U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
To reach the tidal bench marks from Yakutat via boat, proceed NNW out of Yakutat
Bay for 107 km (58 nm) NNW to Icy Bay, pass Tsimpshian Point on Riou Spit, then
proceed 7.5 km (4.1 nm) NE, then east 4.6 km (2.5 nm) east to the western most
point of a land south of Gull Island and east of Moraine Island. The bench
marks are located on both sides of the western most point of land. The tide
station was located at the top of the beach, just south of the point.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3443 F 2002
DESIGNATION: 945 3443 F
MONUMENTATION: Tidal Station disk VM#: 16889
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The primary bench mark is set in the center of a grassy field, 351 m (1152 ft)
SE (137.16 true) from bench mark 3443 E 2002, 68.21 m (223.8 ft) SE from a WWII
era truck at the north edge of the field, and 16.00 m (52.5 ft) ENE from the
seaward edge of the field and of the beginning of the sand and stone beach. The
datum point is set 0.10 m (0.3 ft) below ground, being the top of a 9/16"
stainless steel rod with a rounded top and punchmark in the center, driven 7.3 m
(24 ft) to refusal, and encased in a 5-inch PVC pipe with NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3443 A 1979
DESIGNATION: 945 3443 A
MONUMENTATION: Tidal Station disk VM#: 14533
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a disk set in the SW half of the top of the eastern most of
two large boulders which are 4 m x 4 m x 2.3 m (13 ft x 13 ft x 7 ft) high, 324
m (1063 ft) SSW (206.44 true) from bench mark 3443 C 1979, 154 m (505 ft) SW
(236.93 true) from bench mark 3443 D 2002, 80.15 m (263.0 ft) NE (34.12 true)
from bench mark 3443 E 2002, 21.06 m (69.1 ft) NW from the toe of a 10 m (33 ft)
high bluff, and flush with the surface of the rock. The bench mark is inclined
aproximately 15 degrees southwesterly and the boulder is unstable and appears to
have tipped.
BENCH MARK STAMPING: 3443 C 1979
DESIGNATION: 945 3443 C
MONUMENTATION: Tidal Station disk VM#: 14535
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a disk set on the west edge of a 3 m x 1.2 m x 2 m (10 ft x 4
ft x 6 ft) high flat topped black boulder, 404 m (1325 ft) NNE (27.96 true)
from bench mark 3443 E 2002, 324 m (1063 ft) NNE (26.44 true) from bench mark
3443 A 1979, 207 m (679 ft) north (4.25 true) from bench mark 3443 D 2002, 103
m (338 ft) NW and seaward from the nearest point of the sand bluff where
vegetation begins, and flush with the surface of the rock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3443 D 2002
DESIGNATION: 945 3443 D
MONUMENTATION: Tidal Station disk VM#: 16890
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a set in the southwesterly third of a small grassy meadow, 230
m (755 ft) NE (49.17 true) from bench mark 3443 E 2002, 154 m (505 ft) NE
(56.93 true) from bench mark 3443 A 2002, 207 m (679 ft) south (184.25 true)
from bench mark 3443 C 2002, 22.16 m (72.7 ft) SE from the edge of vegetation
and the top of a sand bluff above the beach. The datum point is set 7 cm (0.2
ft) below ground, being the top of a 9/16-inch diameter stainless steel rod with
a rounded top and punchmark in the center, driven 8.5 m (28 ft) to refusal, and
encased in a 5-inch PVC pipe with NOS logo cap.
BENCH MARK STAMPING: 3443 E 2002
DESIGNATION: 945 3443 E
MONUMENTATION: Tidal Station disk VM#: 16891
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a disk set on top of a 4 m x 2 m x 3 m (13 ft x 7 ft x 10 ft)
high boulder, 351 m (1152 ft) NW (317.16 true) from bench mark 3443 F 2002, 230
m (755 ft) SW (229.17 true) from bench mark 3443 D 2002, 80 m (263 ft) SW
(214.12 true) from bench mark 3443 A 2002, 24 m (79 ft) WNW from the toe of a
10 m (33 ft) high bluff at the top of the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S8967 WCMC L1C4 C1L2 1986
DESIGNATION: 945 3443 S8967 BLM#1
ALIAS: BLM #1
MONUMENTATION: Aluminum marker VM#: 16892
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Aluminum cap OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a 3.5 inch diameter aluminum cap installed to a witness post,
being Comer 1 of Lot 2 and Comer 4 of Lot 1, 191 m (627 ft) SE from benchmark
3443 E 2002, 66 m (216 ft) NW from bench mark S8967 WCMC L2C7 C1C3, 13 m (43 ft)
NE and inland from the edge of vegetation at the top of the beach, 6 m (19 ft)
NNE from a 0.5 m (1.5 ft) diameter spruce bearing tree, and 0.12 m (0.4 ft)
above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S8967 WCMC L2C7 C1L3 1986
DESIGNATION: 945 3443 S8967 BLM #2
ALIAS: BLM #2
MONUMENTATION: Aluminum marker VM#: 16893
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Aluminum cap OPUS PID:
LATITUDE: 59° 55.8' N ( 59.93000) LONGITUDE: 141° 21.8' W (-141.36300)
The bench mark is a 3.5 inch diameter BLM aluminum cap installed to a witness
post, being Comer 7 of Lot 2 and Comer 1 of Lot 3, 96 m (315 ft) NW from bench
mark 3443 F 2002, 66 m (216 ft) SE from bench mark S8967 WCMC L1C4 C1L2, 22 m
(71 ft) east from the edge of vegetation along a survey cut line, 6 m (19 ft)
WNW from a 0.3 m (1 ft) diameter spruce bearing tree, and 0.46 m (0.15 ft) above
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
T I D A L D A T U M S
Tidal datums at MORAINE BAY, ICY BAY based on:
LENGTH OF SERIES: 30 DAYS
TIME PERIOD: Jun 1 2002 - Jun 30 2002
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9453220 YAKUTAT, YAKUTAT BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.969
MEAN HIGH WATER MHW = 2.716
MEAN SEA LEVEL MSL = 1.565
MEAN TIDE LEVEL MTL = 1.564
MEAN LOW WATER MLW = 0.412
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3443 F 2002 4.724 2.008
3443 A 1979 3.759 1.043
3443 C 1979 3.226 0.510
3443 D 2002 5.589 2.873
3443 E 2002 5.167 2.451
S8967 WCMC L1C4 C1L2 1986 6.743 4.027
S8967 WCMC L2C7 C1L3 1986 7.471 4.755
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9453443 PUBLICATION DATE: 06/27/2018
Name: MORAINE BAY, ICY BAY
AK
NOAA Chart: 16741 Latitude: 59° 55.8' N ( 59.93000)
USGS Quad: ICY BAY (D-2 & D-3) Longitude: 141° 21.8' W (-141.36300)
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.