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National Ocean Service
Datums Page Page 1 of 5
Station ID: 9468258 PUBLICATION DATE: 07/14/2014
Name: SAVOONGA,
AK
NOAA Chart: 16006 Latitude: 63° 40.7' N ( 63.67908)
USGS Quad: ST LAWRENCE D-6 Longitude: 170° 32.2' W (-170.53711)
To reach the bench marks from the apron at the Savoonga Airport, proceed WNW 0.4
km (0.25 mi) along a gravel road to the intersection with another gravel road,
turn right and proceed NW 0.2 km (0.12 mi) along the gravel road to the
intersection of Rodney Kinney Road, turn left and proceed 2.7 km (1.7 mi) to a
ramp on the west side of the road, turn right and drive down the ramp to the
tundra proceeding 58 m (190 ft) to the tide station. The bench marks are
located on the tundra at the station and along the rocky shoreline to the north
of the station.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8258 A 2011
DESIGNATION: 946 8258 A
MONUMENTATION: Metal Rod VM#: 20895
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBCN78
LATITUDE: 63° 40.7' N ( 63.67908) LONGITUDE: 170° 32.2' W (-170.53711)
The primary bench mark is set in the open tundra between the Bering Sea and
Rodney Kinney Road, 46.65 m (153.1 ft) west of the road, 44.96 m (147.5 ft) SW
of a ramp to the road, 36.52 m (119.8 ft) east of bench mark 946 8258 B, and
20.50 m (67.2 ft) east of the tundra and rocky beach interface. The datum point
is set below grade, being the top of a stainless steel rod driven 1.73 m (5.7
ft) to refusal, in a sleeve extending to a depth of 0.91 m (3.0 ft) and encased
in a 6-inch PVC pipe with a 7-inch diameter National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9468258 PUBLICATION DATE: 07/14/2014
Name: SAVOONGA,
AK
NOAA Chart: 16006 Latitude: 63° 40.7' N ( 63.67908)
USGS Quad: ST LAWRENCE D-6 Longitude: 170° 32.2' W (-170.53711)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8258 B 2011
DESIGNATION: 946 8258 B
MONUMENTATION: Tidal Station disk VM#: 20896
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 63° 40.7' N ( 63.67908) LONGITUDE: 170° 32.3' W (-170.53786)
The bench mark is a disk set flush in bedrock along the rocky Bering Sea coast,
83.18 m (272.9 ft) west of Rodney Kinney Road, 78.46 m (257.4 ft) SW of a ramp
off of the road, 72.58 m (238.1 ft) SSW of bench mark 946 8258 C, 36.52 m (119.8
ft) west of bench mark 946 8258 A, and 16.65 m (54.6 ft) west of the tundra and
rocky beach interface.
BENCH MARK STAMPING: 8258 C 2011
DESIGNATION: 946 8258 C
MONUMENTATION: Tidal Station disk VM#: 20897
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 63° 40.8' N ( 63.67975) LONGITUDE: 170° 32.3' W (-170.53769)
The bench mark is a disk set flush in bedrock along the rocky Bering Sea coast,
75.07 m (246.3 ft) west of Rodney Kinney Road, 81.06 m (265.9 ft) NW of a ramp
off of the road, 72.58 m (238.1 ft) NNE of bench mark 946 8258 B, 44.07 m (144.6
ft) SSW of bench mark 946 8258 D, and 18.97 m (62.2 ft) west of the tundra and
rocky beach interface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9468258 PUBLICATION DATE: 07/14/2014
Name: SAVOONGA,
AK
NOAA Chart: 16006 Latitude: 63° 40.7' N ( 63.67908)
USGS Quad: ST LAWRENCE D-6 Longitude: 170° 32.2' W (-170.53711)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8258 D 2011
DESIGNATION: 946 8258 D
MONUMENTATION: Tidal Station disk VM#: 20898
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 63° 40.8' N ( 63.68014) LONGITUDE: 170° 32.3' W (-170.53761)
The bench mark is a disk set flush in bedrock along the rocky Bering Sea coast,
291.5 m (956.4 ft) south of bench mark 946 8258 E, 71.62 m (235.0 ft) west of
Rodney Kinney Road, 44.07 m (144.6 ft) NNE of bench mark 946 8258 C, and 14.26 m
(46.8 ft) west of the tundra and rocky beach interface.
BENCH MARK STAMPING: 8258 E 2011
DESIGNATION: 946 8258 E
MONUMENTATION: Tidal Station disk VM#: 20899
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 63° 41.0' N ( 63.68275) LONGITUDE: 170° 32.3' W (-170.53800)
The bench mark is a disk set flush in bedrock along the rocky Bering Sea coast,
291.5 m (956.4 ft) north of bench mark 946 8258 D, 151.98 m (498.6 ft) NW of
Rodney Kinney Road, 143.8 m (471.8 ft) NW of a ramp off of the road, and 13.95 m
(45.8 ft) NW of the tundra and rocky beach interface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9468258 PUBLICATION DATE: 07/14/2014
Name: SAVOONGA,
AK
NOAA Chart: 16006 Latitude: 63° 40.7' N ( 63.67908)
USGS Quad: ST LAWRENCE D-6 Longitude: 170° 32.2' W (-170.53711)
T I D A L D A T U M S
Tidal datums at SAVOONGA, 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 = 0.781
MEAN HIGH WATER MHW = 0.706
MEAN TIDE LEVEL MTL = 0.393
MEAN SEA LEVEL MSL = 0.390
MEAN LOW WATER MLW = 0.079
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8258 A 2011 7.044 6.338
8258 B 2011 1.066 0.360
8258 C 2011 1.113 0.407
8258 D 2011 1.340 0.634
8258 E 2011 1.130 0.424
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9468258 PUBLICATION DATE: 07/14/2014
Name: SAVOONGA,
AK
NOAA Chart: 16006 Latitude: 63° 40.7' N ( 63.67908)
USGS Quad: ST LAWRENCE D-6 Longitude: 170° 32.2' W (-170.53711)
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.