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National Ocean Service
Datums Page Page 1 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
To reach the tidal bench marks from ferry: Head west toward the Alaska Railroad
pier. Gauge is located in the SW corner of the Cruise Ship Terminal building
located on the pier. To reach the tidal bench marks from Highway: Route 1
(Seward Highway) from Anchorage or Homer to Route 9 to Seward; as soon as you
enter Seward look for boat harbor. Prior to reaching the boat harbor make a
left on Port Avenue. L ook for the large wooden Alaska Railroad sign on the
south side of Port Ave. Turn right just before reaching the sign. This road
will lead to the Alaska Railroad pier. Gauge is located in the SW corner of the
Cruise Ship Terminal building located on the pier. Note: Tide the tide station
is located in a MARSEC regulated area; permission must be granted prior to
access some of the bench marks.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5090 B 1978
DESIGNATION: 945 5090 B
MONUMENTATION: Tidal Station disk VM#: 1295
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete step OPUS PID#: BBFH75
LATITUDE: 60° 7.3' N ( 60.12200) LONGITUDE: 149° 26.1' W (-149.43478)
The primary bench mark is a disk set in the second concrete step of the stairway
leading to the south entrance to the Shoreside Petroleum, Inc. office at 700
Port Avenue, 76.00 m (249.3 ft) north of bench mark Tidal BM 26 1975, 19.51 m
(64.0 ft) east of southern terminus of east rail of railroad tracks leading to
the Seward Fisheries Processing Plant, 6.80 m (22.3 ft) north of the centerline
of Port Avenue, 0.10 m (0.3 ft) from the south edge of the second step and 0.37
m (l.2 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 19 1966
DESIGNATION: 945 5090 TIDAL 19
MONUMENTATION: Tidal Station disk VM#: 1290
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: Concrete pier OPUS PID#: BBBB43
LATITUDE: 60° 7.2' N ( 60.11925) LONGITUDE: 149° 25.7' W (-149.42872)
The bench mark is set flush in the western concrete face of the Cruise Ship and
Ferry Dock, 15 m (50 ft) west of the SW corner of the Alaska Railroad Passenger
Terminal, 2.4 m (8.0 ft) south of a line tangent to southern end of the
warehouse, and 0.06 m (0.2 ft) west of a double bollard.
BENCH MARK STAMPING: TIDAL BM 26 1975
DESIGNATION: 945 5090 TIDAL 26
MONUMENTATION: Tidal Station disk VM#: 1293
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 60° 7.3' N ( 60.12147) LONGITUDE: 149° 26.0' W (-149.43367)
The bench mark is a disk set vertically in the north face of a blue unnamed
cannery warehouse on the south side of Port Avenue and south of the Shoreside
Petroleum tank farm, 0.3 km (0.2 miles) east of Seward Highway, 76.00 m (249.30
ft) south of bench mark 9455090 B, 0.12 m (0.4 ft) east of NW corner of the
building, and 1.20 m (3.9 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 E 1982
DESIGNATION: 945 5090 E
MONUMENTATION: Tidal Station disk VM#: 1298
AGENCY: National Ocean Survey (NOS) IDB PID#: DQ3873
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: DQ3873
LATITUDE: 60° 7.3' N ( 60.12206) LONGITUDE: 149° 25.9' W (-149.43203)
The bench mark is a disk set 49.40 m (162.1 ft) west of red fire plug #116,
20.50 m (67.3 ft) SE of center of intersection of Port Avenue, and the paved
road into Seward Harbor short term parking, 11.46 m (37.6 ft) south of the
centerline of Port Avenue, and 0.68 m (2.2 ft) south of utility pole number
D11-38 with witness sign attached. The bench mark is set 0.15 m (0.5 ft) below
grade, crimped to the top of a copper clad rod driven 7.32 m (24.0 ft) to
