U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9452123 PUBLICATION DATE: 07/02/2018 Name: TAKU HARBOR AK NOAA Chart: 17314 Latitude: 58° 4.1' N ( 58.06830) USGS Quad: Juneau A-1 Longitude: 134° 0.7' W (-134.01200) To reach the tidal bench marks proceed to Taku Harbor located on the east side of Stephens Passage south of Taku Inlet, continue into Taku Harbor to the floating dock at the NE end of the harbor. The bench marks are located along the shoreline and extend north and south from the end of the dock. The tide gage was mounted 3 m (10 ft) north of the end of the dock with the orifice attached to a piling on the north side of the dock. The staff was mounted on a piling on the north side of the dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1 DESIGNATION: 945 2123 1 MONUMENTATION: Tidal Station disk VM#: 9399 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock Outcrop OPUS PID: LATITUDE: 58° 4.1' N ( 58.06830) LONGITUDE: 134° 0.6' W (-134.01000) The primary bench mark is a disk set in the top of a large prominent rock 2 m x 2 m x 1 m (5 ft x 7 ft x 3 ft), SE of the ruins to the old cannery, 105 m (345 ft) NE of bench mark 4 1959, 21 m (70 ft) NE of the shoreline, 14 m (45 ft) ESE of a small conugated iron shed, 14 m (45 ft) WSW of the NW corner of the red shed, 5 m (18 ft) NW of the tree line, and 4.72 m (15.5 ft) NNW of the NW corner of a red one-room house.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9452123 PUBLICATION DATE: 07/02/2018 Name: TAKU HARBOR AK NOAA Chart: 17314 Latitude: 58° 4.1' N ( 58.06830) USGS Quad: Juneau A-1 Longitude: 134° 0.7' W (-134.01200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4 1959 DESIGNATION: 945 2123 4 1959 MONUMENTATION: Tidal Station disk VM#: 9400 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock Outcrop OPUS PID: LATITUDE: 58° 4.1' N ( 58.06830) LONGITUDE: 134° 0.6' W (-134.01000) The bench mark is a disk set in the top of a large mossey covered shale outcrop 2 m x 2 m x 2 m (5 ft x 7 ft x 5 ft) that juts from under west side of boardwalk, 27 m (88 ft) WSW from the SW corner of the first green shed south of the old cannery, 12 m (39 ft) north of the shoreline, 8 m (25 ft) inshore from the nearest row of pilings to an old dock, and 4 m (14 ft) south of the tree line. BENCH MARK STAMPING: 5 1959 DESIGNATION: 945 2123 5 1959 MONUMENTATION: Tidal Station disk VM#: 9401 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Grey Granite Boulder OPUS PID: LATITUDE: 58° 4.1' N ( 58.06830) LONGITUDE: 134° 0.6' W (-134.01000) The bench mark is a disk set in the top of the light gray granite boulder, 1 m x 2 m x 1 m (3 ft x 6 ft x 3 ft) located on the first point south of the ruins of the old cannery, 37 m (120 ft) SW of the SW corner of an old green house, 20 m (67 ft) NW of the tree line, 4 m (12 ft) WNW of the west point on the largest boulder on the beach, and 3 m (9 ft) NE of the shoreline.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9452123 PUBLICATION DATE: 07/02/2018 Name: TAKU HARBOR AK NOAA Chart: 17314 Latitude: 58° 4.1' N ( 58.06830) USGS Quad: Juneau A-1 Longitude: 134° 0.7' W (-134.01200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2123 A 1984 DESIGNATION: 945 2123 A 1984 MONUMENTATION: Tidal Station disk VM#: 9402 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 58° 4.1' N ( 58.06830) LONGITUDE: 134° 0.6' W (-134.01000) The bench mark is a disk set flush in a large concrete foundation at the head of the dock walkway, 23 m (77 ft) SE of bench mark 4 1959, 6 m (21 ft) south of the tree line, 5.58 m (18.3 ft) east of twin 0.61 m (2.0 ft) diameter fir trees, and 3 m (10 ft) NW of the shoreline. BENCH MARK STAMPING: 2123 B 1984 DESIGNATION: 945 2123 B 1984 MONUMENTATION: Tidal Station disk VM#: 9403 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock Outcrop OPUS PID: LATITUDE: 58° 4.1' N ( 58.06830) LONGITUDE: 134° 0.6' W (-134.01000) The bench mark is a disk set in the top of a rock outcrop, 72 m (237 ft) NE of bench mark 5 1959, 23 m (77 ft) SSE of the SW corner of an abandoned house on floats, 8 m (27 ft) east of the shoreline, 7 m (22 ft) west of the tree line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9452123 PUBLICATION DATE: 07/02/2018 Name: TAKU HARBOR AK NOAA Chart: 17314 Latitude: 58° 4.1' N ( 58.06830) USGS Quad: Juneau A-1 Longitude: 134° 0.7' W (-134.01200) T I D A L D A T U M S Tidal datums at TAKU HARBOR based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: May 1997 TIDAL EPOCH: 2012-2016 CONTROL TIDE STATION: 9452210 JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 4.810 MEAN HIGH WATER MHW = 4.542 MEAN SEA LEVEL MSL = 2.552 MEAN TIDE LEVEL MTL = 2.519 MEAN LOW WATER MLW = 0.496 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1 6.385 1.843 4 1959 4.973 0.431 5 1959 3.662 -0.880 2123 A 1984 4.416 -0.126 2123 B 1984 3.621 -0.921
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9452123 PUBLICATION DATE: 07/02/2018 Name: TAKU HARBOR AK NOAA Chart: 17314 Latitude: 58° 4.1' N ( 58.06830) USGS Quad: Juneau A-1 Longitude: 134° 0.7' W (-134.01200) 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.