U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9468691 PUBLICATION DATE: 01/06/2011
Name: SHAKTOOLIK
AK
NOAA Chart: 16200 Latitude: 64° 22.8' N ( 64.38022)
USGS Quad: NORTON BAY (B-5) Longitude: 161° 14.1' W (-161.23514)
To reach the bench marks from the Shaktoolik airport maintenance building,
proceed SW 0.1 km (0.1 mi) to the beach adjacent to Norton Sound, then NW 1.24
km (0.8 mi) to where the beach curves right, then NNW 0.26 km (0.2 mi) to where
the beach runs north, then NNE for 0.43 km (0.3 mi) to the end of the beach.
The bench marks are in the grassy area along the east side of the beach. The
tide house was located near the north end of the beach, two sensors were located
in Shaktoolik Bay, and one sensor was located in Norton Sound.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8691 A 2010
DESIGNATION: 946 8691 A
MONUMENTATION: Metal Rod VM#: 19741
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod. OPUS PID#: BBBZ37
LATITUDE: 64° 22.8' N ( 64.37992) LONGITUDE: 161° 14.1' W (-161.23575)
The primary bench mark is set in a grassy shoal near the mouth of the Shaktoolik
Lagoon, 78.65 m (258.0 ft) north of bench mark 946 8691 B, 15.00 m (49.2 ft)
east of vegetation line along the beach, 4.30 m (14.1 ft) west of centerline of
a dirt all terrain vehicle trail, and 0.93 m (3.1 ft) west of an orange
carsonite witness post. The datum point is 11 cm (0.4 ft) below grade being the
top of a stainless steel rod driven 12.1 m (39.7 ft) to refusal and encased in a
6-inch PVC pipe and 13 cm (0.43 ft) below the top of 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: 9468691 PUBLICATION DATE: 01/06/2011
Name: SHAKTOOLIK
AK
NOAA Chart: 16200 Latitude: 64° 22.8' N ( 64.38022)
USGS Quad: NORTON BAY (B-5) Longitude: 161° 14.1' W (-161.23514)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8691 B 2010
DESIGNATION: 946 8691 B
MONUMENTATION: Metal Rod VM#: 19742
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod. OPUS PID:
LATITUDE: 64° 22.7' N ( 64.37917) LONGITUDE: 161° 14.2' W (-161.23592)
The primary bench mark is set in a grassy shoal near the mouth of the Shaktoolik
Lagoon, 78.65 m (258.0 ft) north of benchmark 946 8691 B, 15.00 m (49.2 ft) east
of vegetation line along the beach, 4.30 m (14.1 ft) west of centerline of a
dirt all terrain vehicle trail, and 0.93 m (3.1 ft) west of an orange carsonite
witness post. The datum point is 11 cm (0.4 ft) below grade being the top of a
stainless steel rod driven 12.1 m (39.7 ft) to refusal and encased in a 6-inch
PVC pipe and set 13 cm (0.43 ft) below the top of a 7-inch diameter National
Ocean Service logo.
BENCH MARK STAMPING: 8691 C 2010
DESIGNATION: 946 8691 C
MONUMENTATION: Metal Rod VM#: 19743
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod. OPUS PID#: BBFB35
LATITUDE: 64° 22.7' N ( 64.37856) LONGITUDE: 161° 14.2' W (-161.23600)
The bench mark is set in a grassy shoal near the mouth of the Shaktoolik Lagoon,
72.95 m (239.3 ft) south of benchmark 946 8691 B, 12.40 m (40.7 ft) ESE of SE
corner of navigation aid, 5.10 m (16.7 ft) WSW of centerline of a dirt all
terrain vehicle trail, and 0.95 m (3.1 ft) south of an orange carsonite witness
post. The datum point is 6 cm (0.2 ft) below grade being the top of a stainless
steel rod driven 12.1 m (39.7 ft) to refusal and encased in a 6-inch PVC pipe
and 16 cm (0.5 ft) below the top of a 7-inch diameter Geodetic Survey logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9468691 PUBLICATION DATE: 01/06/2011
Name: SHAKTOOLIK
AK
NOAA Chart: 16200 Latitude: 64° 22.8' N ( 64.38022)
USGS Quad: NORTON BAY (B-5) Longitude: 161° 14.1' W (-161.23514)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8691 D 2010
DESIGNATION: 946 8691 D
MONUMENTATION: Metal Rod VM#: 19744
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod. OPUS PID#: BBFB34
LATITUDE: 64° 22.7' N ( 64.37806) LONGITUDE: 161° 14.2' W (-161.23625)
The bench mark is set in a grassy shoal near the mouth of the Shaktoolik Lagoon,
84.00 m (275.6 ft) ESE of SE corner of navigation aid, 71.45 m (234.4 ft) SE of
benchmark 946 8691 C, 24.30 m (79.7 ft) ENE of vegetation line along the beach,
and 0.87 m (2.9 ft) south of an orange carsonite witness post. The datum point
is the top of a stainless steel rod driven 12.1 m (39.7 ft) to refusal and
encased in a 6-inch PVC pipe and 16 cm (0.5 ft) below the top of a 7-inch
diameter Geodetic Survey logo.
BENCH MARK STAMPING: 8691 E 2010
DESIGNATION: 946 8691 E
MONUMENTATION: Metal Rod VM#: 19745
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod. OPUS PID#: BBFB33
LATITUDE: 64° 22.6' N ( 64.37728) LONGITUDE: 161° 14.1' W (-161.23522)
The bench mark is set in a grassy shoal near the mouth of the Shaktoolik Lagoon,
73.25 m (240.3 ft) SE of benchmark 946 8691 D, 48.9 m (160.4 ft) of storm-debris
gravel bar edge, 17.00 m (55.8 ft) SW of centerline of a dirt all terrain
vehicle trail, and 0.85 m (2.8 ft) south of an orange carsonite witness post.
The datum point is set 2 cm (0.1 ft) below grade being the top of a stainless
steel rod driven 11.0 m (36.1 ft) to refusal and encased in a 6-inch PVC pipe
and 12 cm (0.39 ft) below the top of a 7-inch diameter National Ocean Service
logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9468691 PUBLICATION DATE: 01/06/2011
Name: SHAKTOOLIK
AK
NOAA Chart: 16200 Latitude: 64° 22.8' N ( 64.38022)
USGS Quad: NORTON BAY (B-5) Longitude: 161° 14.1' W (-161.23514)
T I D A L D A T U M S
Tidal datums at SHAKTOOLIK based on:
LENGTH OF SERIES: 40 DAYS
TIME PERIOD: July 15 2010 - August 23 2010
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9468756 NOME, NORTON SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.138
MEAN HIGH WATER MHW = 0.931
MEAN TIDE LEVEL MTL = 0.560
MEAN SEA LEVEL MSL = 0.509
MEAN LOW WATER MLW = 0.190
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8691 A 2010 3.265 2.334
8691 B 2010 3.455 2.524
8691 C 2010 3.657 2.726
8691 D 2010 3.689 2.758
8691 E 2010 3.499 2.568
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9468691 PUBLICATION DATE: 01/06/2011
Name: SHAKTOOLIK
AK
NOAA Chart: 16200 Latitude: 64° 22.8' N ( 64.38022)
USGS Quad: NORTON BAY (B-5) Longitude: 161° 14.1' W (-161.23514)
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.