U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9469460 PUBLICATION DATE: 05/26/2010
Name: LOPP LAGOON WEST, CAPE PRINCE OF WALES
AK
NOAA Chart: 16005 Latitude: 65° 37.5' N ( 65.62500)
USGS Quad: TELLER (C-7) Longitude: 168° 1.5' W (-168.02500)
To reach the tidal bench marks from the DOT building at the Wales Airstrip,
proceed east on the gravel road towards Tin City for 3.8 km (2.4 mi) to a gravel
wash leading from the road towards the lagoon. The bench marks are located near
the shore. The submersible tide gauge was located 60 m (200 ft) offshore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING:
DESIGNATION: 946 9460 A
MONUMENTATION: Flange-encased Rod VM#: 17419
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBBH55
LATITUDE: 65° 37.5' N ( 65.62500) LONGITUDE: 168° 1.6' W (-168.02700)
The primary bench mark is located in a 0.5 m (2 ft) high tundra hummock 2.5 m (8
ft) in diameter, 82 m (269 ft) NNE (20 magnetic) of the western-most of a pair
of metal culverts underneath the road between Wales and Tin City, 56.37 m (184.9
ft) west (268 magnetic) of bench mark 946 9460 RABAR 2, 30 m (98 ft) south (178
magnetic) of the edge of the lagoon, 20.18 m (66.2 ft) south (178 magnetic) of
bench mark 946 9460 REBAR 1, NNE (13 magnetic) of the large hill behind the
tide station, NNW (346 magnetic) of the eastern-most of a pair of metal
culverts underneath the road between Wales and Tin City, and 2 m (7 ft) above
the water in the lagoon. The bench mark is set 12 cm (0.4 ft) below grade,
being the top of a rounded off stainless steel rod with punch mark driven 3.0 m
(10 ft) to refusal, and encased in a 0.18 m (0.6 ft) diameter NGS Geodetic
Control Mark logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9469460 PUBLICATION DATE: 05/26/2010
Name: LOPP LAGOON WEST, CAPE PRINCE OF WALES
AK
NOAA Chart: 16005 Latitude: 65° 37.5' N ( 65.62500)
USGS Quad: TELLER (C-7) Longitude: 168° 1.5' W (-168.02500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 946 9460 RABAR 1
ALIAS: TBM REBAR 1
MONUMENTATION: Metal Rod VM#: 17420
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Driven into the ground OPUS PID:
LATITUDE: 65° 37.5' N ( 65.62500) LONGITUDE: 168° 1.6' W (-168.02700)
The bench mark is a 0.76 m (2.5 ft) long rebar set in gently sloping tundra, 61
m (200 ft) WNW of bench mark 946 9460 REBAR 2, 20.18 m (66.2 ft) north (358
magnetic) of bench mark 946 9460 A, 10 m (33 ft) south (178 magnetic) of the
edge of the lagoon, and 2 cm (0.1 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9469460 PUBLICATION DATE: 05/26/2010
Name: LOPP LAGOON WEST, CAPE PRINCE OF WALES
AK
NOAA Chart: 16005 Latitude: 65° 37.5' N ( 65.62500)
USGS Quad: TELLER (C-7) Longitude: 168° 1.5' W (-168.02500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 946 9460 RABAR 2
ALIAS: TBM REBAR 2
MONUMENTATION: Metal Rod VM#: 17421
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Driven into the ground OPUS PID:
LATITUDE: 65° 37.5' N ( 65.62500) LONGITUDE: 168° 1.5' W (-168.02500)
The bench mark is a 0.76 m (2.5 ft) long rebar set in gently sloping tundra, 61
m (200 ft) ESE of bench mark 946 9460 REBAR 1, 56.4 m (184.9 ft) east (88
magnetic) of bench mark 946 9460 A, and 1 cm (0.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9469460 PUBLICATION DATE: 05/26/2010
Name: LOPP LAGOON WEST, CAPE PRINCE OF WALES
AK
NOAA Chart: 16005 Latitude: 65° 37.5' N ( 65.62500)
USGS Quad: TELLER (C-7) Longitude: 168° 1.5' W (-168.02500)
T I D A L D A T U M S
Tidal datums at LOPP LAGOON WEST, CAPE PRINCE OF WALES based on:
LENGTH OF SERIES: 1 MONTHS
TIME PERIOD: September 2003 - September 2003
TIDAL EPOCH:
CONTROL TIDE STATION: 9469854 SHISHMAREF INLET 2
Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS:
MEAN SEA LEVEL MSL = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MSL
946 9460 A 3.800
946 9460 RABAR 1 1.994
946 9460 RABAR 2 4.417
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9469460 PUBLICATION DATE: 05/26/2010
Name: LOPP LAGOON WEST, CAPE PRINCE OF WALES
AK
NOAA Chart: 16005 Latitude: 65° 37.5' N ( 65.62500)
USGS Quad: TELLER (C-7) Longitude: 168° 1.5' W (-168.02500)
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.