U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
To reach the tidal bench marks from the airport, travel east on the main road to
Yakutat for 8.0 km (5.0 mi), passing the Loran Spur and Ophir Creek. Take the
third gravel road downhill leading to the Ocean Cape Dock and Sitka Sound
Seafoods Company processing plant and storage garage. The tide gauge is located
in the second floor of the ice house at the SW end of the pier. The bench marks
are located along the roads in the vicinity of the tide house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3220 Z 1986
DESIGNATION: 945 3220 Z
MONUMENTATION: Tidal Station disk VM#: 1213
AGENCY: National Ocean Service (NOS) IDB PID#: AI4930
SETTING CLASSIFICATION: Concrete bull rail OPUS PID:
LATITUDE: 59° 27.3' N ( 59.45583) LONGITUDE: 139° 18.7' W (-139.31175)
The primary bench mark is a disk set in top of the southern bull rail of the
Yakutat Seafood dock, 29.81 m (97.8 ft) west of the sea wall, 21.76 m (71.4 ft)
SE of the SE corner of the ice house belonging to Sitka Sound Seafoods Company,
1.86 m ( 6.1 ft) east of the east edge of the metal frame which used to support
the old tide house, and 0.30 m (1.0 ft) above pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3220 M 1977
DESIGNATION: 945 3220 M
MONUMENTATION: Tidal Station disk VM#: 1219
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel drive rod OPUS PID#: BBBD27
LATITUDE: 59° 32.7' N ( 59.54539) LONGITUDE: 139° 43.6' W (-139.72722)
The bench mark is a disk located near a telephone pole with a witness post,
30.48 m (100.0 ft) west of the centerline intersection of Yakutat Road and Ocean
Cape Road, 0.67 m (2.2 ft) south of the telephone pole "7005 7006", and 0.61 m
(2.0 ft) north of the telephone pole support cable with ceramic connector. The
bench mark is set at ground level, crimped to a copper-clad steel rod driven to
a depth of 7.3 m (24 ft), and encased in a 4-inch PVC pipe extending 0.15 m (0.5
ft) above the disk.
BENCH MARK STAMPING: 3220 Q 1977
DESIGNATION: 945 3220 Q
MONUMENTATION: Tidal Station disk VM#: 1221
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 59° 32.7' N ( 59.54492) LONGITUDE: 139° 43.8' W (-139.73047)
The bench mark is a disk set flush in the north face of the concrete entrance of
the AC grocery store located along Ocean Cape Road/Arco Road, 26.21 m (86.0 ft)
SW of bench mark 945 3220 R, 22.25 m (73.0 ft) SE of the centerline of the road,
5.70 m (18.7 ft) east of the NW corner of the building, and 2.13 m (7.0ft) NW of
the doorway. Note - 1999: Building covers 1/3 of the mark. Folding rod
required for 3.0 m (10 ft) overhang.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3220 R 1977
DESIGNATION: 945 3220 R
MONUMENTATION: Tidal Station disk VM#: 1222
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 59° 32.7' N ( 59.54500) LONGITUDE: 139° 43.8' W (-139.72975)
The bench mark is a disk set in the north face of the concrete apron of the
easternmost of the two Yakutat Marine and Supply warehouse garage doors located
along Ocean Cape Road and Arco Road, 27 m (90 ft) SE of the centerline of the
road, 26.21 m (86.0 ft) NE of bench mark 945 3220 Q, 12 m (39 ft) NE of the west
corner of the garage, 2 m (8 ft) SE of the north corner of the apron, and 0.3 m
(1 ft) NW of the northernmost door.
