U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9451528 PUBLICATION DATE: 04/19/2010
Name: KAKE HARBOR
AK
NOAA Chart: 17368 Latitude: 56° 56.9' N ( 56.94831)
USGS Quad: PETERSBURG (D-6) Longitude: 133° 53.7' W (-133.89472)
To reach the tide station from the Kake airport, follow Airport Road NW out of
the airport parking lot for 0.36 mi (0.58 km), turn left on Keku Road and travel
southeasterly for 1.71 mi (2.75 km) to the Kake harbor parking lot. The tide
house was at the base of the wooden pier out to the floating dock. The Primary
bench mark is west of the parking lot on the north side of Keku Road, the other
bench marks are along Keku Road and around the perimeter of the harbor parking
lot.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1528 A 2009
DESIGNATION: 945 1528 A
MONUMENTATION: Tidal Station disk VM#: 19560
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock. OPUS PID:
LATITUDE: 56° 57.0' N ( 56.94930) LONGITUDE: 133° 53.8' W (-133.89658)
The primary bench mark is set in bedrock on the north side of Keku Road which
leads to the harbor, 52.85 m (173.4 ft) east of power pole number 3028-3029,
35.19 m (115.4 ft) WNW of power pole number 3029-3030 and 5.9 1m (19.4 ft) north
of the centerline of Keku Road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9451528 PUBLICATION DATE: 04/19/2010
Name: KAKE HARBOR
AK
NOAA Chart: 17368 Latitude: 56° 56.9' N ( 56.94831)
USGS Quad: PETERSBURG (D-6) Longitude: 133° 53.7' W (-133.89472)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1528 B 2009
DESIGNATION: 945 1528 B
MONUMENTATION: Tidal Station disk VM#: 19561
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock. OPUS PID:
LATITUDE: 56° 56.9' N ( 56.94912) LONGITUDE: 133° 53.8' W (-133.89605)
The bench mark is set in bedrock on the north side of Keku Road which leads to
the harbor near where the road begins to turn eastward into the harbor parking
lot, 46.2 7m (151.8 ft) WNW of a yellow fire hydrant next to the base of the
wooden pier out to the floating dock, 15.57 m (51.1 ft) NNE of power pole
3029-3030, 8.22 m (27.0 ft) north of the centerline of Keku Road and 1.20 m (3.9
ft) above the surface of road.
BENCH MARK STAMPING: 1528 C 2009
DESIGNATION: 945 1528 C
MONUMENTATION: Tidal Station disk VM#: 19562
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock. OPUS PID:
LATITUDE: 56° 57.0' N ( 56.94920) LONGITUDE: 133° 53.7' W (-133.89513)
The bench mark is set in bedrock on the western side of the harbor parking lot,
43.74 m (143.5 ft) NE of the center of the top of the concrete boat launch ramp,
28.48 m (93.4 ft) NNE of the yellow fire hydrant near the base of the wooden
pier leading out to the floating dock, 3.02 m (9.9 ft) west of the western edge
of the parking lot pavement and 0.71 m (2.3 ft) above the surface of the parking
lot.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9451528 PUBLICATION DATE: 04/19/2010
Name: KAKE HARBOR
AK
NOAA Chart: 17368 Latitude: 56° 56.9' N ( 56.94831)
USGS Quad: PETERSBURG (D-6) Longitude: 133° 53.7' W (-133.89472)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1528 D 2009
DESIGNATION: 945 1528 D
MONUMENTATION: Tidal Station disk VM#: 19563
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock. OPUS PID:
LATITUDE: 56° 56.9' N ( 56.94913) LONGITUDE: 133° 53.6' W (-133.89397)
The bench mark is set in bedrock NE of the NE corner of harbor parking lot east
of a small stream, 14.79 m (48.5 ft) east of the eastern edge of parking lot
pavement, 5.17 m (17.0 ft) NE of the NE corner of a tan sheet metal building and
1.05 m (3.4 ft) above the level of the parking lot.
BENCH MARK STAMPING: 1528 E 2009
DESIGNATION: 945 1528 E
MONUMENTATION: Tidal Station disk VM#: 19564
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock. OPUS PID#: BBBQ32
LATITUDE: 56° 56.9' N ( 56.94895) LONGITUDE: 133° 53.7' W (-133.89467)
The bench mark is set in the western side of the second block from the top of
the pre-cast concrete boat launch ramp, 42.06 m (138.0 ft) east of the yellow
fire hydrant near the base of the wooden pier leading to the floating dock,
21.16 m (69.4 ft) SW of the SW corner of a tan sheet metal building, 0.88 m (2.9
ft) south of the top of the concrete ramp and 0.22 m (0.7 ft) east of the
western edge of concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9451528 PUBLICATION DATE: 04/19/2010
Name: KAKE HARBOR
AK
NOAA Chart: 17368 Latitude: 56° 56.9' N ( 56.94831)
USGS Quad: PETERSBURG (D-6) Longitude: 133° 53.7' W (-133.89472)
T I D A L D A T U M S
Tidal datums at KAKE HARBOR based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: November 2009 - December 2009
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9451600 SITKA, BARONOF ISLAND, SITKA SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 4.340
MEAN HIGH WATER MHW = 4.065
MEAN SEA LEVEL MSL = 2.288
MEAN TIDE LEVEL MTL = 2.265
MEAN LOW WATER MLW = 0.466
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1528 A 2009 7.325 3.260
1528 B 2009 7.898 3.834
1528 C 2009 8.015 3.950
1528 D 2009 9.725 5.660
1528 E 2009 6.162 2.097
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9451528 PUBLICATION DATE: 04/19/2010
Name: KAKE HARBOR
AK
NOAA Chart: 17368 Latitude: 56° 56.9' N ( 56.94831)
USGS Quad: PETERSBURG (D-6) Longitude: 133° 53.7' W (-133.89472)
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.