U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
To reach the tide station from the airport, proceed east on Seppala Drive for
1.0 km (0.6 mi) to the first intersection at the bridge at Jafet Drive, turn
right on Jafet Drive and proceed 0.2 km (0.1 mi) west across the bridge over the
Snake River to the intersection with Port Road, turn left and proceed south on
Port Road 0.6 km (0.4 mi) to the causeway leading to the port and turn left,
proceed south onto the causeway and continue 0.7 km (0.4 mi) to its end. The
tide house is on the right and the orifice assembly is to the left, attached to
the sheet pile. The bench marks are located along Port Road, Jafet Drive,
Seppala Drive and the causeway between the airport to the tide house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BM H
DESIGNATION: 946 8756 H
MONUMENTATION: Flange-encased Rod VM#: 12155
AGENCY: National Geodetic Survey (NGS) IDB PID:
SETTING CLASSIFICATION: Thermopile deep rod OPUS PID#: BBFB37
LATITUDE: 64° 30.4' N ( 64.50664) LONGITUDE: 165° 25.8' W (-165.43011)
The primary bench mark is an Arctic thermopile rod set NE of the entrance to the
Post Office Annex, 24.15 m (79.2 ft) NE of the flag pole in the parking lot,
13.7 m (45 ft) SE of the centerline of Lindblom Drive, 13.5 m (44 ft) SW of the
centerline of Port Road, 8.85 m (29.0 ft) S of the stop sign at the intersection
of Port Road and Lindblom Drive, 6.35 m (20.8 ft) NE of the guard rail in the
parking lot. The bench mark is the top of an Arctic Thermopile rod installed in
a 3.3 m (11 ft) augured hole and back filled with sand slurry and encased in a
6-inch PVC pipe with NGS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8756 E 1992
DESIGNATION: 946 8756 E
MONUMENTATION: Tidal Station disk VM#: 12152
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 64° 30.1' N ( 64.50144) LONGITUDE: 165° 26.0' W (-165.43308)
The bench mark is a disk set in the concrete foundation of a large metal
building at the north end of the causeway at the south end of the southern most
of three garage doors, 26.84 m (88.1ft) west of a fire hydrant, 1.00 m (3.3 ft)
north of the south corner of the building, 0.14m (0.5 ft) west of the east edge
of the foundation and 0.06 m (0.2 ft) north of the south end of the garage door.
BENCH MARK STAMPING: KMJV-1 2006
DESIGNATION: 946 8756 KMJV-1
MONUMENTATION: Tidal Station disk VM#: 18223
AGENCY: US Army Corp of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Post OPUS PID#: BBFB36
LATITUDE: 64° 29.9' N ( 64.49897) LONGITUDE: 165° 26.2' W (-165.43633)
The bench mark is a disk on a post that is welded to the northern most sheet
pile at the NE end of the bridge leading to the causeway, 14.96 m (49.1 ft) east
of the north end of the sheet pile at the NW corner of bridge, 14.02 m (46.0 ft)
north of the gate at the NE corner of the bridge,7.0 m (23 ft) east of the
centerline of the dirt road, 2.73m (9.0 ft) North of a 3m (9.8 ft) tall wooden
sign post and projecting 0.25 m (0.8 ft) above the top of the sheet pile.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8756 M 2016
DESIGNATION: 946 8756 M
MONUMENTATION: Bench Mark disk VM#: 22038
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 64° 29.7' N ( 64.49433) LONGITUDE: 165° 26.4' W (-165.43981)
The bench mark is a disk set near the South end of the causeway in the NE corner
of a 3.20 m (10.5 ft) x 3.20 m (10.5 ft) concrete footing South of three light
poles, 46.27 m (151.8 ft) West of the southernmost of six 0.22 m (0.7 ft) x 1.08
m (3.5 ft) high yellow bollards which protect fuel pipes, 5.3 m (17.4 ft) East
of the East edge of the rock riprap wall, 2.01 m (6.6 ft) South of the SE corner
of a blue lavatory, 0.21 m (0.7 ft) NE of a 0.34 m (1.1 ft) x 1.05 m (3.4 ft)