BENCH MARK STAMPING: 3220 T 1977
DESIGNATION: 945 3220 T
MONUMENTATION: Tidal Station disk VM#: 1224
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 59° 32.7' N ( 59.54467) LONGITUDE: 139° 43.9' W (-139.73106)
The bench mark is a disk set flush in the concrete porch of the green house
located across the street from the Mooring Lodge at the corner of White Alice
Road and Ocean Cape Road/National Forest Development Road 9962, 35.00 m (114.8
ft) NE of a red fire hydrant, 19.80 m (65.0 ft) east of the centerline of White
Alice Road, 1.22 m (4.0 ft) south of the north edge of the concrete porch, and
0.30 m (1.0 ft) west of the east edge of the porch.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3220 V 1986
DESIGNATION: 945 3220 V
MONUMENTATION: Tidal Station disk VM#: 1226
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel drive rod OPUS PID:
LATITUDE: 59° 32.8' N ( 59.54614) LONGITUDE: 139° 43.4' W (-139.72367)
The bench mark is a disk located at the end of an east-west running gravel trail
next to two office trailers located NE of the Yakutat Seafood processing plant,
5.80 m (19.0 ft) sloping south of the southern edge of the Max Italio Drive
leading to the Yakutat Seafood pier, 0.80 m (2.62 ft) NW of the NW corner of the
western most office trailer, 0.58 m (1.9 ft) NW of a yellow "Road Closed" sign,
and 0.46 m (1.5 ft) SW of an orange NOS witness post. The bench mark is set 0.3
m (0.9 ft) below ground level, crimped to the top of a stainless steel rod
driven to 23.2 m (76.0 ft) to minimal resistance, and encased beneath an NGS
access cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3220 Y 1986
DESIGNATION: 945 3220 Y
MONUMENTATION: Tidal Station disk VM#: 1229
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite boulder OPUS PID:
LATITUDE: 59° 33.0' N ( 59.55039) LONGITUDE: 139° 44.3' W (-139.73822)
The bench mark is a disk set in a 2.1 m x 1.5 m (7.0 ft x 5.0 ft) ) granite
boulder located in a depression south of the gravel road that leads to the Ocean
Cape Dock, 37.80 m (124.0 ft) SE of the SE corner of Mallott's General Store,
15.85 m (52.0 ft) south of the centerline of the gravel road, 14.02 m (46.0 ft)
SE from a large cottonwood tree, 6.55 m (21.5 ft) NW of the conifer with blaze
mark on the trunk, 1.37 m (4.5 ft) north of an NOS orange witness post, and 0.24
m (0.8 ft) above ground level.
BENCH MARK STAMPING: 3220 A 2002
DESIGNATION: 945 3220 A
MONUMENTATION: Tidal Station disk VM#: 16724
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite outcrop OPUS PID:
LATITUDE: 59° 33.0' N ( 59.54950) LONGITUDE: 139° 44.1' W (-139.73478)
The bench mark is a disk set flush in a granite outcrop located on the north
side of Max Italio Drive, 14.78 m (48.5 ft) west of the SW corner of Monti Bay
Times building, a two story wooden building located on the north side of the
road, 11.58 m (38.0 ft) north of the south edge of the gravel road, and 1.37 m
(4.5 ft) SE of the east end of a creasote wooden retaining wall, and 1.0 m (3.3
ft) above the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3220 AA 2011
DESIGNATION: 945 3220 AA
MONUMENTATION: Tidal Station disk VM#: 20013
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete vault OPUS PID#: BBCJ29
LATITUDE: 59° 32.8' N ( 59.54717) LONGITUDE: 139° 43.8' W (-139.72922)
The bench mark is a disk set flush in a concrete water main vault across from
the hardware store on Yakutat Road, 10.11 m (33.2 ft) west of the centerline of
the road, 2.48 m (8.1 ft) NNE of telephone pole 7011 7012, and 0.71 m (2.3 ft)
east of a red fire hydrant.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
T I D A L D A T U M S
Tidal datums at YAKUTAT, YAKUTAT BAY based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: Jan '83 - Dec '01 & Jan '12 - Dec '16
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (03/28/1964) = 5.275
MEAN HIGHER HIGH WATER MHHW = 3.070
MEAN HIGH WATER MHW = 2.807
MEAN TIDE LEVEL MTL = 1.616
MEAN SEA LEVEL MSL = 1.615
MEAN LOW WATER MLW = 0.425
North American Vertical Datum NAVD88 = 0.179
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/14/2008) = -1.265
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3220 Z 1986 8.381 5.574
3220 M 1977 23.954 21.147
3220 Q 1977 26.617 23.810
3220 R 1977 26.623 23.816
3220 T 1977 27.024 24.217
3220 V 1986 11.807 9.000
3220 Y 1986 16.850 14.043
3220 A 2002 14.688 11.881
3220 AA 2011 23.962 21.155
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
Foot Notes:
Certain geographic areas are experiencing rapid land movement due to uplift or
subsidence, which results in anomalous relative sea level trends compared to
most other coastal regions in the United States
(http://tidesandcurrents.noaa.gov/sltrends/index.shtml). In these areas, NOAA
has adopted a modified procedure for computing accepted tidal datums for the
National Water Level Observation Network (NWLON). The long-term control stations
in these areas have tidal datums reviewed approximately every 5 years, and if
they meet the criteria for an update, the 5-year period used for the modified
procedure will be listed in the Time Period section for the datums. The adoption
of this procedure was necessary to ensure that these tidal datums accurately
represent the existing stand of sea level relative to the land. A detailed
report explaining this modified procedure can be found in the publications
section of the CO-OPS Tides & Currents website at
http://tidesandcurrents.noaa.gov/pub.html.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 9453220 PUBLICATION DATE: 02/16/2018
Name: YAKUTAT, YAKUTAT BAY
AK
NOAA Chart: 16761 Latitude: 59° 32.9' N ( 59.54850)
USGS Quad: YAKUTAT C-5 Longitude: 139° 44.0' W (-139.73340)
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.