U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9445958 PUBLICATION DATE: 07/12/2023
Name: BREMERTON
WA
NOAA Chart: 18449 Latitude: 47° 33.7' N ( 47.56170)
USGS Quad: BREMERTON EAST Longitude: 122° 37.4' W (-122.62300)
To reach the tidal bench marks from the intersection of Burwell St (304) and
Pacific Ave. in Bremerton, proceed 0.19 km (0.12 mi) S along Pacific Ave. to the
Washington State Ferry Terminal Landing. The tidal bench marks are from the
Bremerton Ferry Office to the maintenance shed which houses the tide station
electronics. Most marks are located along the ferry ramps and infrastructure
underneath the elevated departure/arrival deck above. The remote met is located
on the northeast end of the roof of the Kitsap Transit building above the
Washington State Ferry Port.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5958 C 2021
DESIGNATION: 944 5958 C
MONUMENTATION: Tidal Station disk VM#: 23926
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete footing supporting a column OPUS PID:
LATITUDE: 47° 33.8' N ( 47.56269) LONGITUDE: 122° 37.5' W (-122.62483)
The bench mark is set into the top of a concrete footing supporting a column
which supports the arrival/departure deck for pedestrian ferry traffic, 24.1 m
(79.1 ft) south of light pole #12, 7.5 m (24.6 ft) west of light pole #13, 0.23
m (0.8 ft) south of the north column leading up to the stairs for the Bremerton
ferry terminal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9445958 PUBLICATION DATE: 07/12/2023
Name: BREMERTON
WA
NOAA Chart: 18449 Latitude: 47° 33.7' N ( 47.56170)
USGS Quad: BREMERTON EAST Longitude: 122° 37.4' W (-122.62300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5958 B 2021
DESIGNATION: 944 5958 B
MONUMENTATION: Tidal Station disk VM#: 23927
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Curb OPUS PID:
LATITUDE: 47° 33.7' N ( 47.56236) LONGITUDE: 122° 37.5' W (-122.62497)
The mark is set into the top of eastern curb of the road leading to slip #2,
25.5 m (83.7 ft) NW of the vehicle arm for slip #2, 13.2 m (43.3 ft) north of a
large green breaker room, 2.74 m (9.0 ft) south of first light pole of slip #2.
BENCH MARK STAMPING: 5958 A 2021
DESIGNATION: 944 5958 A
MONUMENTATION: Tidal Station disk VM#: 23928
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 47° 33.7' N ( 47.56208) LONGITUDE: 122° 37.5' W (-122.62539)
The mark is set in the top of the threshold of a rollup door for the ferry
terminal maintenance shed, 23.3 m (76.4 ft) SW of a green breaker room, 17.98 m
(59.0 ft) SE of a large white generator, 0.19 m (0.6 ft) NW of the SE side of
the rollup door to the maintenance shed.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9445958 PUBLICATION DATE: 07/12/2023
Name: BREMERTON
WA
NOAA Chart: 18449 Latitude: 47° 33.7' N ( 47.56170)
USGS Quad: BREMERTON EAST Longitude: 122° 37.4' W (-122.62300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5958 D 2021
DESIGNATION: 944 5958 D
MONUMENTATION: Bench Mark disk VM#: 23929
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 47° 33.8' N ( 47.56286) LONGITUDE: 122° 37.5' W (-122.62519)
The mark is set on top of the west barrier wall separating the ferry holding
area from Burwell st., 6.8 m (22.3 ft) SE of a fire hydrant in ferry lane # 13,
4.2 m (13.8 ft) SSW of the centerline of Burwell st., 0.33 m (1.1 ft) south of
the handrail on the barrier and 0.94 m (3.1 ft) above the asphalt holding area.
BENCH MARK STAMPING: 5958 E 2021
DESIGNATION: 944 5958 E
MONUMENTATION: Tidal Station disk VM#: 23930
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 47° 33.8' N ( 47.56333) LONGITUDE: 122° 37.6' W (-122.62589)
The mark is set in the corner of a pedestrian ramp leading from the ferry
holding area to Burwell st., near the ferry terminal office building, 6.05 m
(19.8 ft) SSW of middle the walkway over the Burwell st. Tunnel, 2.7 m (8.9 ft)
south of the south corner of the ferry office building, 0.4 m (1.3 ft) NE of the
corner of the walkway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9445958 PUBLICATION DATE: 07/12/2023
Name: BREMERTON
WA
NOAA Chart: 18449 Latitude: 47° 33.7' N ( 47.56170)
USGS Quad: BREMERTON EAST Longitude: 122° 37.4' W (-122.62300)
T I D A L D A T U M S
Tidal datums at BREMERTON based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: September 2021 - August 2022
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/27/2022) = 4.740
MEAN HIGHER HIGH WATER MHHW = 3.571
MEAN HIGH WATER MHW = 3.298
MEAN TIDE LEVEL MTL = 2.084
MEAN SEA LEVEL MSL = 2.077
MEAN LOW WATER MLW = 0.870
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/29/1998) = -3.628
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5958 C 2021 6.530 3.232
5958 B 2021 5.794 2.496
5958 A 2021 5.506 2.208
5958 D 2021 6.323 3.025
5958 E 2021 10.041 6.743
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9445958 PUBLICATION DATE: 07/12/2023
Name: BREMERTON
WA
NOAA Chart: 18449 Latitude: 47° 33.7' N ( 47.56170)
USGS Quad: BREMERTON EAST Longitude: 122° 37.4' W (-122.62300)
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.