U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9458917 PUBLICATION DATE: 03/22/2005 Name: CHIGNIK, ANCHORAGE BAY AK NOAA Chart: 16566 Latitude: 56° 17.8' N ( 56.29670) USGS Quad: CHIGNIK (B-2) Longitude: 158° 24.0' W (-158.40000) To reach tidal bench marks from Alaskan Peninsula, go to the town of Chignik, Anchorage Bay. The bench marks and gauge were located on the premises of the Aleutian Dragon Fisheries cannery. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: S-1066 ATS 63 COR 4 WCMC S-2149 1962 6ZE DESIGNATION: 945 8917 COR 4 ALIAS: 9 1964 MONUMENTATION: Tidal Station disk VM#: 13156 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel pipe OPUS PID#: BBDW14 LATITUDE: 56° 17.8' N ( 56.29670) LONGITUDE: 158° 24.0' W (-158.40000) The primary bench mark is a disk set in a steel pipe at the end of a wooden sidewalk, 3 m (10 ft) north of the NE corner of a trailer which is the western-most of a row of trailers located between the shore and a slough, and 0.34 m (1.1 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9458917 PUBLICATION DATE: 03/22/2005 Name: CHIGNIK, ANCHORAGE BAY AK NOAA Chart: 16566 Latitude: 56° 17.8' N ( 56.29670) USGS Quad: CHIGNIK (B-2) Longitude: 158° 24.0' W (-158.40000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8917 F 1996 DESIGNATION: 945 8917 F MONUMENTATION: Tidal Station disk VM#: 13157 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Pavement OPUS PID: LATITUDE: 56° 17.8' N ( 56.29670) LONGITUDE: 158° 24.0' W (-158.40000) The bench mark is a disk set flush in the pavement outside the NE-SW running cannery wall, and 21 m (69 ft) south of the NW corner of the ADF cannery building. BENCH MARK STAMPING: 8917 G 1996 DESIGNATION: 945 8917 G MONUMENTATION: Tidal Station disk VM#: 13158 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Pavement OPUS PID: LATITUDE: 56° 17.8' N ( 56.29670) LONGITUDE: 158° 24.0' W (-158.40000) The bench mark is a disk set flush in the pavement, 40 m (131 ft) NW of bench mark 8917 F 1996, 20 m (66 ft) NE of the ADF administration building, 10 m (33 ft) from the apparent high water line, and 4 m (13 ft) NE of the ADF cannery building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9458917 PUBLICATION DATE: 03/22/2005 Name: CHIGNIK, ANCHORAGE BAY AK NOAA Chart: 16566 Latitude: 56° 17.8' N ( 56.29670) USGS Quad: CHIGNIK (B-2) Longitude: 158° 24.0' W (-158.40000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8917 H 1996 DESIGNATION: 945 8917 H MONUMENTATION: Tidal Station disk VM#: 13159 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 56° 17.8' N ( 56.29670) LONGITUDE: 158° 24.0' W (-158.40000) The bench mark is a disk set flush in the sidewalk located in front of the ADF net house facing the water, 50 m (164 ft) NW of bench mark 8917 G 1996, and 20 m (66 ft) from the apparent high water line. BENCH MARK STAMPING: 8917 I 1996 DESIGNATION: 945 8917 I MONUMENTATION: Tidal Station disk VM#: 13160 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 56° 17.8' N ( 56.29670) LONGITUDE: 158° 24.0' W (-158.40000) The bench mark is a disk set flush at the end of a paved sidewalk and at the start of a wooden sidewalk that runs between the shore and a row of trailers, 30 m (98 ft) NW of bench mark 8917 H 1996, 20 m (66 ft) from the apparent high water line, and 4 m (13 ft) NE of the NE corner of a gray aluminum building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9458917 PUBLICATION DATE: 03/22/2005 Name: CHIGNIK, ANCHORAGE BAY AK NOAA Chart: 16566 Latitude: 56° 17.8' N ( 56.29670) USGS Quad: CHIGNIK (B-2) Longitude: 158° 24.0' W (-158.40000) T I D A L D A T U M S Tidal datums at CHIGNIK, ANCHORAGE BAY based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: July 1996 - July 1996 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9459450 SAND POINT, POPOF ISLAND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (07/31/1996) = 3.096 MEAN HIGHER HIGH WATER MHHW = 2.722 MEAN HIGH WATER MHW = 2.477 MEAN TIDE LEVEL MTL = 1.459 MEAN SEA LEVEL MSL = 1.432 MEAN LOW WATER MLW = 0.441 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (07/01/1996) = -1.032 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW S-1066 ATS 63 COR 4 WCMC S-2149 1962 6ZE 5.732 3.256 8917 F 1996 6.113 3.636 8917 G 1996 5.967 3.490 8917 H 1996 6.266 3.789 8917 I 1996 6.108 3.631
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9458917 PUBLICATION DATE: 03/22/2005 Name: CHIGNIK, ANCHORAGE BAY AK NOAA Chart: 16566 Latitude: 56° 17.8' N ( 56.29670) USGS Quad: CHIGNIK (B-2) Longitude: 158° 24.0' W (-158.40000) 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.