U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
To reach the tidal bench marks from the boat launch NW of the village of Point
Lay, proceed by boat 1.25 mi (2.07 km) WSW on the lagoon to the northern point
of the barrier island west of the new village of Point Lay and south of the
historical village location. The bench marks are located west and south of the
tide station along the base of the small grassy hills.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3300 B 2008
DESIGNATION: 949 3300 B
MONUMENTATION: Tidal Station disk VM#: 18792
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBBG54
LATITUDE: 69° 44.7' N ( 69.74495) LONGITUDE: 163° 3.9' W (-163.06521)
The primary bench mark is set 72.93 m (239.3 ft) north of bench mark 949 3300 C,
51.43 m (168.7 ft) WNW of bench mark 949 3300 A, and 9.21 m (30.2 ft) east of
the crest of a small grassy hill. The bench mark is set 0.03 m (0.1 ft) below
grade, being the top of a stainless steel rod driven 3.63 m (11.9 ft) to
refusal, and encased in an 8-inch PVC pipe with NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3300 A 2008
DESIGNATION: 949 3300 A
MONUMENTATION: Tidal Station disk VM#: 18791
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 69° 44.7' N ( 69.74481) LONGITUDE: 163° 3.8' W (-163.06394)
The bench mark is set 84.16 m (276.1 ft) NE of bench mark 949 3300 C, 51.43 m
(168.7 ft) ESE of bench mark 949 3300 B, and 3.65 m (12.0 ft) west of the beach
and grass interface along the lagoon. The bench mark is set 0.06 m (0.2 ft)
below grade, being the top of a stainless steel rod driven 3.14 m (10.3 ft) to
refusal, and encased in an 8-inch PVC pipe with NOS logo cover.
BENCH MARK STAMPING: 3300 C 2008
DESIGNATION: 949 3300 C
MONUMENTATION: Tidal Station disk VM#: 18793
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 69° 44.7' N ( 69.74431) LONGITUDE: 163° 3.9' W (-163.06557)
The bench mark is set 94.28 m (309.3 ft) NNE of bench mark 949 3300 D, 84.16 m
(276.1 ft) SW of bench mark 949 3300 A, 72.93 m (239.3 ft) south of bench mark
949 3300 B, 51.9 m (170.3 ft) west of the top of beach berm along the lagoon,
and 11.15 m (36.6 ft) east of the crest of a small grassy hill along the
oceanside beach. The bench mark is set 0.06 m (0.2 ft) below grade, being the
top of a stainless steel rod driven 2.22 m (7.3 ft) to refusal, and encased in
an 8-inch PVC pipe with NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3300 D 2008
DESIGNATION: 949 3300 D
MONUMENTATION: Tidal Station disk VM#: 18794
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 69° 44.6' N ( 69.74349) LONGITUDE: 163° 4.0' W (-163.06621)
The bench mark is set 95.45 m (313.2 ft) north of bench mark 949 3300 E, 94.28 m
(309.3 ft) SSW of bench mark 949 3300 C, 56.4 m (185.0 ft) west of the top of
beach berm along the lagoon, and 12.15 m (39.9 ft) east of the crest of a small
grassy hill. The bench mark is set 0.09 m (0.3 ft) below grade, being the top
of a stainless steel rod driven 2.01 m (6.6 ft) to refusal, and encased in an
8-inch PVC pipe with NOS logo cover.
BENCH MARK STAMPING: 3300 E 2008
DESIGNATION: 949 3300 E
MONUMENTATION: Tidal Station disk VM#: 18795
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 69° 44.6' N ( 69.74264) LONGITUDE: 163° 4.0' W (-163.06650)
The bench mark is set 98.72 m (323.9 ft) north of bench mark 949 3300 F, 95.45 m
(313.2 ft) south of bench mark 949 3300 D, 72.30 m (237.2 ft) NW of the edge of
vegetation along the smaller and northern most of two ponds, and 27.7 m (90.9
ft) east of the edge of vegetation along the ocean side beach. The bench mark
is set 0.05 m (0.2 ft) below grade, being the top of a stainless steel rod
driven 2.16 m (7.1 ft) to refusal, and encased in an 8-inch PVC pipe with NOS
logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3300 F 2008
DESIGNATION: 949 3300 F
MONUMENTATION: Tidal Station disk VM#: 18851
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 69° 44.5' N ( 69.74178) LONGITUDE: 163° 4.0' W (-163.06694)
The bench mark is set 98.72 m (323.9 ft) south of bench mark 949 3300 E, 43.2 m
(141.7 ft) WNW of the edge of vegetation aroud a pond, and 34.1 m (111.9 ft)
east of the edge of vegetation along the ocean side beach. The bench mark is
set 0.15 m (0.5 ft) below grade, being the top of a stainless steel rod driven
1.92 m (6.3 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
T I D A L D A T U M S
Tidal datums at POINT LAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: August 2008 - September 2008
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS:
MEAN SEA LEVEL MSL = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MSL
3300 B 2008 3.403
3300 A 2008 1.639
3300 C 2008 3.619
3300 D 2008 3.244
3300 E 2008 3.447
3300 F 2008 3.095
Foot Notes:
Bench mark 3300 F 2008 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9493300 PUBLICATION DATE: 03/18/2011
Name: POINT LAY
AK
NOAA Chart: 16005 Latitude: 69° 44.7' N ( 69.74472)
USGS Quad: POINT LAY (D-2) Longitude: 163° 3.9' W (-163.06417)
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.