U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9445526 PUBLICATION DATE: 08/09/2004
Name: HANSVILLE
WA
NOAA Chart: 18441 Latitude: 47° 55.1' N ( 47.91830)
USGS Quad: HANSVILLE Longitude: 122° 32.7' W (-122.54500)
To reach the tidal bench marks from the intersection of Hansville Road and NE
Twin Spits Road in the village of Hansville, proceed east for 61 m (200 ft) to
Forbes Landing and Restaurant and continue to the extreme east end of the pier
extending into Puget Sound at the Landing. The bench marks are located in the
area between Hansville Road and the pier. The tide gage and staff were located
at the east end of the Forbes Landing Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5526 D 1977
DESIGNATION: 944 5526 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9068
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: 47° 55.1' N ( 47.91830) LONGITUDE: 122° 32.7' W (-122.54500)
The primary bench mark is a disk set flush in the top SW corner of a concrete
head wall on the east side of a drainage ditch parallel to Hansville Road, 11 m
(35 ft) east of the centerline of Hansville Road, 5.64 m (18.5 ft) east of a
street sign designating the intersection of Hansville Road and NE Twin Spits
Road, 1.68 m (5.5 ft) north of a power pole and east across Hansville Road from
Volunteer Fire House Station #14.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9445526 PUBLICATION DATE: 08/09/2004
Name: HANSVILLE
WA
NOAA Chart: 18441 Latitude: 47° 55.1' N ( 47.91830)
USGS Quad: HANSVILLE Longitude: 122° 32.7' W (-122.54500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 1 1966
DESIGNATION: 944 5526 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 9065
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete pier OPUS PID:
LATITUDE: 47° 55.1' N ( 47.91830) LONGITUDE: 122° 32.7' W (-122.54500)
The bench mark is a disk set flush in the southern tip of the concrete pier at
the SW corner of a building marked Standard Marine Products, and 1 m (3 ft) NW
of a Chevron gasoline tank.
BENCH MARK STAMPING: BM 2 RESET 1968
DESIGNATION: 944 5526 TIDAL 2 RESET
MONUMENTATION: Tidal Station disk VM#: 9066
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 47° 55.1' N ( 47.91830) LONGITUDE: 122° 32.7' W (-122.54500)
The bench mark is a disk set in the southern corner of a concrete base for a gas
pump island, in front of the Hansville Post Office located in Ericksons General
Store, across the street and 46 m (150 ft) NE of the fire station.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9445526 PUBLICATION DATE: 08/09/2004
Name: HANSVILLE
WA
NOAA Chart: 18441 Latitude: 47° 55.1' N ( 47.91830)
USGS Quad: HANSVILLE Longitude: 122° 32.7' W (-122.54500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 3 1966
DESIGNATION: 944 5526 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 9067
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 47° 55.1' N ( 47.91830) LONGITUDE: 122° 32.7' W (-122.54500)
The bench mark is a disk set flush in the southern tip of Forbes Landing and
Restaurant, directly beneath the sign for the restaurant, and 5 m (15 ft) NE of
a white metal tank.
BENCH MARK STAMPING: 5526 E 1977
DESIGNATION: 944 5526 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9069
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 47° 55.1' N ( 47.91830) LONGITUDE: 122° 32.7' W (-122.54500)
The bench mark is a disk set flush in the concrete sidewalk at the front
entrance alcove of the Hansville Community Church, 46 m (150 ft) NW of the
intersection of Hansville Road and NE Twin Spits Road, 15.70 m (51.5 ft) SW of
the centerline of Twin Spits Road and in the extreme NW corner of the church
entrance.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9445526 PUBLICATION DATE: 08/09/2004
Name: HANSVILLE
WA
NOAA Chart: 18441 Latitude: 47° 55.1' N ( 47.91830)
USGS Quad: HANSVILLE Longitude: 122° 32.7' W (-122.54500)
T I D A L D A T U M S
Tidal datums at HANSVILLE based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: July 1977 - November 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.180
MEAN HIGH WATER MHW = 2.922
MEAN TIDE LEVEL MTL = 1.881
MEAN SEA LEVEL MSL = 1.845
MEAN LOW WATER MLW = 0.841
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5526 D 1977 3.756 0.834
BM 1 1966 3.952 1.030
BM 2 RESET 1968 4.148 1.226
BM 3 1966 4.116 1.194
5526 E 1977 3.986 1.064
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9445526 PUBLICATION DATE: 08/09/2004
Name: HANSVILLE
WA
NOAA Chart: 18441 Latitude: 47° 55.1' N ( 47.91830)
USGS Quad: HANSVILLE Longitude: 122° 32.7' W (-122.54500)
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.