refusal and encased in a 6-inch PVC pipe with aluminum logo cover which projects
0.10 m (0.3 ft) above the natural grade
BENCH MARK STAMPING: 5090 D 1991
DESIGNATION: 945 5090 D
MONUMENTATION: Tidal Station disk VM#: 4486
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation of a flood light
stanchion OPUS PID:
LATITUDE: 60° 7.2' N ( 60.11928) LONGITUDE: 149° 25.7' W (-149.42792)
The bench mark is a disk set horizontally in the base of a triangular shaped
concrete pad within the electrical transformer enclosure at the SE corner of the
Alaska Railroad Passenger Terminal on the Cruise Ship and Ferry Dock, 2.10 m
(6.9 ft) south of the SE corner of the Alaska Railroad Passenger Terminal, 1.49
m (4.9 ft) west of the gate leading to the electrical transformer enclosure, and
0.14 m (0.45 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 H 2001
DESIGNATION: 945 5090 H
MONUMENTATION: Tidal Station disk VM#: 16516
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 60° 7.3' N ( 60.12136) LONGITUDE: 149° 26.3' W (-149.43911)
The bench mark is a disk set in a rock outcrop, 31.00 m (101.7 ft) north of the
intersection of Port Avenue and 4th Avenue, 13.60 m (44.6 ft) NW of the west
rail, 2.00 m (6.6 ft) SE from top of hill, 3.20 m (10.5 ft) west of the
centerline of a creek and 1.00 m (3.3 ft) above the creek.
BENCH MARK STAMPING: 5090 J 2003
DESIGNATION: 945 5090 J
MONUMENTATION: Tidal Station disk VM#: 17147
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete Pier OPUS PID:
LATITUDE: 60° 7.2' N ( 60.11981) LONGITUDE: 149° 25.7' W (-149.42881)
The bench mark is a disk set flush in concrete in the NW corner of the Cruise
Ship and Ferry Dock, 15.15 m (49.7 ft) west of the NW corner of the Alaska
Railroad Passenger Terminal, 0.68 m (2.2 ft) south of south edge of the northern
most bollard, and 0.45 m (1.5 ft) east of the west side of the dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 K 2003
DESIGNATION: 945 5090 K
MONUMENTATION: Tidal Station disk VM#: 17148
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 60° 7.3' N ( 60.12178) LONGITUDE: 149° 26.2' W (-149.43681)
The bench mark is a disk set flush in the NW corner of a concrete foundation
supporting the Seward Fisheries Company's rectangular water tanks along the
south side of Port Avenue, 4.70 m (15.4 ft) south of the south curb of Port
Avenue, 4.50 m (14.8 ft) east of the east edge of a driveway leading to a
roll-up door, 4.25 m (13.9 ft) SW of utility pole "R I63 SF 24 3E 1M", and 0.65
m (2.1 ft) NW of the blue enclosure protecting the water tank pump controls on
the west end of the water tank.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 L 2003
DESIGNATION: 945 5090 L
MONUMENTATION: Flange-encased Rod VM#: 17149
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBCK09
LATITUDE: 60° 7.3' N ( 60.12219) LONGITUDE: 149° 25.8' W (-149.43039)
The bench mark is set 20.00 m (65.6 ft) SW of the intersection of Port Avenue
and the westernmost road leading to the Alaska Railroad Pier, 11.20 m (36.7 ft)
west of the centerline of the western most road leading to the pier, 9.22 m
(30.2 ft) SSW of the easternmost guardrail support on the south side of Port
Avenue, 3.95 m (13.0 ft) SE of utility pole "23", and 1.15 m (3.8 ft) east of
the NE corner post of the chain link fence surrounding the coal terminal
conveyor belt. The bench mark is set flush with the ground being the top of a
stainless steel rod driven 25.9 m (85.0 ft) to refusal and encased in a 6-inch
PVC pipe and aluminum logo cover which projects 0.20 m (0.6 ft) above the grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 N 2004
DESIGNATION: 945 5090 N
MONUMENTATION: Metal Rod VM#: 17659
