U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 9445441 PUBLICATION DATE: 08/09/2004
Name: LYNCH COVE DOCK
WA
NOAA Chart: 18440 Latitude: 47° 25.1' N ( 47.41830)
USGS Quad: BELFAIR Longitude: 122° 54.0' W (-122.90000)
To reach the tidal bench marks from the intersection of State Highway 3 and 300
in Belfair, Washington, proceed west on Route 300 for 0.08 km (0.05 mi) then
turn left at the Belfair Trading Post and proceed west on Route 300 for 7.4 km
(4.6 mi) to the Port of Allyn pier on the left and a sign for Lynch Cove Dock.
The pier is 3 m (10 ft) east of a green private residence with a rural route No.
301 mailbox. The bench marks are located on the concrete retaining wall at the
end of the pier. The tide gage and staff were located SW corner of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5441 A 1978
DESIGNATION: 944 5441 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9057
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 47° 25.1' N ( 47.41830) LONGITUDE: 122° 54.1' W (-122.90200)
The primary bench mark is a disk set flush in top of a concrete retaining wall
at the end of the pier, 14.94 m (49.0 ft) south of the centerline of State
Highway 300, 12.07 m (39.6 ft) NE of a light pole on the SW corner, 5.85 m (19.2
ft) north of the SE corner, 0.91 m (3.0 ft) south of the NE corner of the dock
retaining wall, set 1.5 m (5 ft) below road surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 9445441 PUBLICATION DATE: 08/09/2004
Name: LYNCH COVE DOCK
WA
NOAA Chart: 18440 Latitude: 47° 25.1' N ( 47.41830)
USGS Quad: BELFAIR Longitude: 122° 54.0' W (-122.90000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5441 B 1978
DESIGNATION: 944 5441 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9058
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 47° 25.1' N ( 47.41830) LONGITUDE: 122° 54.1' W (-122.90200)
The bench mark is a disk set flush in a concrete retaining wall NE of the end of
the pier, 10.15 m (33.3 ft) NE of a light pole on the SW corner of the concrete
retaining wall of the Lynch Cove Dock, 8.93 m (29.3 ft) south of the centerline
of State Highway 300, 2.50 m (8.2 ft) east of the east face of the house on the
west side of the dock, set 1.2 m (4 ft) below the road surface.
BENCH MARK STAMPING: 5441 C 1978
DESIGNATION: 944 5441 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9059
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 47° 25.1' N ( 47.41830) LONGITUDE: 122° 54.1' W (-122.90200)
The bench mark is a disk set flush in a concrete retaining wall at the end of
the pier, 10.49 m (34.4 ft) south of the centerline of State Highway 300, 9.33 m
(30.6 ft) NE of the NE corner, 1.62 m (5.3 ft) west of a short wood guy pole,
and set 1.5 m (5 ft) below the road surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 9445441 PUBLICATION DATE: 08/09/2004
Name: LYNCH COVE DOCK
WA
NOAA Chart: 18440 Latitude: 47° 25.1' N ( 47.41830)
USGS Quad: BELFAIR Longitude: 122° 54.0' W (-122.90000)
T I D A L D A T U M S
Tidal datums at LYNCH COVE DOCK based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: February 1978 - February 1978
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 = 3.690
MEAN HIGH WATER MHW = 3.382
MEAN SEA LEVEL MSL = 2.162
MEAN TIDE LEVEL MTL = 2.158
MEAN LOW WATER MLW = 0.934
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5441 A 1978 4.619 1.237
5441 B 1978 4.745 1.363
5441 C 1978 4.629 1.247
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 9445441 PUBLICATION DATE: 08/09/2004
Name: LYNCH COVE DOCK
WA
NOAA Chart: 18440 Latitude: 47° 25.1' N ( 47.41830)
USGS Quad: BELFAIR Longitude: 122° 54.0' W (-122.90000)
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.