U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9457527 PUBLICATION DATE: 06/29/2018
Name: OLD HARBOR
AK
NOAA Chart: 165922 Latitude: 57° 12.2' N ( 57.20278)
USGS Quad: KODIAK (A-4) Longitude: 153° 18.2' W (-153.30389)
To reach from the Kodiak airport travel by vehicle 11.6 km (7.2 miles) NE to St.
Paul's Harbor in the city of Kodiak, from St. Paul's Harbor travel by boat SW
for 1.85 km (1.0 nm), then SSW for 3.89 km (2.1 nm), then SE for 23.15 km (12.5
nm) to Cape Chiniak, from Cape Chiniak, proceed SSW for 25.00 km (13.5 nm) then
turn west heading for 30.56 km (16.5 nm) passing between Narrow Cape and Ugak
Island, continue on a southwesterly heading for 27.78 km (15.0 nm) entering
Sitkalidak Strait, from here, turn to the WNW (270o mag) for 6.11 km (3.30 nm)
to Bush Point, navigate to the south of Sheep Island for 2.59 km (1.40 nm)
reaching the north end of Sitkalidak Passage, proceed SW for 1.85 km (1.00 nm),
turn to starboard and head WNW for 0.93 km (0.50 nm) to the entrance markers for
the small boat harbor. The tide gauges are located on the fixed wooden pier at
the south end of the village. The tidal bench marks are located around the
village south of the harbor and on the beach south of the village.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7527 E 2009
DESIGNATION: 945 7527 E
MONUMENTATION: Tidal Station disk VM#: 19477
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete slab OPUS PID#: BBBL05
LATITUDE: 57° 12.1' N ( 57.20089) LONGITUDE: 153° 18.4' W (-153.30711)
The primary bench mark is a disk set flush in the SE corner of a 1.90 m x 2.20 m
( 6.23 ft x 7.22 ft) concrete slab poured for 3 bollards and a water hydrant,
7.44m (24.4 ft) from the SE corner of a wood frame single story house, 7.35 m
(24.1 ft) north of the southernmost east/west road in the village and 1.65 m
(5.41 ft) SE of the water hydrant, 5.33 m (17.5 ft) west of centerline of a
gravel road fronting the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9457527 PUBLICATION DATE: 06/29/2018
Name: OLD HARBOR
AK
NOAA Chart: 165922 Latitude: 57° 12.2' N ( 57.20278)
USGS Quad: KODIAK (A-4) Longitude: 153° 18.2' W (-153.30389)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7527 A 2009
DESIGNATION: 945 7527 A
MONUMENTATION: Tidal Station disk VM#: 19478
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite boulder OPUS PID:
LATITUDE: 57° 11.9' N ( 57.19811) LONGITUDE: 153° 18.8' W (-153.31356)
The bench mark is a set flush in 1m x 1m x 0.75 m granite boulder 61.10 m
(200.5 ft) south of bench mark 945 7527 B, 12.73 m (41.7 ft) north of a
freshwater seep in the bluff, 3.99 m (13.1 ft) east of the base of a black shale
outcrop, and 0.60 m (2.0 ft) above beach level.
BENCH MARK STAMPING: 7527 B 2009
DESIGNATION: 945 7527 B
MONUMENTATION: Tidal Station disk VM#: 19479
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Black shale boulder OPUS PID:
LATITUDE: 57° 11.9' N ( 57.19839) LONGITUDE: 153° 18.8' W (-153.31278)
The bench mark is set flush in 1m x 1m x 1m black shale boulder 61.10 m (200.4
ft) north of bench mark 945 7527 A, 11.43 m (37.5 ft) east of the base of a
bluff, 7.25 m (23.1 ft) north of 1m x 1m x 1m granite boulder embedded in the
beach, and 0.75 m (2.5 ft) above beach level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9457527 PUBLICATION DATE: 06/29/2018
Name: OLD HARBOR
AK
NOAA Chart: 165922 Latitude: 57° 12.2' N ( 57.20278)
USGS Quad: KODIAK (A-4) Longitude: 153° 18.2' W (-153.30389)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7527 C 2009
DESIGNATION: 945 7527 C
MONUMENTATION: Tidal Station disk VM#: 19480
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 57° 12.1' N ( 57.20217) LONGITUDE: 153° 18.4' W (-153.30664)
The bench mark is set flush in the SE corner of a 1.90 m x 1.90 m (6.23 ft x
6.23 ft) concrete slab supporting 4 bollards around a water hydrant, 6.10 m
(20.0 ft) south of center line of the nearest east/west gravel road, 4.65 m
(15.2 ft) west of the NE corner of a single story wood frame house, 0.53 m (1.7
ft) east of the bottom flange of the hydrant.
BENCH MARK STAMPING: 7527 D 2009
DESIGNATION: 945 7527 D
MONUMENTATION: Tidal Station disk VM#: 19481
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 57° 12.1' N ( 57.20119) LONGITUDE: 153° 18.5' W (-153.30783)
The bench mark is set in the SE corner of a 1.90 m x 2.20 m (6.23 ft x 7.22 ft)
concrete slab supporting a water hydrant and two bollards 14.05 m (46.1 ft) NE
of the NW corner of the Russian Orthodox Church, 5.72 m (18.8 ft) south of
centerline of an east/west running gravel road, 1.42 m (4.7 ft) SE of the
hydrant flange, and 0.55 m (1.8 ft) east of center of water valve case.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9457527 PUBLICATION DATE: 06/29/2018
Name: OLD HARBOR
AK
NOAA Chart: 165922 Latitude: 57° 12.2' N ( 57.20278)
USGS Quad: KODIAK (A-4) Longitude: 153° 18.2' W (-153.30389)
T I D A L D A T U M S
Tidal datums at OLD HARBOR based on:
LENGTH OF SERIES: 30 DAYS
TIME PERIOD: Aug 22 2009 - Sep 20 2009
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9457292 KODIAK ISLAND, WOMENS BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.534
MEAN HIGH WATER MHW = 2.340
MEAN TIDE LEVEL MTL = 1.355
MEAN SEA LEVEL MSL = 1.348
MEAN LOW WATER MLW = 0.369
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7527 E 2009 4.488 2.148
7527 A 2009 2.325 -0.015
7527 B 2009 2.025 -0.316
7527 C 2009 4.460 2.120
7527 D 2009 4.677 2.337
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9457527 PUBLICATION DATE: 06/29/2018
Name: OLD HARBOR
AK
NOAA Chart: 165922 Latitude: 57° 12.2' N ( 57.20278)
USGS Quad: KODIAK (A-4) Longitude: 153° 18.2' W (-153.30389)
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.