U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 10/31/1984
Station ID: 9446969 SUPERCEDED DATE: 04/21/2003
Name: OLYMPIA, BUDD INLET
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 3.1' N
USGS Quad: TUMWATER Longitude: 122° 54.2' W
To reach the tidal bench marks from the intersection of Columbia Street and C
Avenue in Olympia, proceed NNW on Columbia Street extension for 0.1 mile (0.2
km) to the extreme SW corner of Port of Olympia Wharf. The bench marks are in
the vicinity of the wharf and the tide gage and staff were located on the Port
of Olympia wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 14 1935
MONUMENTATION: Survey Disk VM#: 9188
AGENCY: PID#: SY0866
SETTING CLASSIFICATION: Concrete Block
The bench mark is set in the top of a concrete block, 0.2 miles (0.3 km) NNW of
the intersection of North Capitol Way and B Avenue at Port of Olympia wharf, 254
feet (77 m) north of the south end of the wharf, 166.5 feet (50.7 m) SSE of the
SE corner of a transit shed, 141 feet (43 m) east of the west edge of the wharf,
137 feet (42 m) south of the SW corner of the port shop building, 136.7 feet (42
m) south of Bench Mark 15 1935 and access to the mark is through a 6-inch pipe
with an 8-inch case iron cover.
BENCH MARK STAMPING: 8 1923
MONUMENTATION: Survey Disk VM#: 9185
AGENCY: PID#: SY0867
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set vertically in the west face of a concrete wall around
Standard Oil Company storage tanks, 260 feet (79 m) north of the north curb of
B Avenue, 3.2 feet (1.0 m) south of the NW corner of the wall, and 2 feet (0.6
m) east of the center of a fire hydrant.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 10/31/1984
Station ID: 9446969 SUPERCEDED DATE: 04/21/2003
Name: OLYMPIA, BUDD INLET
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 3.1' N
USGS Quad: TUMWATER Longitude: 122° 54.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9 1923
MONUMENTATION: Survey Disk VM#: 9186
AGENCY: PID#: SY0868
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set vertically in the north face of a concrete wall around the
Standard Oil Company storage tanks, 260 feet (79 m) north of the north curb of B
Avenue, 31.5 feet (9.6 m) west of the west curb of Capitol Way, 19.0 feet (5.8
m) west of the NE corner of the wall and 4.0 feet (1.2 m) below the top of the
wall.
BENCH MARK STAMPING: 11 1923
MONUMENTATION: Survey Disk VM#: 9187
AGENCY: PID#: SY0869
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set vertically in the east concrete wall of the Olympia Fire
Station building, 69.0 feet (21 m) north of the north curb of the Avenue, 12
feet (4 m) west of the west curb of the Way, 1.8 feet (0.5 m) south of the NE
corner of the building and 1 foot (0.3 m) above ground level.
BENCH MARK STAMPING: 15 1935
MONUMENTATION: Survey Disk VM#: 9189
AGENCY: PID#: SY0865
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the top and 0.5 foot (0.2 m) NE of the SW corner of the
concrete foundation of the shop building, 146.0 feet (44.5 m) east of the east
edge of the wharf, 136.7 feet (41.7 m) north of Bench Mark 14 1935, 61.9 feet
(18.9 m) ESE of the SE corner of a transit shed and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 10/31/1984
Station ID: 9446969 SUPERCEDED DATE: 04/21/2003
Name: OLYMPIA, BUDD INLET
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 3.1' N
USGS Quad: TUMWATER Longitude: 122° 54.2' W
T I D A L D A T U M S
Tidal datums at OLYMPIA, BUDD INLET based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: APRIL 1977 THROUGH MARCH 1978
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 (12/15/1977) = 18.10
MEAN HIGHER HIGH WATER MHHW = 14.56
MEAN HIGH WATER MHW = 13.54
MEAN TIDE LEVEL MTL = 8.30
MEAN LOW WATER MLW = 3.06
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (06/02/1977) = -4.17
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
14 1935 16.73 3.19
8 1923 17.69 4.15
9 1923 17.94 4.40
11 1923 20.02 6.48
15 1935 17.06 3.52
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 10/31/1984
Station ID: 9446969 SUPERCEDED DATE: 04/21/2003
Name: OLYMPIA, BUDD INLET
WASHINGTON
NOAA Chart: 18445 Latitude: 47° 3.1' N
USGS Quad: TUMWATER Longitude: 122° 54.2' 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.