U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9452438 PUBLICATION DATE: 06/27/2018
Name: HOONAH
AK
NOAA Chart: 17435 Latitude: 58° 6.5' N ( 58.10756)
USGS Quad: JUNEAU (A-5) Longitude: 135° 26.7' W (-135.44419)
To reach the tide station from the Hoonah Alaska Marine Highway ferry terminal
turn right onto Cannery Road and travel SE 0.28 km (0.17 mi) where the name of
the road changes to Front Street, continue SE on Front Street for 0.99 km (0.61
mi) to the intersection of Front Street, Garteeni Highway and Harbor Way, turn
right onto Harbor Way and and follow the road for 140 m (459 ft) SSW around a
left curve to the SSE to the base of the pier to the public floating dock. The
tide house is located at the base of the pier. The primary bench mark is west
of the public dock at the float plane dock ramp; other bench marks are located
along Harbor Way.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2438 A 2009
DESIGNATION: 945 2438 A
MONUMENTATION: Tidal Station disk VM#: 19565
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete abutment OPUS PID#: BBBQ31
LATITUDE: 58° 6.5' N ( 58.10795) LONGITUDE: 135° 26.8' W (-135.44690)
The primary bench mark is set in the northern end of the concrete abutment of
the ramp to the city float plane dock, 28.57 m (93.7 ft) north of the base of
the stone jetty extending SE from the float plane parking lot, 2.44 m (8.0 ft)
NNE of the center of the top of float plane ramp, 1.23 m (4.0 ft) SSE of the
float plane dock sign post, 0.22 m (0.7 ft) SSE of the northern edge of the
concrete and 0.22 m (0.7 ft) WNW of the eastern edge of the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9452438 PUBLICATION DATE: 06/27/2018
Name: HOONAH
AK
NOAA Chart: 17435 Latitude: 58° 6.5' N ( 58.10756)
USGS Quad: JUNEAU (A-5) Longitude: 135° 26.7' W (-135.44419)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2438 B 2009
DESIGNATION: 945 2438 B
MONUMENTATION: Tidal Station disk VM#: 19566
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 58° 6.5' N ( 58.10840) LONGITUDE: 135° 26.7' W (-135.44520)
The bench mark is set in the southern most 0.91 m x 1.18 m (2.98 ft x 3.87 ft)
concrete footing of the most westerly and tallest of large satellite dishes in a
series north of the road to the float plane dock, 119.80 m (393.0 ft) NW of
bench mark 945 2438 C, 15.5 40 m (51.0 ft) south of the western corner of the
Hoonah Sewage Treatment Plant building, 8.63 m (28.3 ft) SW of the southern
corner of the Hoonah Sewage Treatment Plant building and 0.56 m (1.8 ft) SW of
the southern most leg of three legs supporting the tallest dish.
BENCH MARK STAMPING: 2438 C 2009
DESIGNATION: 945 2438 C
MONUMENTATION: Tidal Station disk VM#: 19567
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 58° 6.5' N ( 58.10764) LONGITUDE: 135° 26.6' W (-135.44385)
The bench mark is set in the base of the concrete deck of the pier to the Hoonah
Harbor public (transient) floating dock, 119.80 m (393.0 ft) SE of bench mark
945 2438 B, 78.33 m (257.0 ft) NW of bench mark 945 2438 D, 12.44 m (40.8 ft) SW
of the centerline of the paved road to Harbor Harbor Way, 9.14 m (30.0 ft) NNE
of power pole number 2256-2259 and 0.31 m (1.0 ft) WSW of the NE edge of
concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9452438 PUBLICATION DATE: 06/27/2018
Name: HOONAH
AK
NOAA Chart: 17435 Latitude: 58° 6.5' N ( 58.10756)
USGS Quad: JUNEAU (A-5) Longitude: 135° 26.7' W (-135.44419)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2438 D 2009
DESIGNATION: 945 2438 D
MONUMENTATION: Tidal Station disk VM#: 19568
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 58° 6.4' N ( 58.10707) LONGITUDE: 135° 26.6' W (-135.44305)
The bench mark is set in a 1.50 m x 1.8 5m (4.9 ft x 6.1 ft) concrete pad for a
green transformer box near the Harbor Master s Office, 78.33 m (257.0 ft) SE of
bench mark 945 2438 C, 21.49 m (70.5 ft) SW of the centerline of the road to
Harbor Harbor Way, 10.63 m (38.9 ft) NW of a yellow fire hydrant, 2.09 m (6.8
ft) south of power pole number 2260-2261, 0.12 m (0.4 ft) SE of the NW edge of
concrete and 0.13 m (0.4 ft) NE of the SW edge of concrete.
BENCH MARK STAMPING: 2438 E 2009
DESIGNATION: 945 2438 E
MONUMENTATION: Tidal Station disk VM#: 19569
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 58° 6.5' N ( 58.10861) LONGITUDE: 135° 26.6' W (-135.44299)
The bench mark is set in the top of the western end of the concrete retaining
wall adjacent to the sidewalk in front of Hoonah High School, 43.57 m (142.9 ft)
SSW of the schools flagpole, 11.06 m (36.3 ft) east of a manhole cover in the
center of the road in front of the school and 7.60 m (24.9 ft) north of the
centerline of Garteeni Highway in front of school.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9452438 PUBLICATION DATE: 06/27/2018
Name: HOONAH
AK
NOAA Chart: 17435 Latitude: 58° 6.5' N ( 58.10756)
USGS Quad: JUNEAU (A-5) Longitude: 135° 26.7' W (-135.44419)
T I D A L D A T U M S
Tidal datums at HOONAH based on:
LENGTH OF SERIES: 30 DAYS
TIME PERIOD: Nov 1 2009 - Nov 30 2009
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9452210 JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 4.575
MEAN HIGH WATER MHW = 4.293
MEAN SEA LEVEL MSL = 2.414
MEAN TIDE LEVEL MTL = 2.385
MEAN LOW WATER MLW = 0.477
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2438 A 2009 7.523 3.230
2438 B 2009 8.346 4.053
2438 C 2009 7.331 3.038
2438 D 2009 6.957 2.664
2438 E 2009 10.300 6.007
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9452438 PUBLICATION DATE: 06/27/2018
Name: HOONAH
AK
NOAA Chart: 17435 Latitude: 58° 6.5' N ( 58.10756)
USGS Quad: JUNEAU (A-5) Longitude: 135° 26.7' W (-135.44419)
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.