U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' W
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 9 miles (14 km) 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 gage and staff were 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: TIDAL BM 7540 A 1978
MONUMENTATION: Survey Disk VM#: 8864
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Apron
The bench mark is set in a concrete apron around the restrooms at the U.S. Coast
Guard station, 120 feet (37 m) north of the NE corner of the Troller Restaurant,
66 feet (20 m) west of the centerline of South Mooring Drive, 4 feet (1 m) SE of
the SE corner of the restrooms, and 0.5 foot (0.2 m) north of the edge of the
concrete apron.
BENCH MARK STAMPING: 6 1927
MONUMENTATION: Survey Disk VM#: 8859
AGENCY: PID#: RD1243
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, 600 feet (183 m) west
of a large cement stack at Oceanside Lumber Company, 101 feet (31 m) east of
Second Street between buildings 114 and 116, 31.5 feet (9.6 m) north of U.S.
Highway 101 at the SW corner of a one-story building, and 3 feet (1 m) north of
the west end of a concrete walk in front of an empty store.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 7 1957
MONUMENTATION: Survey Disk VM#: 8860
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set in the top of a 3.5-foot (1.1 m) high concrete retaining
wall at the southwesterly corner of Gregs Marine Service (formerly
Oregon-Washington Plywood Company), 87 feet (27 m) NE of the centerline of a
dirt road, 11.9 feet (3.6 m) NE of the NE edge of a 12x16-foot (4 x 5 m)
concrete slab, and 6.5 feet (2.0 m) SE of the SW corner of the building.
BENCH MARK STAMPING: TIDAL 10 1970
MONUMENTATION: Survey Disk VM#: 8861
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set near the SW corner of a 5 x 6-foot (2 x 2 m) concrete slab
at the inshore end of the walkway to the U.S. Coast Guard Station, 81 feet (25
m) SE of a utility pole with light and electric meter, 57.5 feet (17.5 m) north
of a 90o bend in the guard rail, 43.5 feet (13.3 m) west of the west wall of the
U.S. Coast Guard boathouse, 33 feet (10 m) south of the SE corner of a green
fuel storage tank, and 7.5 feet (2.3 m) SW of a lamp post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 11 1970
MONUMENTATION: Survey Disk VM#: 8862
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set near the NW corner of a 24.5-foot (7.5 m) square concrete
slab attached to the west wall of a fish cleaning building, near the NW corner
of the boat basin, 124 feet (38 m) east of the west end of the boat basin
extended, 35 feet (11 m) south of the centerline of an east/west blacktop road,
20.5 feet (6.2 m) north of utility pole #GA-A-48 L5-L1-SPL, 1.0 foot (0.3 m)
south of a metal post supporting a roof, and 0.5 foot (0.2 m) east of the west
edge and south of the north edge of the concrete slab.
BENCH MARK STAMPING: TIDAL BM 12 1974
MONUMENTATION: Survey Disk VM#: 8863
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set vertically in the east wall of the Garibaldi Municipal
Building, located at the SW corner of South Street and Acacia Avenue, 68 feet
(21 m) south of the street corner, 2 feet (1 m) north of the door leading to the
city offices, and 1 foot (0.3 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 7540 B 1978
MONUMENTATION: Survey Disk VM#: 8865
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Walkway
The bench mark is set in a 5-foot (2 m) wide walkway along South Commerial Drive
at the corner of South Commerial Drive and South Mooring Drive, 81 feet (25 m)
south of the SW corner of Joes Charter Cafe, 79 feet (24 m) east of the NE
corner of the Bayside Restaurant, 75 feet (23 m) north of the breakwater, 35
feet (11 m) south of the centerline of South Commerial Drive, 3 feet (1 m) north
of a fire hydrant, and 0.7 foot (0.2 m) north of the edge of the walkway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' W
T I D A L D A T U M S
Tidal datums at GARIBALDI, TILLAMOOK BAY based on:
LENGTH OF SERIES: 6 YEARS
TIME PERIOD: 1971-1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9439040 ASTORIA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/07/1978) = 11.76
MEAN HIGHER HIGH WATER (MHHW) = 7.98
MEAN HIGH WATER (MHW) = 7.27
MEAN TIDE LEVEL (MTL) = 4.28
MEAN LOW WATER (MLW) = 1.30
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (06/01/1973) = -2.93
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
TIDAL BM 7540 A 1978 15.24 7.97
6 1927 14.07 6.80
NO 7 1957 15.17 7.90
TIDAL 10 1970 14.50 7.23
TIDAL 11 1970 15.66 8.39
TIDAL BM 12 1974 25.85 18.58
TIDAL BM 7540 B 1978 14.98 7.71
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 10/26/1987
Station ID: 9437540 SUPERCEDED DATE: 04/21/2003
Name: GARIBALDI, TILLAMOOK BAY
OREGON
NOAA Chart: 18558 Latitude: 45° 33.5' N
USGS Quad: NEHALEM Longitude: 123° 45.7' 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.