U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
To reach the tidal bench marks from the Kaktovik Post Office on the corner of
6th Avenue and Barter Avenue, proceed NW on Barter Avenue for 0.2 km (0.1 mi),
then turn right on Fourth Avenue and continue NE for 0.2 km (0.1 mi) to the end
of Fourth Avenue and the Sewer Vacuum Lift building on the left. The bench
marks are set in the tundra along the edge of Pipsuk Bight. The tide gauge was
located at the Sewer Vacuum Lift building and the orifice was offshore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9176 A 1981
DESIGNATION: 949 9176 A
MONUMENTATION: Aluminum marker VM#: 15460
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Aluminum alloy rod OPUS PID:
LATITUDE: 70° 7.7' N ( 70.12847) LONGITUDE: 143° 36.2' W (-143.60261)
The primary bench mark is a disk set on a small point of land protruding north
into the Pipsuk Bight ENE of the Sewer Vacuum Lift building, 275.6 m (904 ft)
west of the centerline of the north/south running snow fence, 114.5 m (376 ft)
ENE of bench mark 9499176 E, and 77.48 m (254.2 ft) NE of NGS station STANLEY
(PID TT4704). The bench mark is set 24 cm (0.8 ft) above grade, crimped to an
aluminum rod.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9176 E 2008
DESIGNATION: 949 9176 E
MONUMENTATION: Metal Rod VM#: 18852
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 70° 7.7' N ( 70.12822) LONGITUDE: 143° 36.3' W (-143.60556)
The bench mark is a driven rod set in the tundra east of the Sewer Vacuum Lift
building, 114.5 m (376 ft) WSW of bench mark 9499176 A, 72.05 m (236.4 ft) east
of bench mark 9499176 F, 28.30 m (92.8ft) south of the north edge of vegetation
at the water, and 5.93 m (19.5 ft) SSW of a 0.04 m (0.13ft) diameter aluminum
survey disk on driven re-bar stamped HVL CP9 1981. The bench mark is set 4.5 cm
(0.2 ft) below grade, being the top of a stainless steel rod driven 4.9 m (16
ft) to refusal and encased in 6 inch NOS logo cap.
BENCH MARK STAMPING: 9176 F 2008
DESIGNATION: 949 9176 F
MONUMENTATION: Metal Rod VM#: 18853
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBBG90
LATITUDE: 70° 7.7' N ( 70.12817) LONGITUDE: 143° 36.4' W (-143.60739)
The bench mark is a driven rod set in the tundra ESE of the Sewer Vacuum Lift
building, 109.3 m (359 ft) NE of the top of the bank on the northern edge of
Pipsuk Avenue at the intersection of 5th Street, 73.02 m (239.6ft) east of bench
mark 949 9176 G, 72.05 m (236.4ft) west of bench mark 949 9176 E, and 31.49 m
(103.3ft) south of the north edge of vegetation at the water. The bench mark is
set 4 cm (0.2 ft) below grade, being the top of a stainless steel rod driven 8.5
m (28 ft) to refusal and encased in a 6-inch diameter NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9176 G 2008
DESIGNATION: 949 9176 G
MONUMENTATION: Metal Rod VM#: 18854
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 70° 7.7' N ( 70.12828) LONGITUDE: 143° 36.6' W (-143.60933)
The bench mark is a driven rod set in the tundra east of the Sewer Vacuum Lift
building. 73.02 m (239.6ft) west of bench mark 949 9176 F, 68.44 m (224.5ft) SE
of bench mark 949 9176 H, 63.82 m (209.4ft) ESE of the NE corner of the Sewer
Vacuum Lift building, 60.13 m (197.3ft) NE of the centerline of Pipsuk Avenue,
and 41.72 m (136.9ft) SW of the north edge of vegetation at the water. The bench
mark is set 3 cm (0.1 ft) below grade, being the top of a stainless steel rod
driven 4.9 m (16 ft) to refusal and encased in a 6-inch diameter NOS logo cover.
