U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 9455735 PUBLICATION DATE: 08/15/2018
Name: CHINULNA POINT, COOK INLET
AK
NOAA Chart: 16662 Latitude: 60° 30.2' N ( 60.50330)
USGS Quad: Kenai C-4 Longitude: 151° 17.0' W (-151.28300)
To reach the tidal bench marks from the town of Soldotna, take Kenai Spur
Highway west out of Soldotna, turn left on Bridge Access Road, then follow to
end. Turn right onto Kalifornisky Beach Road. Follow road 5.2 km (3.25 mi),
passing Cannery Road and firestation on the right. Turn right on Karluck Road
and follow to end. The bench marks are located in the general vicinity.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4 1974
MONUMENTATION: Survey disk VM#: 14166
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete floor OPUS PID:
LATITUDE: 60° 30.2' N ( 60.50330) LONGITUDE: 151° 17.0' W (-151.28300)
The bench mark is a disk set in a concrete floor of a covered garage in a
two-story white house, 2.00 m (6.6 ft) south of the door at the NW corner,
directly below the north edge of the window on the east wall of the garage.
BENCH MARK STAMPING: 6 1974
MONUMENTATION: Survey disk VM#: 14168
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 60° 30.2' N ( 60.50330) LONGITUDE: 151° 17.0' W (-151.28300)
The bench mark is a disk set in the SE corner of a concrete walkway around an
enclosed trailer, north of a two-story white house, 0.80 m (2.6 ft) west from
the end of the walk, and 0.50 m (1.6 ft) out from and even with the end of the
east single garage door.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 9455735 PUBLICATION DATE: 08/15/2018
Name: CHINULNA POINT, COOK INLET
AK
NOAA Chart: 16662 Latitude: 60° 30.2' N ( 60.50330)
USGS Quad: Kenai C-4 Longitude: 151° 17.0' W (-151.28300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8 1974
MONUMENTATION: Survey disk VM#: 14171
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock OPUS PID:
LATITUDE: 60° 30.2' N ( 60.50330) LONGITUDE: 151° 17.0' W (-151.28300)
The bench mark is a disk set on a rock buried on the beach in front of a private
residence, approximately 113.0 m (370.7 ft) from the NW corner of a two-story
white house, and 12.0 m (39.4 ft) west of the base of a 6.00 m (19.7 ft) high
bluff.
BENCH MARK STAMPING: 5735 A 1995
DESIGNATION: 945 5735 A
MONUMENTATION: Survey disk VM#: 14172
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Granite boulder OPUS PID:
LATITUDE: 60° 30.2' N ( 60.50330) LONGITUDE: 151° 17.0' W (-151.28300)
The bench mark is a disk set on a 1.0 m x 2.0 m x 0.75 m (3.3 ft x 6.6 ft x 2.5
ft) granite boulder which is embedded in sand approximately 10.00 m (32.8 ft)
from the bluff, approximately 80.0 m (262.5 ft) from bench mark 8 1974, bearing
160 degrees per magnetic compass, and 110 m (361 ft) from tide staff (bearing 52
degrees).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 9455735 PUBLICATION DATE: 08/15/2018
Name: CHINULNA POINT, COOK INLET
AK
NOAA Chart: 16662 Latitude: 60° 30.2' N ( 60.50330)
USGS Quad: Kenai C-4 Longitude: 151° 17.0' W (-151.28300)
T I D A L D A T U M S
Tidal datums at CHINULNA POINT, COOK INLET based on:
LENGTH OF SERIES: 30 DAYS
TIME PERIOD: Jun 1 1995 - Jun 30 1995
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9455760 NIKISKI, COOK INLET
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 6.354
MEAN HIGH WATER MHW = 6.126
MEAN SEA LEVEL MSL = 3.475
MEAN TIDE LEVEL MTL = 3.385
MEAN LOW WATER MLW = 0.645
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4 1974 14.562 8.436
6 1974 14.967 8.841
8 1974 7.515 1.389
5735 A 1995 8.003 1.877
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 9455735 PUBLICATION DATE: 08/15/2018
Name: CHINULNA POINT, COOK INLET
AK
NOAA Chart: 16662 Latitude: 60° 30.2' N ( 60.50330)
USGS Quad: Kenai C-4 Longitude: 151° 17.0' W (-151.28300)
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.