U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
To reach the tidal bench marks from U.S. Highway 101 (Oregon Coast Highway)
proceed east on SE Bay Street for 0.3 mile (0.5 km), turn west onto SE Coast
Guard Drive and proceed into the harbor parking lot, turn south and go to the
third pier from the north. The bench marks were located near the U.S. Highway
101 bridge over the entrance to Depoe Bay and near the seawall east of Depoe
Bay. The tide gage and staff were located at the foot of Pier 4.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 6 1973
MONUMENTATION: Survey Disk VM#: 8846
AGENCY: PID#: QE1420
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set flush in the NW corner of a 4.5 x 6.0-foot (1.4 x 1.8 m)
concrete slab (former support for a fuel tank) on the east side of the harbor,
43 feet (13 m) south of the centerline of a macadam road, 36.5 feet (11.1 m) SW
of a 30-foot (9 m) high fir tree, and 17.0 feet (5.2 m) north of the NE corner
of the U.S. Coast Guard station.
BENCH MARK STAMPING: Q198 1940
MONUMENTATION: Survey Disk VM#: 8840
AGENCY: PID#: QE1164
SETTING CLASSIFICATION: Sidewalk
The bench mark is set in the top of the walk at the extreme NW corner of the
U.S. Highway 101 bridge, 15.8 feet (4.8 m) north of the subway entrance, 13.8
feet (4.2 m) west of Bench Mark REEF 1952, 0.9 foot (0.3 m) east of a concrete
rail with a Depoe Bay Bridge nameplate, and just below the nameplate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: T126 1941
MONUMENTATION: Survey Disk VM#: 8841
AGENCY: PID#: QE1165
SETTING CLASSIFICATION: Concrete Base
The bench mark is set in the SW corner of the concrete base of Fishermans
Memorial, west of a parapet wall, 815 feet (248 m) north of the north end of the
bridge, and 90 feet (27 m) west of the highway.
BENCH MARK STAMPING: NO 1 1952
MONUMENTATION: Survey Disk VM#: 8842
AGENCY: PID#: QE1426
SETTING CLASSIFICATION: Rock Outcrop
The bench mark is set flush in a rock outcrop on the south shore of the entrance
to Depoe Bay, 36 feet (11 m) NW of the NW corner of Columbia River Packers
Associated Cannery wharf building, 32 feet (10 m) NE of the SE arch-pier of the
bridge, and 25 feet (8 m) below the cannery wharf floor.
BENCH MARK STAMPING: NO 2 1952
MONUMENTATION: Survey Disk VM#: 8843
AGENCY: PID:
SETTING CLASSIFICATION: Retaining Wall
The bench mark is set flush in the top of a retaining wall extending east- ward
from the NE corner of the arch-pier of the bridge, 25 feet (8 m) west of the
U.S. Army Corps of Engineers traverse monument No. 1, and 3 feet (1 m) east of
the NE corner of the highway bridge arch-pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: REEF 1952
MONUMENTATION: Survey Disk VM#: 8844
AGENCY: PID#: QE1418
SETTING CLASSIFICATION: Sidewalk
The bench mark is set flush in the surface of the bridge sidewalk at the NW end
of the bridge, 13.8 feet (4.2 m) east of Bench Mark Q198 1940, 14 feet (4 m)
north of the NW end of the concrete guardrail, 4.5 feet (1.4 m) west of the east
edge of the bridge curb, and 1.5 feet (0.5 m) south of the north edge of the
bridge sidewalk.
BENCH MARK STAMPING: REEF NO 1 1952
MONUMENTATION: Survey Disk VM#: 8845
AGENCY: PID#: QE1419
SETTING CLASSIFICATION: Sidewalk
The bench mark is set flush in the surface of the sidewalk leading to a
pedestrian subway at the NE end of the bridge, 2.5 feet (0.8 m) west of the east
edge of the concrete guardrail, and 2.5 feet (0.8 m) north of the edge of the
first step of the subway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 9 1973
MONUMENTATION: Survey Disk VM#: 8847
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the top of a concrete seawall on the east side of
the harbor, 241 feet (73 m) NW of Bench Mark 5827 C 1981, 6 feet (2 m) north of
the ramp leading to float number 4, 5 feet (2 m) SW of utility pole #B08B40, 0.7
foot (0.2 m) east of the west edge of the seawall, and 0.5 foot (0.2 m) below
the top of the sidewalk in a covered PVC pipe. (Note: The mark has been
partially covered with concrete and is difficult to level to highest point on
disk.)