BENCH MARK STAMPING: 9176 H 2008
DESIGNATION: 949 9176 H
MONUMENTATION: Metal Rod VM#: 18855
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 70° 7.7' N ( 70.12872) LONGITUDE: 143° 36.6' W (-143.61053)
The bench mark is a driven rod set in the tundra NE of the Sewer Vacuum Lift
building, 68.44 m (224.5 ft) NW of bench mark 949 9176 G, 28.45 m (93.3ft) NW of
the centerline of 4th Street, 20.84 m (68.4ft) SW of the edge of vegetation at
waterline, 20.58 m (67.5ft) NE of the NW corner of the Sewer Vacuum Lift
building. The bench mark is set 2 cm (0.1 ft) below grade, being the top of a
stainless steel rod driven 4.9 m (16 ft) to refusal and encased in 6-inch
diameter NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9176 J 2008
DESIGNATION: 949 9176 J
MONUMENTATION: Metal Rod VM#: 18856
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 70° 8.1' N ( 70.13531) LONGITUDE: 143° 35.3' W (-143.58750)
The bench mark is driven rod set at the bottom of a gravel bank ESE of the
airplane hanger on the north side of the airstrip, 125.4 m (411 ft) north of a
row of white lights that mark the north edge of the airstrip, 52.74 m (173ft)
ESE of the SE corner of the hanger, 49.30 m (161.7ft) south of temporary bench
mark 949 9176 TEMP 1, 25.62 m (84.1ft) west of temporary bench mark 949 9176
TEMP 2, and 14.26 m (46.8ft) SW of the centerline of the row of erosion
abatement barrels buried in the beach. The bench mark is set 4 cm (0.1 ft)
below grade, being the top of a stainless steel rod driven 3.0 m (10 ft) to
refusal and encased in a 6-inch diameter NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TEMP 1
DESIGNATION: 949 9176 TEMP 1
MONUMENTATION: Aluminum marker VM#: 18857
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: 5/8-inch rebar OPUS PID:
LATITUDE: 70° 8.2' N ( 70.13583) LONGITUDE: 143° 35.3' W (-143.58789)
The bench mark is set in the gravel beach along the row of buried erosion
abatement barrels east of the airplane hanger and north of the airstrip, 49.30 m
(161.8 ft) ENE of the NE corner of the hanger, 49.30 m (161.8 ft) north of bench
mark 949 9176 J, and 1.56 m (5.1 ft) SW of the centerline of the row of erosion
abatement barrels buried in the beach. The bench mark is set flush with grade,
being the top of a 4 cm (0.13ft) diameter aluminum disk attached to 5/8-inch
rebar driven 1.2 m (4 ft) into the beach.
BENCH MARK STAMPING: TEMP 2
DESIGNATION: 949 9176 TEMP 2
MONUMENTATION: Aluminum marker VM#: 18858
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: 5/8-inch rebar OPUS PID:
LATITUDE: 70° 8.1' N ( 70.13533) LONGITUDE: 143° 35.2' W (-143.58700)
The bench mark is set in the gravel beach along the row of buried erosion
abatement barrels east of the airplane hanger and north of the airstrip, 76.97 m
(252.5ft) ESE of the SE corner of the hanger, 25.62 m (84.1ft) east of bench
mark 949 9176 J, and 1.00 m (3.3ft) SW of the centerline of the row of erosion
abatement barrels buried in the beach. The bench mark is set flush with grade,
being the top of a 4 cm (0.1 ft) aluminum disk attached to 5/8-inch rebar driven
1.2 m (4 ft) into beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
T I D A L D A T U M S
Tidal datums at BARTER ISLAND, ARCTIC based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: September 2008 - September 2008
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9497645 PRUDHOE BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.184
MEAN HIGH WATER MHW = 0.151
MEAN SEA LEVEL MSL = 0.085
MEAN TIDE LEVEL MTL = 0.080
MEAN LOW WATER MLW = 0.009
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9176 A 1981 1.526 1.375
9176 E 2008 1.685 1.534
9176 F 2008 2.046 1.895
9176 G 2008 2.923 2.772
9176 H 2008 2.515 2.364
9176 J 2008 1.401 1.250
TEMP 1 1.130 0.979
TEMP 2 1.398 1.247
Foot Notes:
Bench marks 9176 J 2008 and TEMP 2 are based on one differential leveling
connection and do not meet the quality control standards of the NOS. Therefore,
caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9499176 PUBLICATION DATE: 03/10/2011
Name: BARTER ISLAND, ARCTIC
AK
NOAA Chart: 16043 Latitude: 70° 7.7' N ( 70.12856)
USGS Quad: BARTER ISLAND (A-5) Longitude: 143° 36.7' W (-143.61103)
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.