U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
To reach the tidal bench marks from the Sitka Post Office located at the
intersection of Lincoln and Katlian Streets, travel 0.4 km (0.25 mi) NW on
Katlian Street to the Sitka Sound Seafood Dock. Proceed seaward down the pier
76.20 m (250.0 ft), on the south side of the pier there is a fish processing
building which houses the tide station in the NE corner. The bench marks are
located in the general vicinity of the dock area.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1600 L 1982
DESIGNATION: 945 1600 L
MONUMENTATION: Tidal Station disk VM#: 1186
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 57° 3.0' N ( 57.05028) LONGITUDE: 135° 20.3' W (-135.33825)
The primary bench mark is a disk set flush in bedrock in the NE end of a rock
outcrop on the north side of the grounds of the Alaska Pioneers Home, 10.97 m
(36.0 ft) south from a 2 m (8 ft) chain link fence, 6.77 m (22.2 ft) SE from the
SE corner of the green house building, 6.28 m (20.6 ft) west of the NW corner of
the yellow cement building, 0.30 m (1.0 ft) from the edge of the outcropping
which is inside the fenced area of the greenhouse, and 1.04 m (3.4 ft) above
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 16 1941
DESIGNATION: 945 1600 TIDAL 16
MONUMENTATION: Tidal Station disk VM#: 1179
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 57° 3.0' N ( 57.04994) LONGITUDE: 135° 20.3' W (-135.33906)
The bench mark is a disk set flush in the concrete sidewalk leading diagonally
(eastward) to the flag pole (Pioneer Monument) at the NW corner of the grounds
of the Alaska Pioneers Home, 5.18 m (17.0 ft) south of the north boundary wall
of the Home, 0.76 m (2.5 ft) from the inner edge of Katlian Street sidewalk, and
0.24 m (0.8 ft) north of a low retaining wall.
BENCH MARK STAMPING: TIDAL 24 1974
DESIGNATION: 945 1600 TIDAL 24
MONUMENTATION: Tidal Station disk VM#: 1183
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete floor OPUS PID:
LATITUDE: 57° 3.1' N ( 57.05197) LONGITUDE: 135° 20.5' W (-135.34222)
The bench mark is set in the north end of a 3m x 3 m (10 ft x 11 ft) high garage
door entrance of the Sitka Seafood and Sausage Factory located at 318 Katlian
Street, across the street from the Sitka Sound dock, and 17.40 m (57.1 ft) east
of the centerline of Katlian Street, 2.83 m (9.3 ft) north of south edge of
garage door, 0.22 m south of north edge of garage door, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 18 1947
DESIGNATION: 945 1600 TIDAL 18
MONUMENTATION: Tidal Station disk VM#: 12615
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 57° 3.0' N ( 57.05014) LONGITUDE: 135° 20.3' W (-135.33844)
The bench mark is a disk set in depression of the SW end of a rock outcrop near
the north side of the grounds of the Alaska Pioneers Home, 31 m (100 ft) north
of flagpole, 24 m (80 ft) south of intersection of Seward and Kogwantan Streets,
18 m (60 ft) SE of the NW corner of a chain link fence, 10 m (31 ft) NE of NE
face of house on grounds of Alaska Pioneers Home, 5.94 m (19.5 ft) west of the
highest point of rock formation, and 2 m (8 ft) lower than that highest point.
BENCH MARK STAMPING: 1600 N 1997
DESIGNATION: 945 1600 N
MONUMENTATION: Tidal Station disk VM#: 13750
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: bedrock OPUS PID#: BBBB42
LATITUDE: 57° 3.0' N ( 57.05058) LONGITUDE: 135° 20.3' W (-135.33881)
The bench mark is a disk set in the lowest exposed SE ledge of bedrock
outcropping south of the old Russian blockhouse (octagonal log fort), north of
Seward Street, west of the Alaska Pioneer Home Greenhouse, 23.47 m (77.0 ft) NNE
of telephone pole marked DEPA 45, 18.29 m (60.0 ft) east of house numbered 208
Seward Street, 10.82 m (35.5 ft) ENE of aluminum USPS mailboxes, 1 m (3 ft)
south of main body of bedrock outcropping, and 0.76 m (2.5 ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1600 P 1998
DESIGNATION: 945 1600 P
MONUMENTATION: Tidal Station disk VM#: 14007
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base of a flagpole OPUS PID#: BBFF16
LATITUDE: 57° 2.9' N ( 57.04892) LONGITUDE: 135° 20.4' W (-135.33928)
The bench mark is a disk set at the base of a flagpole near old post office now
converted to a municipal building along Lincoln Street, 17.20 m (56.4 ft) east
of a fire hydrant in front of KCAW radio station building, 11.4 m (37.4 ft)
south of centerline of Lincoln Street, 8.50 m (27.9 ft) west of corner of the
building, and 1.50 m (4.9 ft) above ground.
