U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 07/12/1984
Station ID: 9445832 SUPERCEDED DATE: 04/21/2003
Name: BROWNSVILLE, PORT ORCHARD, PUGET SOUND
WASHINGTON
NOAA Chart: 18449 Latitude: 47° 38.6' N
USGS Quad: BREMERTON EAST Longitude: 122° 36.9' W
To reach the tidal bench marks proceed 0.1 mile (0.16 km) east from the
intersection of State Highway 303 and Ogle Road, on the east side of
Brownsville, Washington. The bench marks are located in the vicinity of the
Brownsville Marina. The tide gage and staff were located at the Brownsville
Marina.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BM 5 1975
MONUMENTATION: Survey Disk VM#: 9092
AGENCY: PID:
SETTING CLASSIFICATION: Boulder
The bench mark is located north of the Brownsville Marina, in a 6-foot (1.8 m)
long by 3 feet (1.0 m) wide boulder, 182 feet (55.5 m) north along the shoreline
from Bench Mark 5832 A 1980, 10 feet (3.0 m) north of the north face of a boat
house, set 2 feet (0.6 m) above ground level.
BENCH MARK STAMPING: 5832 A 1980
MONUMENTATION: Survey Disk VM#: 9089
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Slab
The bench mark is at the Brownsville Marina, at the SW corner of a 10 feet (3.0
m) square concrete slab, 52.0 feet (15.8 m) SE of the door of the marina retail
store, 25 feet (7.6 m) SW of the foot of the marina pier, and 22 feet (6.7 m)
north of the center of the boat ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 07/12/1984
Station ID: 9445832 SUPERCEDED DATE: 04/21/2003
Name: BROWNSVILLE, PORT ORCHARD, PUGET SOUND
WASHINGTON
NOAA Chart: 18449 Latitude: 47° 38.6' N
USGS Quad: BREMERTON EAST Longitude: 122° 36.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5832 B 1980
MONUMENTATION: Survey Disk VM#: 9090
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is located at the Brownsville Marina in the wedge foundation, at
the base of sliding overhead garage door on the west side of the Brownsville
Marina building, 90 feet (27.4 m) NW of Bench Mark 5832 A 1980, 45 feet (13.7 m)
of a yellow fire hydrant and 13 feet (4.0 m) north of the SW corner of the
building.
BENCH MARK STAMPING: 5832 C 1980
MONUMENTATION: Survey Disk VM#: 9091
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Steps
The bench mark is north of the Brownsville Marina building, 111 feet (33.8 m)
north of Bench Mark 5832 B 1980, 32 feet (9.8 m) east of the centerline of Ogle
Road, on the west side and 2 feet (0.6 m) west of the door of a sewage pumping
station. The bench mark is set into the concrete steps of the sewage pump
station.
BENCH MARK STAMPING: BM 6 1975
MONUMENTATION: Survey Disk VM#: 9093
AGENCY: PID:
SETTING CLASSIFICATION: Foundation
The bench mark is at the junction of State Highway 303 and Ogle Road set in the
top step at the NE corner of the Brownsville Fire Department, Fire District No.
15, Station No. 3 building, 600 feet (182.9 m) west of Bench Mark 5832 A 1980,
34 feet (10.4 m) south of the centerline of the road, and 16 feet (4.9 m) SW of
a fire hydrant.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 07/12/1984
Station ID: 9445832 SUPERCEDED DATE: 04/21/2003
Name: BROWNSVILLE, PORT ORCHARD, PUGET SOUND
WASHINGTON
NOAA Chart: 18449 Latitude: 47° 38.6' N
USGS Quad: BREMERTON EAST Longitude: 122° 36.9' W
T I D A L D A T U M S
Tidal datums at BROWNSVILLE, PORT ORCHARD, PUGET SOUND based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: FEBRUARY 1980
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9447130 SEATTLE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/18/1980) = 14.19
MEAN HIGHER HIGH WATER MHHW = 11.82
MEAN HIGH WATER MHW = 10.95
MEAN TIDE LEVEL MTL = 6.93
MEAN LOW WATER MLW = 2.91
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/16/1980) = -2.76
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
BM 5 1975 12.14 1.19
5832 A 1980 16.48 5.53
5832 B 1980 17.14 6.19
5832 C 1980 23.38 12.43
BM 6 1975 39.44 28.49
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 07/12/1984
Station ID: 9445832 SUPERCEDED DATE: 04/21/2003
Name: BROWNSVILLE, PORT ORCHARD, PUGET SOUND
WASHINGTON
NOAA Chart: 18449 Latitude: 47° 38.6' N
USGS Quad: BREMERTON EAST Longitude: 122° 36.9' 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.