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 60° 7.2' N ( 60.12014) LONGITUDE: 149° 25.8' W (-149.43017)
The bench mark is set east of the cyclone fence which runs along the western
most entrance road to the Cruise Ship and Ferry Dock and surrounds the coal
terminal conveyor belt, 6.25 m (20.5 ft) north of terminating cyclone fence
pole, 4.60 m (15.1 ft) SE of the flow meter on west side of the cyclone fence,
and 0.90 m (3.0 ft) east of the cyclone fence near the southernmost end of the
fence line with a metal witness post attached. The bench mark is set flush with
the ground, being the top of a stainless steel rod driven 15.39 m (50.5 ft) to
refusal and encased in a 6-inch PVC pipe and aluminum logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 M 2004
DESIGNATION: 945 5090 M
MONUMENTATION: Metal Rod VM#: 17660
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 60° 7.3' N ( 60.12114) LONGITUDE: 149° 25.8' W (-149.43036)
The bench mark is set 9.75 m (32.0 ft) west of the centerline of the western
most road leading to the Cruise Ship and Ferry Dock, 4.78 m (15.7 ft) SE from
the center connecting pipe of a double gate in the cyclone fence that runs along
the western most entrance road to the Cruise Ship and Ferry Dock and surrounds
the coal terminal conveyor belt, 1.71 m (5.6 ft) west of a sign post that has a
"Do Not Enter" and a "No Parking" sign on it and 0.88 m (2.9 ft) east of the
cyclone fence with metal witness post attached. The bench mark is set flush with
the ground, being the top of a stainless steel rod driven 26.97 m (88.5 ft) to
refusal and encased in a 6-inch PVC pipe and aluminum logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5090 P 2009
DESIGNATION: 945 5090 P
MONUMENTATION: Tidal Station disk VM#: 19144
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete utility pedestal OPUS PID#: BBFT30
LATITUDE: 60° 7.2' N ( 60.12039) LONGITUDE: 149° 25.7' W (-149.42783)
The bench mark is a disk set flush in a 2.47 m x 1.11 m x 0.56 m high (8.1 ft x
3.6 ft x 1.8 ft high) concrete utility pedestal, 47.16 m (154.7 ft) north of the
eastern fence post for the gate on the eastern side of the Dale R Lindsey Rail
Road building, 31.07 m (101.9 ft) SE of the first light pole north of the Dale R
Lindsey Rail Road building, 4.36 m (14.3 ft) east of the eastern most railroad
track of two sets of parallel rails, 1.31 m (4.3 ft) west of a 1.33 m (4.4 ft)
high yellow bollard the northeastern most of the four bollards surrounding the
utility pedestal/box, 1.07 m (3.5 ft) below the top of the green utility box on
the pedestal, and 0.56 m (1.8 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
T I D A L D A T U M S
Tidal datums at SEWARD, RESURRECTION BAY based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/01/1987) = 4.785
MEAN HIGHER HIGH WATER MHHW = 3.239
MEAN HIGH WATER MHW = 2.960
MEAN SEA LEVEL MSL = 1.694
MEAN TIDE LEVEL MTL = 1.691
MEAN LOW WATER MLW = 0.421
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/14/2008) = -1.527
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5090 B 1978 6.442 3.482
NO 19 1966 7.426 4.466
TIDAL BM 26 1975 7.188 4.228
5090 E 1982 5.231 2.271
5090 D 1991 7.591 4.631
5090 H 2001 6.096 3.136
5090 J 2003 7.407 4.447
5090 K 2003 5.595 2.635
5090 L 2003 6.780 3.820
5090 N 2004 5.845 2.885
5090 M 2004 6.214 3.254
5090 P 2009 7.962 5.002
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 11 of 11
Station ID: 9455090 PUBLICATION DATE: 09/30/2011
Name: SEWARD, RESURRECTION BAY
AK
NOAA Chart: 16682 Latitude: 60° 7.2' N ( 60.12000)
USGS Quad: SEWARD A-7 Longitude: 149° 25.6' W (-149.42667)
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.