U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 04/02/2003
Station ID: 9445133 SUPERCEDED DATE: 04/21/2003
Name: BANGOR
WASHINGTON
NOAA Chart: 18477 Latitude: 47° 44.9' N
USGS Quad: POULSBO Longitude: 122° 43.6' W
To reach the tidal bench marks from Silverdale, proceed north on Clear Creek
Road to Gate #10 of the U.S. Navy Torpedo Station, Bangor Annex, turn left and
travel west through the gate on Tinian Road to the Marginal Wharf. The bench
marks are located at the Torpedo Station in the area around the Marginal Wharf.
The tide gage was located towards the land end of the L shaped Marginal Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1 1946
DESIGNATION: 944 5133 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 11360
AGENCY: US Coast & Geodetic Survey (USC&GS) PID#: SY0959
SETTING CLASSIFICATION: Concrete curb
The primary bench mark is a disk set in top of a concrete curb on the north side
of a small concrete bridge at the east approach to the Marginal wharf and near
the SE corner of Building 177, 2.75 m (9.0 ft) west of the SW corner of Building
# 7159, 2.62 m (8.6 ft) SE of SE corner of Building # 7177, and 0.30 m (1 ft)
east of the west edge of the curb on north side of ramp to the wharf.
BENCH MARK STAMPING: 2 1969
DESIGNATION: 944 5133 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 11361
AGENCY: US Coast & Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of a concrete seawall 49 m (160 ft)
north of the NE corner of the small concrete bridge at the east approach to the
Marginal wharf, at the 2nd bend of the seawall, 12 m (40 ft) NW of a fire
hydrant, and 10 m (33 ft) NW of NW edge of a 0.91m x 1.22 m (3.0 ft x 4.0 ft)
concrete pad for a small transformer.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 04/02/2003
Station ID: 9445133 SUPERCEDED DATE: 04/21/2003
Name: BANGOR
WASHINGTON
NOAA Chart: 18477 Latitude: 47° 44.9' N
USGS Quad: POULSBO Longitude: 122° 43.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3 1969
DESIGNATION: 944 5133 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 11362
AGENCY: US Coast & Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete foundation
The bench mark is a disk set in top of the south edge of a 1 m x 1 m (2 ft x 3
ft) foundation near the SW corner of Building # 191 near the approach to the
Marginal wharf, 30 m (98 ft) east of bench mark 2 1969, 9.1 m (29.8 ft) SE of
north corner of a large transformer pad, and 2.13 m (7.0 ft) NNW of a water
valve manifold.
BENCH MARK STAMPING: 5133 F 1977
DESIGNATION: 944 5133 F
MONUMENTATION: Tidal Station disk VM#: 11363
AGENCY: US Coast & Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in top of a concrete seawall, just south of the
approach to the Marginal wharf, 30 m (100 ft) south of bench mark 1 1946, 18 m
(59 ft) south of the SE edge of a small concrete bridge at the east approach to
the Marginal wharf, and 3 m (10 ft) west of Building # 7163.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 04/02/2003
Station ID: 9445133 SUPERCEDED DATE: 04/21/2003
Name: BANGOR
WASHINGTON
NOAA Chart: 18477 Latitude: 47° 44.9' N
USGS Quad: POULSBO Longitude: 122° 43.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5133 G 1977
DESIGNATION: 944 5133 G
MONUMENTATION: Tidal Station disk VM#: 11364
AGENCY: US Coast & Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in top of a concrete seawall, 43 m (140 ft) south
of the SE edge of a small concrete bridge at the east approach to the Marginal
wharf, and 10.23 m (33.7 ft) west of Building # 7163, and 0.12 m (0.4 ft) west
of the east edge of seawall.
BENCH MARK STAMPING: WHARF 1963 NO 3 1971
DESIGNATION: 944 5133 WHARF NO 3
MONUMENTATION: Tidal Station disk VM#: 16416
AGENCY: US Coast & Geodetic Survey (USC&GS) PID#: AJ2363
SETTING CLASSIFICATION: Concrete wharf deck
The bench mark is a disk set in the concrete deck on the west side of Marginal
wharf, 12.4 m (40.7 ft) north of radar stanchion, 1.50 m (4.9 ft) west of the
west crane rail on the wharf, and 0.80 m (2.6 ft) east of west face of the
wharf.
BENCH MARK STAMPING: MWS OSS 1987
DESIGNATION: 944 5133 MWS OSS
MONUMENTATION: Bench Mark disk VM#: 16417
AGENCY: National Imagery and Mapping Agency (NIMA) PID:
SETTING CLASSIFICATION: Concrete wharf deck
The bench mark is a disk set in the concrete deck on the west side of Marginal
wharf, 22.50 m (73.8 ft) south of 3rd light from SE end of wharf, 15.1 m (49.5
ft) NW of 3rd bollard from SE end of wharf, and 1.07 m (3.5 ft) from seaward
face of pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 04/02/2003
Station ID: 9445133 SUPERCEDED DATE: 04/21/2003
Name: BANGOR
WASHINGTON
NOAA Chart: 18477 Latitude: 47° 44.9' N
USGS Quad: POULSBO Longitude: 122° 43.6' W
T I D A L D A T U M S
Tidal datums at BANGOR based on:
LENGTH OF SERIES: 24 MONTHS
TIME PERIOD: February 2001 - January 2003
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/15/1977) = 4.462
MEAN HIGHER HIGH WATER MHHW = 3.372
MEAN HIGH WATER MHW = 3.104
MEAN TIDE LEVEL MTL = 1.990
MEAN SEA LEVEL MSL = 1.977
MEAN LOW WATER MLW = 0.877
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (06/30/1977) = -1.165
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1 1946 5.178 2.074
2 1969 4.744 1.640
3 1969 5.040 1.936
5133 F 1977 4.713 1.609
5133 G 1977 4.712 1.608
WHARF 1963 NO 3 1971 6.037 2.933
MWS OSS 1987 6.045 2.941
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 04/02/2003
Station ID: 9445133 SUPERCEDED DATE: 04/21/2003
Name: BANGOR
WASHINGTON
NOAA Chart: 18477 Latitude: 47° 44.9' N
USGS Quad: POULSBO Longitude: 122° 43.6' 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.