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National Ocean Service
Datums Page Page 1 of 5
Station ID: 9440691 PUBLICATION DATE: 01/05/2010
Name: NASELLE RIVER SWING BRIDGE
WA
NOAA Chart: 18504 Latitude: 46° 25.8' N ( 46.43000)
USGS Quad: LONG ISLAND Longitude: 123° 54.2' W (-123.90300)
To reach the tidal bench marks from Naselle, proceed west along State Highway 4
for about 8 km (5 mi) to U.S. Highway 101, then south on U.S. Highway 101 for 8
km (5 mi) to Naselle River Swing Bridge. The bench marks are along Parpala Road.
The tide gage and staff were on the east side of the center span of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0691 A 1982
DESIGNATION: 944 0691 A
MONUMENTATION: Tidal Station disk VM#: 8950
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Aluminum pipe OPUS PID:
LATITUDE: 46° 25.0' N ( 46.41670) LONGITUDE: 123° 54.0' W (-123.90000)
The primary bench mark is a disk set atop an aluminum pipe encased in a PVC pipe
located east of the south end of Naselle River Swing Bridge, inside the
guardrail, 19 m (61 ft) north of the cliff face, 12 m (38 ft) NNE of the
centerline of Parpala Road, 10 m (33 ft) SE of the centerline of the bridge
(U.S. Highway 101), 3 m (9 ft) south of the river bank, 0.76 m (2.5 ft) NNW of
the east guardrail, and 0.03 m (0.1 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9440691 PUBLICATION DATE: 01/05/2010
Name: NASELLE RIVER SWING BRIDGE
WA
NOAA Chart: 18504 Latitude: 46° 25.8' N ( 46.43000)
USGS Quad: LONG ISLAND Longitude: 123° 54.2' W (-123.90300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0691 B 1982
DESIGNATION: 944 0691 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 8951
AGENCY: National Ocean Survey (NOS) IDB PID#: SC2840
SETTING CLASSIFICATION: Aluminum pipe OPUS PID:
LATITUDE: 46° 26.0' N ( 46.43330) LONGITUDE: 123° 54.1' W (-123.90200)
The bench mark is a disk set atop an aluminum pipe encased in a PVC pipe north
of Parpala Road, SE of Naselle River Swing Bridge, 82 m (270 ft) east of bench
mark 0691 A 1982, 44 m (145 ft) NNW of bench mark 0691 C 1982, 16 m (52 ft)
north of the centerline of Parpala Road, 8 m (25 ft) south of the river
shoreline, 5.33 m (17.5 ft) east of utility pole # J26, 2 m (5 ft) south of a
deciduous tree, and 0.03 m (0.1 ft) below ground level.
BENCH MARK STAMPING: 0691 C 1982
DESIGNATION: 944 0691 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 8952
AGENCY: National Ocean Survey (NOS) IDB PID#: SC2839
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 46° 26.0' N ( 46.43330) LONGITUDE: 123° 54.1' W (-123.90200)
The bench mark is a disk set flush in the NE corner of a concrete footing of the
Washington State Department of Transportation storage building, SE of Naselle
River Swing Bridge, 19 m (62 ft) NW of the NW footing of a large elevated oil
tank, and 17 m (57 ft) south of the centerline of Parpala Road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9440691 PUBLICATION DATE: 01/05/2010
Name: NASELLE RIVER SWING BRIDGE
WA
NOAA Chart: 18504 Latitude: 46° 25.8' N ( 46.43000)
USGS Quad: LONG ISLAND Longitude: 123° 54.2' W (-123.90300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0691 D 1982
DESIGNATION: 944 0691 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 8953
AGENCY: National Ocean Survey (NOS) IDB PID#: SC2841
SETTING CLASSIFICATION: Aluminum pipe OPUS PID:
LATITUDE: 46° 26.0' N ( 46.43330) LONGITUDE: 123° 54.1' W (-123.90200)
The bench mark is a disk set atop an aluminum pipe encased in a PVC pipe south
of Parpala Road, SE of the Naselle River Swing Bridge, 55 m (180 ft) east of the
NE corner of the Washington State Department of Transportation storage building,
22.71 m (74.5 ft) south of utility pole J22-9 on the north side of Parpala Road,
7.83 m (25.7 ft) SSW of the centerline of Parpala Road, 4 m (13 ft) east of the
centerline of an abandoned logging road, and 0.03 m (0.1 ft) below ground level.
BENCH MARK STAMPING: 0691 E 1982
DESIGNATION: 944 0691 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 8954
AGENCY: National Ocean Survey (NOS) IDB PID#: SC1021
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 46° 25.7' N ( 46.42830) LONGITUDE: 123° 54.3' W (-123.90500)
The bench mark is a disk set flush in an abandoned 12 m x 21 m (39 ft x 68 ft)
concrete pad on the south side of Parpala Road, SE of Naselle River Swing
Bridge, 42 m (137 ft) south of the centerline of Parpala Road, 21 m (69 ft) east
of the easternmost abandoned trestle west of the concrete pad, 6.86 m (22.5 ft)
SW of an abandoned transformer stand east of the pad, 2 m (6 ft) west of the
east edge of the pad, and 1 m (2 ft) south of the south edge of a trough in the
pad which is 7 m (24 ft) south of the north end of the pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9440691 PUBLICATION DATE: 01/05/2010
Name: NASELLE RIVER SWING BRIDGE
WA
NOAA Chart: 18504 Latitude: 46° 25.8' N ( 46.43000)
USGS Quad: LONG ISLAND Longitude: 123° 54.2' W (-123.90300)
T I D A L D A T U M S
Tidal datums at NASELLE RIVER SWING BRIDGE based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: May 1982 - June 1982
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9440910 TOKE POINT, WILLAPA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.267
MEAN HIGH WATER MHW = 3.036
MEAN SEA LEVEL MSL = 1.805
MEAN TIDE LEVEL MTL = 1.743
MEAN LOW WATER MLW = 0.451
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0691 A 1982 5.247 2.212
0691 B 1982 4.050 1.015
0691 C 1982 4.572 1.537
0691 D 1982 4.460 1.424
0691 E 1982 4.504 1.468
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9440691 PUBLICATION DATE: 01/05/2010
Name: NASELLE RIVER SWING BRIDGE
WA
NOAA Chart: 18504 Latitude: 46° 25.8' N ( 46.43000)
USGS Quad: LONG ISLAND Longitude: 123° 54.2' W (-123.90300)
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.