U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9455732 PUBLICATION DATE: 08/22/2018 Name: KALIGAN ISLAND (NORTH END), COOK INLET AK NOAA Chart: 16662 Latitude: 60° 30.7' N ( 60.51170) USGS Quad: KENAI B-6 Longitude: 151° 57.1' W (-151.95200) To reach the tidal bench marks and North Kalgin Island Tide Station, from Kenai head west out of the Kenai River into Cook Inlet. Continue west across Cook Inlet to the NW end of Kalgin Island. The tide station was located on the tip of the Northwest Point on the NE side of Cobb Cove. The bench marks were located in the vicinity. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5732 B 1999 DESIGNATION: 945 5732 B MONUMENTATION: Bench Mark disk VM#: 15972 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 30.5' N ( 60.50830) LONGITUDE: 151° 56.9' W (-151.94800) The primary bench mark is a disk set in a boulder on the NW side of a rocky beach, located SE (120 magnetic) from two large offshore boulders, 42 m (138 ft) SE (165 magnetic) from bench mark 5732 C 1999, 40 m (131ft) NE (039 magnetic) from bench mark 5732 A 1999, approximately 3 m (10 ft) below vegetation line, and approximately 2 m (7 ft) above the apparent high water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9455732 PUBLICATION DATE: 08/22/2018 Name: KALIGAN ISLAND (NORTH END), COOK INLET AK NOAA Chart: 16662 Latitude: 60° 30.7' N ( 60.51170) USGS Quad: KENAI B-6 Longitude: 151° 57.1' W (-151.95200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5732 A 1999 DESIGNATION: 945 5732 A MONUMENTATION: Bench Mark disk VM#: 15971 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 30.5' N ( 60.50830) LONGITUDE: 151° 56.9' W (-151.94800) The bench mark is a disk set in the largest boulder on the beach, set in a flat spot 1 m (3 ft) from the top of the boulder, 40 m (131ft) SW (219 magnetic) from bench mark 5732 B 1999, 31 m (102 ft) NW (332 magnetic) from bench mark 5732 E 1999, approximately 2 m (7 ft) below vegetation line and approximately 1 m (3 ft) above the apparent high water line. BENCH MARK STAMPING: 5732 C 1999 DESIGNATION: 945 5732 C MONUMENTATION: Bench Mark disk VM#: 15973 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 30.5' N ( 60.50830) LONGITUDE: 151° 56.9' W (-151.94800) The bench mark is a disk set in a large prominent boulder on the north side of a rocky beach, located directly inshore of the largest exposed offshore rock, 120 m (394 ft) NW (275 magnetic) from bench mark 5732 D 1999, 42 m (138 ft) NW (345 magnetic) from bench mark 5732 B 1999, approximately 2 m (7 ft) below vegetation line, and approximately 2 m (7 ft) above the apparent high water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9455732 PUBLICATION DATE: 08/22/2018 Name: KALIGAN ISLAND (NORTH END), COOK INLET AK NOAA Chart: 16662 Latitude: 60° 30.7' N ( 60.51170) USGS Quad: KENAI B-6 Longitude: 151° 57.1' W (-151.95200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5732 D 1999 DESIGNATION: 945 5732 D MONUMENTATION: Bench Mark disk VM#: 15974 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 30.5' N ( 60.50830) LONGITUDE: 151° 56.9' W (-151.94800) The bench mark is a disk set in a boulder at the vegetation line on a pebble beach, located directly inshore of a 6 m x 3 m (20 ft x 10 ft) boulder, 120 m (394 ft) SE (095 magnetic) from bench mark 5732 C 1999, and approximately 3 m (10 ft) above the apparent high water line. BENCH MARK STAMPING: 5732 E 1999 DESIGNATION: 945 5732 E MONUMENTATION: Bench Mark disk VM#: 15975 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 30.5' N ( 60.50830) LONGITUDE: 151° 56.9' W (-151.94800) The bench mark is a disk set in a 2 m x 1 m (7 ft x 3 ft) boulder at the vegetation line on the SE end of a rocky beach, 31 m (102 ft) SE (152 magnetic) from bench mark 5732 A 1999, and approximately 3 m (10 ft) above the apparent high water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9455732 PUBLICATION DATE: 08/22/2018 Name: KALIGAN ISLAND (NORTH END), COOK INLET AK NOAA Chart: 16662 Latitude: 60° 30.7' N ( 60.51170) USGS Quad: KENAI B-6 Longitude: 151° 57.1' W (-151.95200) T I D A L D A T U M S Tidal datums at KALIGAN ISLAND (NORTH END), COOK INLET based on: LENGTH OF SERIES: 30 DAYS TIME PERIOD: Jul 19 1999 - Aug 17 1999 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 = 5.707 MEAN HIGH WATER MHW = 5.475 MEAN SEA LEVEL MSL = 3.101 MEAN TIDE LEVEL MTL = 3.040 MEAN LOW WATER MLW = 0.605 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5732 B 1999 9.146 3.672 5732 A 1999 7.335 1.861 5732 C 1999 8.237 2.763 5732 D 1999 8.565 3.090 5732 E 1999 7.949 2.474
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9455732 PUBLICATION DATE: 08/22/2018 Name: KALIGAN ISLAND (NORTH END), COOK INLET AK NOAA Chart: 16662 Latitude: 60° 30.7' N ( 60.51170) USGS Quad: KENAI B-6 Longitude: 151° 57.1' W (-151.95200) 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.