U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 08/14/1989
Station ID: 9432895 SUPERCEDED DATE: 04/21/2003
Name: NORTH BEND, COOS BAY
OREGON
NOAA Chart: 18587 Latitude: 43° 24.6' N
USGS Quad: NORTH BEND Longitude: 124° 13.1' W
To reach the tidal bench marks from the North Bend Post Office at the
intersection of McPherson and Connecticut Avenues, proceed south on McPherson
Avenue for one half block, turn east on California Avenue for 0.3 mile (0.5
km) to Sea Term Services Inc. located on the north side of California Avenue,
enter through the south gate and proceed north for 0.2 mile (0.3 km) to a dock
located on the east side of the yard. The bench marks are along the Southern
Pacific Railroad tracks. The tide gage was on the inside SW corner of the dock,
and the staff was lag bolted on the southernmost dock piling.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BENCH MARK NO 3 1960
MONUMENTATION: Survey Disk VM#: 8809
AGENCY: PID#: OA0654
SETTING CLASSIFICATION: Sidewalk
The bench mark is set flush in a sidewalk located on the south side and east end
of California Avenue at the NE corner of the Jones Oregon Stevedoring Company
building, 232 feet (71 m) east of the centerline of the main line of the
railroad tracks, 31 feet (9 m) south of the centerline of California Avenue, 1
foot (0.3 m) west of the east end of a 5-foot (2 m) wide concrete sidewalk, and
at ground level.
BENCH MARK STAMPING: 23 1917
MONUMENTATION: Survey Disk VM#: 8808
AGENCY: PID#: OA0499
SETTING CLASSIFICATION: Concrete Bannister
The bench mark is set flush in the SE concrete bannister at the top of a flight
of concrete stairs, SW of the intersection of Washington Avenue and the Southern
Pacific railroad tracks, 59 feet (18 m) south of utility pole #PPL 2513 158707
on the north side of Washington Avenue, 36 feet (11 m) west of the centerline of
the main line of the railroad tracks, and 21 feet (6 m) NE of the centerline of
Stanton Avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 08/14/1989
Station ID: 9432895 SUPERCEDED DATE: 04/21/2003
Name: NORTH BEND, COOS BAY
OREGON
NOAA Chart: 18587 Latitude: 43° 24.6' N
USGS Quad: NORTH BEND Longitude: 124° 13.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: HLT 6 1965
MONUMENTATION: Survey Disck VM#: 8810
AGENCY: PID#: OA0626
SETTING CLASSIFICATION: Concrete Steps
The bench mark is set flush in the top NW corner of a flight of concrete stairs,
SW of the intersection of Washington Avenue and the Southern Pacific railroad
tracks, 53 feet (16 m) south of utility pole #PPL 2513 158707 on the north side
of Washington Avenue, 44 feet (13 m) west of the centerline of the main line of
the railroad tracks, and 18 feet (5 m) NE of the centerline of Stanton Avenue.
BENCH MARK STAMPING: NORTH BEND TIDAL NO 1 1976
MONUMENTATION: Survey Disk VM#: 8811
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified
The bench mark is 300 feet (91 m) north of the driveway of Sea Term Services
Inc., 6 feet (2 m) east of the railroad tracks, and 2 feet (1 m) south of
railroad siding switch #3755.
BENCH MARK STAMPING: NORTH BEND TIDAL 2 1976
MONUMENTATION: Survey Disk VM#: 8812
AGENCY: PID#: OA0656
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is at the main doorway of Sea Term Services, Inc. warehouse, at
the east side of the doorway, and 1 foot (0.3 m) south of the wall in short
foundation remains.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 08/14/1989
Station ID: 9432895 SUPERCEDED DATE: 04/21/2003
Name: NORTH BEND, COOS BAY
OREGON
NOAA Chart: 18587 Latitude: 43° 24.6' N
USGS Quad: NORTH BEND Longitude: 124° 13.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NORTH BEND 4 PORTLAND DIST 1976
MONUMENTATION: Survey Disk VM#: 8813
AGENCY: PID#: OA0627
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set flush in the SW corner of a 35.5 x 101.5-foot (10.8 x 30.9
m) abandoned concrete slab, 60 feet (18 m) north of the centerline of Virginia
Avenue, 51 feet (16 m) west of the SW corner of the Johnson Storage building, 17
feet (5 m) east of the easternmost rail of the Southern Pacific railroad spur,
and at ground level.
BENCH MARK STAMPING: 2895 A 1982
MONUMENTATION: Survey Disk VM#: 8814
AGENCY: PID#: OA0655
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set flush in the west edge of a concrete pad located between
the two westernmost fuel tanks, south of the Sea Term Services, Inc. yard, 118
feet (36 m) north of the centerline of California Avenue, 34 feet (10 m) south
of the chainlink fence marking the southern boundary of the Sea Term Services
yard, 27.5 feet (8.4 m) east of the south entrance to the yard, and at ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 08/14/1989
Station ID: 9432895 SUPERCEDED DATE: 04/21/2003
Name: NORTH BEND, COOS BAY
OREGON
NOAA Chart: 18587 Latitude: 43° 24.6' N
USGS Quad: NORTH BEND Longitude: 124° 13.1' W
T I D A L D A T U M S
Tidal datums at NORTH BEND, COOS BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: SEPTEMBER 1982
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9432780 CHARLESTON
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/06/1982) = 9.52
MEAN HIGHER HIGH WATER MHHW = 8.42
MEAN HIGH WATER MHW = 7.77
MEAN TIDE LEVEL MTL = 4.54
MEAN LOW WATER MLW = 1.31
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (09/15/1982) = -1.04
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
BENCH MARK NO 3 1960 12.92 5.15
23 1917 27.59 19.82
HLT 6 1965 26.39 18.62
NORTH BEND TIDAL NO 1 1976 16.27 8.50
NORTH BEND TIDAL 2 1976 15.46 7.69
NORTH BEND 4 PORTLAND DIST 1976 15.69 7.92
2895 A 1982 13.77 6.00
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 08/14/1989
Station ID: 9432895 SUPERCEDED DATE: 04/21/2003
Name: NORTH BEND, COOS BAY
OREGON
NOAA Chart: 18587 Latitude: 43° 24.6' N
USGS Quad: NORTH BEND Longitude: 124° 13.1' 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.