BENCH MARK STAMPING: 5827 A 1981
MONUMENTATION: Survey Disk VM#: 8848
AGENCY: PID#: QE1425
SETTING CLASSIFICATION: Concrete Dam
The bench mark is set in the top of a dam/fish ladder combination located at the
SE corner of Depoe Bay Harbor, 152 feet (46 m) SE of Bench Mark 5827 B 1981, 31
feet (9 m) NE of the SE corner of the fish ladder, 18.7 feet (5.7 m) west of the
shoreline, and 16 feet (5 m) SE of the NE edge of the dam/fish ladder
combination.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5827 B 1981
MONUMENTATION: Survey Disk VM#: 8849
AGENCY: PID#: QE1424
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is set on the east side of the gravel road leading to the
dam/fish ladder combination at the SE corner of Depoe Bay Harbor, 152 feet (46
m) NW of Bench Mark 5827 A 1981, 124 feet (38 m) south of Bench Mark 5827 C
1981, 101 feet (31 m) SE of the southernmost corner of the seawall on the east
side of the harbor, 65 feet (20 m) SE of utility pole #B08B12, 33 feet (10 m) NE
of the harbor shoreline, and 2.5 feet (0.8 m) SW of a witness post. The bench
mark is 0.2 foot (0.1 m) below ground level, crimped to the top of a galvanized
steel rod driven 23 feet (7 m), and encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 5827 C 1981
MONUMENTATION: Survey Disk VM#: 8850
AGENCY: PID#: QE1423
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is set on east side of the parking lot at Depoe Bay Harbor, 241
feet (73 m) SE of Bench Mark NO 9 1973, 124 feet (38 m) north of Bench Mark 5827
B 1981, 60 feet (18 m) NE of the southernmost point of the seawall, 53 feet (16
m) north of utility pole #B08B12, 5.8 feet (1.8 m) east of the eastern edge of
the harbor parking lot, and 2.9 feet (0.9 m) west of a witness post. The bench
mark is 0.3 foot (0.1 m) below ground level, crimped to the top of a galvanized
steel rod driven 28 feet (9 m), and encased in a PVC pipe and concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PORT MON NO 5
MONUMENTATION: Survey Disk VM#: 8851
AGENCY: PID#: QE1422
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the northern corner of the eastern seawall of
Depoe Bay, 62 feet (19 m) NW of a manhole cover at the curve of Coast Guard
Avenue where it curves around the NW corner of the U.S. Coast Guard station, 37
feet (11 m) north of utility pole #B08B-8, and 0.5 foot (0.2 m) SE of a
guardrail post in the north corner of the eastern seawall of the bay.
BENCH MARK STAMPING: C13TH COAST GUARD
MONUMENTATION: Survey Disk VM#: 8852
AGENCY: PID#: QE1421
SETTING CLASSIFICATION: Concrete Column
The bench mark is set in the top of a 0.5-foot (0.2 m) diameter concrete column,
63.5 feet (19.4 m) SW of the flagpole in front of the U.S. Coast Guard station,
59 feet (18 m) east of the west edge of the seawall, 1.0 foot (0.3 m) south of
the SW corner of the fence surrounding the station, and at ground level. (Note:
formerly designated BM 8 1974)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' W
T I D A L D A T U M S
Tidal datums at DEPOE BAY based on:
LENGTH OF SERIES: 10 YEARS
TIME PERIOD: 1974-1983
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9419750 CRESCENT CITY, CA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/26/1983) = 12.37
MEAN HIGHER HIGH WATER MHHW = 8.28
MEAN HIGH WATER MHW = 7.58
MEAN TIDE LEVEL MTL = 4.47
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 4.08
MEAN LOW WATER MLW = 1.36
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (05/24/1982) = -3.18
* NGVD reference based on elevations published in Quad 64 Orego, 1957, and
NOS leveling of 1984.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 6 1973 16.17 8.59
Q198 1940 62.46 54.88
T126 1941 58.34 50.76
NO 1 1952 14.79 7.21
NO 2 1952 17.07 9.49
REEF 1952 62.33 54.75
REEF NO 1 1952 62.53 54.95
NO 9 1973 12.92 5.34
5827 A 1981 13.15 5.57
5827 B 1981 13.45 5.87
5827 C 1981 14.03 6.45
PORT MON NO 5 13.09 5.51
C13TH COAST GUARD 15.06 7.48
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
PUBLICATION DATE: 10/28/1986
Station ID: 9435827 SUPERCEDED DATE: 04/21/2003
Name: DEPOE BAY
OREGON
NOAA Chart: 18561 Latitude: 44° 48.6' N
USGS Quad: CAPE FOULWEATHER Longitude: 124° 3.5' 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.