U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
To reach the tidal bench marks from the Ninilchik Post Office, proceed north on
Kingsley Road for 0.33 km (0.2 mi) to the Sterling Highway, then proceed NE on
the Sterling Highway for 0.43 km (0.3 mi) to Beach Access Road (Mission Avenue),
turn left on Beach Access Road and proceed 0.31 km (0.2 mi) to the intersection
of Mission Ave and Airport Lane, stay left and proceed 1.21 km (0.7 mi) on
Airport Lane to its termination at the mouth of Ninilchik Harbor. The bench
marks are located on Airport Lane between the jetty and the public restrooms at
the south end of airport lane. The staff was located on a piling at the north
end of the harbor. The gauges were located 2.6 km (1.6 mi) NW of the entrance of
Ninilchik Harbor.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5653 A 1979
DESIGNATION: 945 5653 A
MONUMENTATION: Survey disk VM#: 14156
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete Slab OPUS PID:
LATITUDE: 60° 3.2' N ( 60.05289) LONGITUDE: 151° 40.0' W (-151.66717)
The primary bench mark is a brass disk set flush in the NW corner of the Icicle
Seafood tool shed s concrete foundation, 14.40 m (47.2 ft) south of the road
sign at the intersection of the boat ramp access road and Airport Lane, 14.10 m
(46.3 ft) NE of the SW corner of the tool shed s concrete foundation, and 9.25 m
(30.3 ft) NW of the NE corner of the tool shed s concrete foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5653 D 1979
DESIGNATION: 945 5653 D
MONUMENTATION: Survey disk VM#: 14159
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete Slab OPUS PID:
LATITUDE: 60° 3.2' N ( 60.05281) LONGITUDE: 151° 40.0' W (-151.66725)
The bench mark is a brass disk set flush in the concrete slab supporting a green
transformer in front of Icicle Seafood s Office, 10.60 m (34.8 ft) WSW of the
center of the blue Icicle Seafood s office door, 9.63 m (31.6 ft) NW of a
wooden water tank, 8.70 m (28.5 ft) SE of the SW corner of the tool shed, and
0.13 m (0.4 ft) above grade.
BENCH MARK STAMPING: NO STAMPING
DESIGNATION: 945 5653 E
ALIAS:
MONUMENTATION: Metal Rod VM#: 14160
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Rod drilled in rock OPUS PID:
LATITUDE: 60° 3.3' N ( 60.05436) LONGITUDE: 151° 39.9' W (-151.66522)
The bench mark is a bronze rod cemented in a large rip rap boulder which makes
up part of the southern jetty in the Ninilchik Harbor entrance, 30.40 m (99.7
ft) NNW of the NW corner of the northern dock, 26.73 m (87.7 ft) ESE of USACE
benchmark NINIL 2, 6.43 m (21.1 ft) east of a NO PARKING sign at the end of
Airport Lane, 1.94 m (6.4 ft) NW of the inside edge of the breakwater, and 0.70
m (2.30 ft) below the grade of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5653 F 2011
DESIGNATION: 945 5653 F
MONUMENTATION: Metal Rod VM#: 20900
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBCM32
LATITUDE: 60° 3.1' N ( 60.05142) LONGITUDE: 151° 40.1' W (-151.66903)
The bench mark is a stainless steel rod set at the north end of a 0.61 m (2 ft)
high by 3-inch steel pipe guard rail running parallel to Airport Lane, 8.10 m
(26.6 ft) NE of a ONE LANE ROAD NEXT 200 FT road sign, 6.00 m (19.7 ft) SE of
the center of Airport Lane, 2.34 m (7.7 ft) SE of the SW corner Icicle Seafood s
property fence, and 0.37 m (1.2 ft) NW of the steel guard rail. The datum point
is set 7 cm (0.2 ft) below ground, being the top of a stainless steel rod driven
29.09 m (95.4 ft) to substantial resistance and encased in a 6-inch PVC pipe
with NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5653 G 2011
DESIGNATION: 945 5653 G
MONUMENTATION: Metal Rod VM#: 20901
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBFH77
LATITUDE: 60° 3.1' N ( 60.05097) LONGITUDE: 151° 40.2' W (-151.66958)
The bench mark is a stainless steel rod set at the north end of a 0.61 m (2 ft)
high 3-inch steel pipe guard rail running parallel to Airport Lane, 18.26 m
(59.9 ft) north of the north corner of the Beachcomber Motel and RV office
building, 5.80 m (19.0 ft) SE of the center of Airport Lane, 5.37 m (17.6 ft) NE
of the southern end of the steel rail, 1.60 m (5.2 ft) NE of a No Parking on
Roadway road sign, and 0.32 m (1.1 ft) NE of the steel guard rail. The datum
point is set 8 cm (0.3 ft) below ground, being the top of a stainless steel rod
driven 6.96 m (22.8 ft) to refusal and encased in a 6-inch PVC pipe with NOS
logo cap.
BENCH MARK STAMPING: 5653 H 1979
DESIGNATION: 945 5653 H
MONUMENTATION: Survey disk VM#: 20902
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete Slab OPUS PID:
LATITUDE: 60° 2.9' N ( 60.04853) LONGITUDE: 151° 40.3' W (-151.67086)
The bench mark is a brass disk set flush in a concrete slab supporting the
southernmost outdoor restroom at the access to the beach, 10.67 m (35.0 ft) SW
of the NW rail post at the bottom of the wooden stairs leading up the bluff to
the Ninilchik View Campground, 4.91 m (16.1 ft) west of the east edge of the
concrete slab, 0.82 m (2.7 ft) east of the SE corner of the southernmost
restroom, and 0.18 m (0.6 ft) north of the south edge of the concrete slab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
T I D A L D A T U M S
Tidal datums at NINILCHIK, COOK INLET based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: Sep 1 2011 - Sep 30 2011
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9455500 SELDOVIA, COOK INLET
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 5.838
MEAN HIGH WATER MHW = 5.622
MEAN SEA LEVEL MSL = 3.135
MEAN TIDE LEVEL MTL = 3.109
North American Vertical Datum NAVD88 = 1.890
MEAN LOW WATER MLW = 0.595
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5653 A 1979 9.761 4.139
5653 D 1979 8.973 3.351
NO STAMPING 9.331 3.709
5653 F 2011 8.990 3.368
5653 G 2011 9.075 3.453
5653 H 1979 11.072 5.450
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9455653 PUBLICATION DATE: 04/09/2018
Name: NINILCHIK, COOK INLET
AK
NOAA Chart: 16661 Latitude: 60° 3.3' N ( 60.05500)
USGS Quad: KENAI A-5 SE Longitude: 151° 40.9' W (-151.68200)
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.