BENCH MARK STAMPING: 1600 R 1998
DESIGNATION: 945 1600 R
MONUMENTATION: Tidal Station disk VM#: 14008
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge support column OPUS PID:
LATITUDE: 57° 2.9' N ( 57.04803) LONGITUDE: 135° 20.4' W (-135.33919)
The bench mark is a disk set at the base of third bridge support column from
east end of the bridge to Japonski Island, 3.10 m (10.2 ft) west of west edge of
sidewalk, 3.10 m (10.2 ft) west of east edge of the sidewalk, and 0.3 m (1 ft)
north of the NW corner of the column.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1600 S 1999
DESIGNATION: 945 1600 S
MONUMENTATION: Tidal Station disk VM#: 15902
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 57° 3.0' N ( 57.05025) LONGITUDE: 135° 20.4' W (-135.34042)
The bench mark is a disk set in the NE side of a concrete foundation of a green
transformer box, located on the west side of Katlian Street in the parking lot
of Totem Square and Alaska Department of Health and Social Services, Division of
Public Assistance Office, 21.38 m (70.1 ft) west of power pole B3 4, 10.0 m
(32.8 ft) north of south edge of door to Public Assistance Office, 3.40 m (11.15
ft) east of power pole B3 4A, and 0.25 m (0.82 ft) above parking lot grade.
BENCH MARK STAMPING: BM ELEV 17.35 1997
DESIGNATION: 945 1600 BM ELEV 17.35
MONUMENTATION: Bench Mark disk VM#: 17657
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Asphalt walkway OPUS PID:
LATITUDE: 57° 2.9' N ( 57.04833) LONGITUDE: 135° 20.3' W (-135.33806)
The benchmark is a disk located in downtown Sitka at the base of Castle Hill
north of the bridge ih an ashphalt walkway, 10.33 m (33.9 ft) NE of NE corner of
a green transformer vault # 128, 9.52 m (31.2 ft) north of a metal street light
pole, 2.80 m (9.2 ft) south of the base of castle hill, and 0.11m (0.40 ft)
below sidewalk grade, and under aluminum access cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1600 T 2006
DESIGNATION: 945 1600 T
MONUMENTATION: Tidal Station disk VM#: 18149
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 57° 3.1' N ( 57.05089) LONGITUDE: 135° 20.5' W (-135.34114)
The bench mark is disk set flush in the concrete sidewalk located on the south
side of Katlian Street, 17.10 m (56.1 ft) west of a yellow fire hydrant on the
north side of Katlian Street, 3.44 m (11.3 ft) north of the north corner of the
green and white "Camp NO 1" building at 235 Katlian Street, 1.58 m (5.2 ft) NE
of the center of a storm drain in the sidewalk, and 0.49 m (1.6 ft) south of the
north edge of the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
T I D A L D A T U M S
Tidal datums at SITKA, BARANOF ISLAND, SITKA SOUND 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 (11/02/1948) = 4.534
MEAN HIGHER HIGH WATER MHHW = 3.029
MEAN HIGH WATER MHW = 2.791
MEAN TIDE LEVEL MTL = 1.618
MEAN SEA LEVEL MSL = 1.610
MEAN LOW WATER MLW = 0.445
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/14/2008) = -1.250
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1600 L 1982 12.290 9.499
16 1941 6.268 3.477
TIDAL 24 1974 6.124 3.333
NO 18 1947 10.711 7.920
1600 N 1997 12.137 9.346
1600 P 1998 6.958 4.167
1600 R 1998 4.721 1.931
1600 S 1999 5.596 2.805
BM ELEV 17.35 1997 5.375 2.584
1600 T 2006 5.171 2.380
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9451600 PUBLICATION DATE: 05/17/2017
Name: SITKA, BARANOF ISLAND, SITKA SOUND
AK
NOAA Chart: 17327 Latitude: 57° 3.1' N ( 57.05170)
USGS Quad: SITKA A-4 Longitude: 135° 20.5' W (-135.34200)
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.