high yellow bollard the NE most of four bollards which protect the light pole
and 0.07 m (0.2 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8756 N 2016
DESIGNATION: 946 8756 N
MONUMENTATION: Bench Mark disk VM#: 22039
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 64° 29.8' N ( 64.49611) LONGITUDE: 165° 26.3' W (-165.43850)
The bench mark is a disk set near the South end of the causeway in the NE corner
of a 3.15 m (10.3 ft) x 3.15 m (10.3 ft) concrete footing North of three light
poles, 54.69 m (179.4 ft) SSW of a grey 0.60 m (2.0 ft) x 1.01 m (3.3 ft) high
bollard which is North of the North most dock, 8.77 m (28.8 ft) NNE of the NE
corner of a green transformer box, 3.37 m (11.1 ft) ESE of a wooden power pole,
0.14 m (0.5 ft) NE of a 0.33 m (1.1 ft) x 1.27 m (4.2 ft) high yellow bollard
the NE most of four bollards which protect the light pole, 0.14 m (0.5 ft) South
of the North edge of the concrete and 0.14 m (0.5 ft) East of the West edge of
the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 88756 P 2016
DESIGNATION: 946 8756 P
MONUMENTATION: Bench Mark disk VM#: 22040
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete abutment OPUS PID#: BBFM02
LATITUDE: 60° 30.3' N ( 60.50553) LONGITUDE: 165° 25.4' W (-165.42325)
The bench mark is a disk set on the SE bridge abutment for the new bridge which
spans the Snake River, 15.99 m (52.5 ft) West of the stop sign at the
intersection of Seppala Road and Jafet Drive, 15.57 m (51.1 ft) South of a no
fishing from bridge sign, 15.21 m (49.9 ft) NW of a speed limit 25 sign, 1.67 m
(5.5 ft) South of the NE corner of the concrete bridge on the South side of the
pavement, 1.12 m (3.7 ft) North of the South edge of the abutment and 0.44 m
(1.4 ft) West of the East edge of the abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 946 8756 UNSTAMPED
MONUMENTATION: Not specified (see descriptive text) VM#: 22041
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 64° 29.7' N ( 64.49519) LONGITUDE: 165° 26.3' W (-165.43853)
The bench mark is a disk set near the South end of the causeway in the SE corner
of a 3.13 m (10.3 ft) x 3.13 m (10.3 ft) concrete footing for the middle light
of three light poles, 54.69 m (179.4 ft) West of a red fire hydrant on the South
end of the middle sheet pile dock, 4.5 m (14.8 ft) East of the East edge of the
rip rap wall, 4.25 m (13.9 ft) South of the East vertical stanchion for a power
frame, 0.17 m (0.6 ft) SE of a 0.33 m (1.1 ft) x 1.01 m (3.3 ft) high yellow
bollard the SE-most of four bollards which protect the light pole, 0.10 m (0.3
ft) North of the South edge of the concrete, 0.10 m (0.3 ft) West of the East
edge of the concrete and 0.16 m (0.5 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
T I D A L D A T U M S
Tidal datums at NOME, NORTON SOUND based on:
LENGTH OF SERIES: 16 YEARS
TIME PERIOD: 8/97-7/04,'06,9/08-8/10,'11,'13-'16,10/17-9/18
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/19/2004) = 2.973
MEAN HIGHER HIGH WATER MHHW = 0.465
MEAN HIGH WATER MHW = 0.408
MEAN TIDE LEVEL MTL = 0.250
MEAN SEA LEVEL MSL = 0.250
MEAN LOW WATER MLW = 0.092
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.802
LOWEST OBSERVED WATER LEVEL (11/11/2005) = -2.061
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
BM H 3.699 3.291
8756 E 1992 5.041 4.633
KMJV-1 2006 4.998 4.590
8756 M 2016 5.176 4.768
8756 N 2016 5.153 4.745
88756 P 2016 6.064 5.656
946 8756 UNSTAMPED 5.060 4.652
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9468756 PUBLICATION DATE: 12/08/2020
Name: NOME, NORTON SOUND
AK
NOAA Chart: 16206 Latitude: 64° 29.7' N ( 64.49461)
USGS Quad: NOME (C-1) Longitude: 165° 26.4' W (-165.43964)
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.