U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) To reach the tidal bench marks site from Gambier Bay, approach Admiralty Island from the east and follow the channel northbound between Gain and Chapel Islands, maintain same course heading to reach the Cannery Wharf site on Admiralty Island. The station was located just south of a stream and approximately 100 m (328 ft) NE of the first rocky point west of the sandy bight. The tide gage and bench marks were located in the vicinity along the coast. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1906 A 1995 DESIGNATION: 945 1906 A MONUMENTATION: Tidal Station disk VM#: 13598 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock outcrop OPUS PID: LATITUDE: 57° 29.0' N ( 57.48330) LONGITUDE: 133° 57.6' W (-133.96000) The primary bench mark is a disk set on the north edge of a bedrock outcrop, south of the pier ruins, pebble beach and the stream, north of the water tank foundation ruins, 23 m (76 ft) north (000 degrees magnetic) from bench mark 945 1906 TIDAL 1, and 3 m (10 ft) seaward of the tree line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1906 B 1995 DESIGNATION: 945 1906 B MONUMENTATION: Tidal Station disk VM#: 13599 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 57° 29.0' N ( 57.48330) LONGITUDE: 133° 57.6' W (-133.96000) The bench mark is a disk set in bedrock just seaward of tree line, the first rocky point after bite SE (120 degrees magnetic), and 72 m (236 ft) south (180 degrees magnetic) from bench mark 945 1906 TIDAL 4. Note: Bench marks 1906 B 1995 and 945 1906 TIDAL 4 are not visible from each other.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 945 1906 TIDAL 1 ALIAS: NO 1 1913 MONUMENTATION: Bolt VM#: 13600 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock ledge OPUS PID: LATITUDE: 57° 29.0' N ( 57.48330) LONGITUDE: 133° 57.6' W (-133.96000) The bench mark is a copper bolt set in a prominent rocky ledge which lies about 50 m (165 ft) south from cannery wharf ruins, 329 m (1080 ft) NE of first rocky point west of sandy bight, and 12 m (40 ft) from the tree line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 945 1906 TIDAL 4 ALIAS: NO 4 1920 MONUMENTATION: Tidal Station disk VM#: 13601 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 57° 29.0' N ( 57.48330) LONGITUDE: 133° 57.6' W (-133.96000) The bench mark is a disk set in flat-topped rock at the tree line, 229 m (750 ft) NE of first rocky point west of sandy bight and on range with left tangent of first rocky point west of bight and left tangent of Muse Island. BENCH MARK STAMPING: 5 1925 DESIGNATION: 945 1906 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 13602 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock ledge OPUS PID: LATITUDE: 57° 29.0' N ( 57.48330) LONGITUDE: 133° 57.6' W (-133.96000) The bench mark is a disk set in top of a rock ledge, 320 m (1050 ft) NE of first point west of sandy bight at tree line, 9 m (30 ft) south of bench mark 945 1906 TIDAL 1, and 4 m (12 ft) east of NE corner of water tank foundation.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) T I D A L D A T U M S Tidal datums at CANNERY WHARF, GAMBIER BAY based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: April 1995 - May 1995 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9450460 KETCHIKAN, TONGASS NARROWS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 4.597 MEAN HIGH WATER MHW = 4.319 MEAN SEA LEVEL MSL = 2.427 MEAN TIDE LEVEL MTL = 2.395 MEAN LOW WATER MLW = 0.470 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1906 A 1995 5.968 1.649 1906 B 1995 5.535 1.216 945 1906 TIDAL 1 6.809 2.490 945 1906 TIDAL 4 6.168 1.849 5 1925 6.185 1.866
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9451906 PUBLICATION DATE: 08/03/2004 Name: CANNERY WHARF, GAMBIER BAY AK NOAA Chart: 17362 Latitude: 57° 29.0' N ( 57.48330) USGS Quad: SUMDUM (B-6) Longitude: 133° 57.6' W (-133.96000) 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.