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Datums Page Page 1 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
To reach the bench marks from the airport in Nome, AK proceed 217.7 km (135.3
mi) SW on a chartered twin engine aircraft to a gravel airstrip at the eastern
end or St. Lawrence Island near Kitnagak Point, proceed 0.4 km (0.2 mi) SE along
a gravel road over the wooden bridge and beyond the saltwater lagoon, then
proceed 1.4 km (0.9 mi) NE to the eastern side of Kitnagak Point. The bench
marks are located along the western shore of Kitnagak Bay. The tide gauge and
sensors are located near tidal bench mark 946 8039 D.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8039 A 2011
DESIGNATION: 946 8039 A
MONUMENTATION: Bench Mark disk VM#: 20126
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID#: BBCK59
LATITUDE: 63° 20.1' N ( 63.33575) LONGITUDE: 168° 56.4' W (-168.94014)
The primary bench mark is a disk set flush in a rock outcrop, 167.94 m (551.0
ft) NE of benchmark 946 8039 C, 69.01 m (226.4 ft) NE of benchmark 946 8039 B,
15.10 m (49.5 ft) ENE of the base of a 1.50 m (4.9 ft) high grassy bluff, and
0.60 m (2.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8039 B 2011
DESIGNATION: 946 8039 B
MONUMENTATION: Bench Mark disk VM#: 20127
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 63° 20.1' N ( 63.33525) LONGITUDE: 168° 56.4' W (-168.94081)
The bench mark is a disk set flush in a rock outcrop near the SE end of the
extent of a rock outcrop, 99.95 m (327.9 ft) NE of benchmark 946 8039 C, 69.01 m
(226.4 ft) SW of benchmark 946 8039 A 2011, 9.20 m (30.2 ft) SE of a 2.00 m (6.6
ft) high grassy bluff, and 0.30 m (1.0 ft) above the gravel beach.
BENCH MARK STAMPING: 8039 C 2011
DESIGNATION: 946 8039 C
MONUMENTATION: Bench Mark disk VM#: 20128
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 63° 20.1' N ( 63.33456) LONGITUDE: 168° 56.5' W (-168.94203)
The bench mark is a disk set flush in a 5.00 m x 1.00 m (16.4 ft x 3.3 ft) rock
outcrop that is 0.40 m (1.3 ft) high and set amongst boulders on the north side
of the boulder patch, 107.00 m (351.0 ft) north of benchmark 946 8039 D, 99.95 m
(327.9 ft) SW of benchmark 946 8039 B, 10.46 m (34.3 ft) E of a 2.00 m (6.6 ft)
high grassy bluff, and 0.40 m (1.3 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8039 D 2011
DESIGNATION: 946 8039 D
MONUMENTATION: Bench Mark disk VM#: 20129
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 63° 20.0' N ( 63.33364) LONGITUDE: 168° 56.5' W (-168.94178)
The bench mark is a disk set flush in a 2.00 m x 0.53 m (6.6 ft x 1.7 ft) rock
outcrop that is 0.38 m (1.2 ft) high and amongst a pile of boulders, 114.30 m
(375.0 ft) north of benchmark 946 8039 E, 107.00 m (351.0 ft) south of benchmark
946 8039 C, 11.18 m (36.7 ft) SE of a 2.00 m (6.6 ft) high grassy beach bluff,
and 0.38 m (1.2 ft) above the ground.
BENCH MARK STAMPING: 8039 E 2011
DESIGNATION: 946 8039 E
MONUMENTATION: Bench Mark disk VM#: 20130
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 63° 20.0' N ( 63.33264) LONGITUDE: 168° 56.5' W (-168.94164)
The bench mark is a disk set flush in a 2.60 m x 1.20 m (8.5 ft x 3.9 ft)
boulder that is 0.40 m (1.3 ft) high and surrounded by mostly smaller boulders,
290.00 m (951.4 ft) north of benchmark 946 8039 TIDAL 4, 114.30 m (375.0 ft)
south of benchmark 946 8039 D, 12.86 m (42.2 ft) east of a 2.00 m (6.6 ft) high
grassy bluff, and 0.40 m (1.3 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1968
DESIGNATION: 946 8039 TIDAL 4
MONUMENTATION: Bench Mark disk VM#: 20131
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 63° 19.8' N ( 63.33008) LONGITUDE: 168° 56.4' W (-168.94036)
The bench mark is an unstamped disk which is heavily beaten and leaning south
set in a 1.92 m x 0.60 m (6.3 ft x 2.0 ft) boulder that is 0.10 m (0.3 ft) high,
505.10 m (1657.1 ft) NW of where the gravel road in the old village meets the
shoreline, 292.00 m (958.0 ft) SE of benchmark 946 8039 E, 13.30 m (43.6 ft) NE
of the grassy beach, 3.16 m (10.4 ft) SE of the high point of a 2.00 m x 1.40 m
x 1.70 m (6.6 ft x 4.6 ft x 5.6 ft) high pyramid shaped boulder, 0.82 m (2.7 ft)
ENE of the eastern point of a 3.30 m x 2.00 m x 0.80 m (10.8 ft x 6.6 ft x 2.6
ft) high boulder that is 0.30 m (1.0 ft) NW of the pyramid shaped boulder, and
0.10 m (0.3 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
T I D A L D A T U M S
Tidal datums at NORTHEAST CAPE, ST. LAWRENCE IS based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: July 2011 - September 2011
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.750
MEAN HIGH WATER MHW = 0.680
MEAN SEA LEVEL MSL = 0.383
MEAN TIDE LEVEL MTL = 0.373
MEAN LOW WATER MLW = 0.066
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8039 A 2011 1.125 0.445
8039 B 2011 0.905 0.225
8039 C 2011 0.750 0.070
8039 D 2011 1.143 0.463
8039 E 2011 0.896 0.216
NO 4 1968 0.591 -0.089
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9468039 PUBLICATION DATE: 11/28/2011
Name: NORTHEAST CAPE, ST. LAWRENCE IS
AK
NOAA Chart: 16006 Latitude: 63° 19.0' N ( 63.31670)
USGS Quad: ST LAWRENCE, AK Longitude: 168° 58.0' W (-168.96700)
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.