U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9450625 PUBLICATION DATE: 09/05/2003 Name: LINDEMAN COVE AK NOAA Chart: 17426 Latitude: 55° 36.1' N ( 55.60170) USGS Quad: CRAIG (B-2) Longitude: 132° 30.7' W (-132.51200) To reach the tidal bench marks from Ketchikan, go NW 64.8 km (35 nm) to the northern-most extent of Kasaan Bay to Lindeman Cove. The tidal bench marks are located along the beach. The tide gauge was built at a new site on a sparcely wooded point immediately east of the entrance to Linderman Cove. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0625 C 2002 DESIGNATION: 945 0625 C MONUMENTATION: Tidal Station disk VM#: 16877 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 55° 36.1' N ( 55.60170) LONGITUDE: 132° 30.7' W (-132.51200) The primary bench mark is a disk set into the top of the third grey rock outcrop east of Linderman Cove, which outcrop marks the western-most point of the entrance to the first large bay east of Linderman Cove, 6.0 m (19.7 ft) north of seaward extent and 4.0 m (13.1 ft) from the west edge of the outcrop, 44.7 m (146.6 ft) NW of Bench Mark 0625 B 2002 and separated by rocky beach, 87.8 m (288.0 ft) NE to Bench Mark 0625 D 2002 and separated by a steep rock, 6.0 m (19.7 ft) south of tree line, and 3.0 m (9.8 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: 9450625 PUBLICATION DATE: 09/05/2003 Name: LINDEMAN COVE AK NOAA Chart: 17426 Latitude: 55° 36.1' N ( 55.60170) USGS Quad: CRAIG (B-2) Longitude: 132° 30.7' W (-132.51200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0625 A 2002 DESIGNATION: 945 0625 A MONUMENTATION: Tidal Station disk VM#: 16875 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 55° 36.2' N ( 55.60330) LONGITUDE: 132° 30.7' W (-132.51200) The bench mark is a disk set into the top of the south eastern-most extent of the first grey rock outcrop east of Linderman Cove, 6.00 m (19.7 ft) NNE of outcrop seaward extent, 29.9 m (98.1 ft) NW of Bench Mark 0625 B 2002 and separated by rocky beach, 4.0 m (13.1 ft) south of tree line, and 2.0 m (6.6 ft) above the apparent high water line. BENCH MARK STAMPING: 0625 B 2002 DESIGNATION: 945 0625 B MONUMENTATION: Tidal Station disk VM#: 16876 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 55° 36.2' N ( 55.60330) LONGITUDE: 132° 30.7' W (-132.51200) The bench mark is a disk set into the top of the second grey rock outcrop east of Linderman Cove, 8.0 m (26.3 ft) north of the seaward extent and 6.5 m (21.3 ft) from the east edge of the outcrop, 29.9 m (98.1 ft) SE of Bench Mark 0625 A 2002 and separated by rocky beach, 44.7 m (146.6 ft) SE to Bench Mark 0625 C 2002 and separated by rocky beach, 5.00 m (16.4 ft) SW of tree line, and 2.0 m (6.6 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: 9450625 PUBLICATION DATE: 09/05/2003 Name: LINDEMAN COVE AK NOAA Chart: 17426 Latitude: 55° 36.1' N ( 55.60170) USGS Quad: CRAIG (B-2) Longitude: 132° 30.7' W (-132.51200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0625 D 2002 DESIGNATION: 945 0625 D MONUMENTATION: Tidal Station disk VM#: 16878 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 55° 36.2' N ( 55.60330) LONGITUDE: 132° 30.6' W (-132.51000) The bench mark is a disk set in a flat ledge of a shear black rock outcrop that drops off to the south and east located at the head of the west side of the first large bay east of Linderman Cove, 2.32 m (7.6 ft) to tbe east and 4.20 m (13.8 ft) to the south edge of outcrop, 87.8 m (288.0 ft) SW to Bench Mark 0625 C 2002 and separated by a steep rock, 62.0 m (203.4 ft) ESE to Bench Mark 0625 E 2002 and separated by rocky beach, 26.0 m (85.3 ft) NE to treeline at head of bay, and 2.0 m (6.6 ft) above the apparent high water line. BENCH MARK STAMPING: 0625 E 2002 DESIGNATION: 945 2002 E MONUMENTATION: Tidal Station disk VM#: 16879 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 55° 36.2' N ( 55.60330) LONGITUDE: 132° 30.6' W (-132.51000) The bench mark is a disk set in top of the first grey rock outcrop east of the west side of the first large bay east of Linderman Cove, 7 m (23 ft) north of the seaward extent and 5.0 m (16.4 ft) from the east edge of the outcrop, 62.0 m (203.4 ft) WNW of Bench Mark 0625 D 2002 and separated by rocky beach, 2.0 m (6.6 ft) south of tree line, and 1.5 m (4.9 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: 9450625 PUBLICATION DATE: 09/05/2003 Name: LINDEMAN COVE AK NOAA Chart: 17426 Latitude: 55° 36.1' N ( 55.60170) USGS Quad: CRAIG (B-2) Longitude: 132° 30.7' W (-132.51200) T I D A L D A T U M S Tidal datums at LINDEMAN COVE based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: August 2002 - September 2002 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 = 4.802 MEAN HIGH WATER MHW = 4.528 MEAN TIDE LEVEL MTL = 2.505 MEAN SEA LEVEL MSL = 2.502 MEAN LOW WATER MLW = 0.483 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0625 C 2002 7.333 2.805 0625 A 2002 6.835 2.307 0625 B 2002 6.843 2.315 0625 D 2002 6.219 1.691 0625 E 2002 6.568 2.040
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9450625 PUBLICATION DATE: 09/05/2003 Name: LINDEMAN COVE AK NOAA Chart: 17426 Latitude: 55° 36.1' N ( 55.60170) USGS Quad: CRAIG (B-2) Longitude: 132° 30.7' W (-132.51200) 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.