Flange-encased Rod VM#: 17875
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 45° 33.4' N ( 45.55678) LONGITUDE: 123° 54.9' W (-123.91506)
The bench mark is a stainless steel rod set in a landscaped area just in front
of the Port of Garibaldi sign at the port entrance, 7.10 m (23.3 ft) SW of the
middle of Mooring Road, 2.70 m (8.9 ft) NE of the SW curb of the landscaped
area, 1.80 m (5.9 ft) north of the center pole that supports the entrance sign
for the marina with witness post sign attached, crimped to a stainless steel rod
driven 15.00 m (49.2 ft) to substantial resistance, and encased in a PVC pipe
with an aluminum access lid.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7540 F 2005
DESIGNATION: 943 7540 F
MONUMENTATION: Flange-encased Rod VM#: 17877
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 45° 33.4' N ( 45.55719) LONGITUDE: 123° 54.8' W (-123.91361)
The bench mark is set inside a cyclone fence, located in a trailer park in the
NW corner of 6th Street and Biak Avenue in the marina area of Garibaldi, 18.70 m
(61.4 ft) SW of a white fire hydrant on the NE corner of 6th Street and Biak
Avenue, 8.80 m (28.9 ft) west of a sewer cover in the middle of the south end of
6th Street, 6.90 m (22.6 ft) NW of the centerline of Biak Street, and 0.45 m
(1.5 ft) SW of a witness post, crimped to a stainless steel rod driven 21.90 m
(71.8 ft) to substantial resistance, and encased in a PVC pipe with an aluminum
access lid.
BENCH MARK STAMPING: 7540 D 2005
DESIGNATION: 943 7540 D
MONUMENTATION: Tidal Station disk VM#: 17880
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete wharf OPUS PID:
LATITUDE: 45° 33.3' N ( 45.55486) LONGITUDE: 123° 55.0' W (-123.91636)
The bench mark is a disk set in the concrete wharf just inside the entrance gate
of the Coast Guard Base in Garibaldi, 14.10 m (46.26 ft) south of west end of
gate opening, 10.30 m (33.79 ft) NW of flagpole, and 0.20 m (0.66 ft) SSE of
northern mostly bullrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7540 C 2005
DESIGNATION: 943 7540 C
MONUMENTATION: Tidal Station disk VM#: 17881
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete wharf OPUS PID:
LATITUDE: 45° 33.3' N ( 45.55458) LONGITUDE: 123° 55.0' W (-123.91697)
The bench mark is a disk set in the concrete wharf leading to walkway for
boathouse inside the Coast Guard Base in Garibaldi, 7.60 m (24.93 ft) SSE of a
three door outbuilding for chemical storage, 3.10 m (10.17 ft) NNE of northern
most rail leading to boathouse, and 0.60 m (1.97 ft) ENE of west face of wharf.
BENCH MARK STAMPING: 7540 L 2017
DESIGNATION: 943 7540 TIDAL L
MONUMENTATION: Tidal Station disk VM#: 22464
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 45° 33.3' N ( 45.55450) LONGITUDE: 123° 54.8' W (-123.91378)
The bench mark is a disk set flush in concrete at the garage door opening to
ocean charters building on 611 Commercial Street, 27.30 m (89.6 ft) south of the
SW corner of Fisherman's Korner restaurant, 25.90 m (85.0 ft) SE of a white fire
hydrant at the NW corner of Commercial Street and Mooring Drive, 13.30 m (43.6
ft) west of the NE corner of ocean charters building, 4.80 m (15.7 ft) east of
the NW corner of the ocean charters building, 0.10 m (0.3 ft) west of the east
side of the garage door entrance to ocean charters building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
T I D A L D A T U M S
Tidal datums at GARIBALDI, TILLAMOOK BAY based on:
LENGTH OF SERIES: 12 YEARS
TIME PERIOD: May 2007 - April 2019
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9439040 ASTORIA, TONGUE POINT, COLUMBIA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/31/2005) = 3.636
MEAN HIGHER HIGH WATER MHHW = 2.536
MEAN HIGH WATER MHW = 2.320
MEAN SEA LEVEL MSL = 1.374
MEAN TIDE LEVEL MTL = 1.369
MEAN LOW WATER MLW = 0.418
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (11/26/2007) = -1.057
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7540 H 2005 4.437 2.117
OSMB 2914 1996 3.867 1.547
7540 G 2005 5.156 2.836
7540 F 2005 4.850 2.530
7540 D 2005 4.806 2.486
7540 C 2005 4.804 2.484
7540 L 2017 4.590 2.270
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9437540 PUBLICATION DATE: 10/21/2020
Name: GARIBALDI, TILLAMOOK BAY
OR
NOAA Chart: 18558 Latitude: 45° 33.3' N ( 45.55453)
USGS Quad: NEHALEM Longitude: 123° 55.1' W (-123.91894)
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.