U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) To reach the tidal bench marks from the Ralph Wien Memorial Airport (OTZ), proceed 1.6 km (1.0 mi) NE along Third Avenue, then proceed 243 m (797 ft) NW along Turf Street to the Crowley dock and tide station. The bench marks are located along Shore Avenue and Turf Street. The tide gauges and staff are located at the Header Fuel Pump in the middle of the Crowley dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: DESIGNATION: 949 0424 J MONUMENTATION: Metal Rod VM#: 15419 AGENCY: Alaska Department of Natural Resources (AKDNR) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 66° 54.2' N ( 66.90372) LONGITUDE: 162° 34.9' W (-162.58144) The primary bench mark is a metal rod set in the E corner of an empty lot sometimes used to store connexes, 45.79 m (150.2 ft) SSE of the NW edge of the Shore Avenue embankment, 40.79 m (133.8 ft) SSE of the centerline of Shore Avenue, 17.41 m (57.1 ft) NE of a steel stair case leading up to fuel tanks, 5.24 m (17.2 ft) W of the fence post corner bordering a private residence and Crowley fuel tank area, and 2.90 m (9.5 ft) SW of a power pole numbered 3A21. The datum point is set 25 cm (0.8 ft) below the top of the PVC pipe, being the top of a stainless steel rod driven 15.7 m (52 ft) to refusal, and encased in a 5-inch black PVC pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 949 0424 H MONUMENTATION: Flange-encased Rod VM#: 15417 AGENCY: Alaska Department of Natural Resources (AKDNR) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 66° 54.1' N ( 66.90211) LONGITUDE: 162° 34.9' W (-162.58233) The bench mark is a flange encased rod set beneath the E extent of Kotzebue High School, 45 m (147 ft) NW of the centerline of Third Avenue, 37 m (121 ft) SW of the centerline of Turf Street, 1.5 m (4.9 ft) S of the building corner, and 0.62 m (2.0 ft) SE of the SE face of the building. The datum point is set 10 cm (0.3 ft) below the top of the PVC pipe, being the top of a stainless steel rod driven 15.7 m (52 ft) and encased in a 0.13 m (0.4 ft) diameter black PVC pipe projecting above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 949 0424 I MONUMENTATION: Metal Rod VM#: 15418 AGENCY: Alaska Department of Natural Resources (AKDNR) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 66° 54.2' N ( 66.90378) LONGITUDE: 162° 35.0' W (-162.58356) The bench mark is a metal rod set in a small alcove between two warehouses facing Shore Avenue and the Crowley dock, 25.35 m (83.2 ft) ESE of the SE most yellow guard rail pillar near the fuel headers, 22.00 m (72.2 ft) SE of the sheet pile bulkhead of the dock, 10.05 m (33.0 ft) SSE of the centerline of Shore Avenue, 0.88 m (2.9 ft) SW of the NW corner of the E warehouse, and 0.79 m (2.6 ft) SE of the NE corner of the W warehouse. The datum point is set 20 cm (0.7 ft) below the top of the PVC pipe, being the top of a stainless steel rod driven 15.7 m (52 ft) to refusal, and encased in a 5-inch black PVC pipe. BENCH MARK STAMPING: 0424 K 2003 DESIGNATION: 949 0424 K TIDAL MONUMENTATION: Tidal Station disk VM#: 17453 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete utility box frame OPUS PID#: BBBH54 LATITUDE: 66° 54.1' N ( 66.90164) LONGITUDE: 162° 34.9' W (-162.58186) The bench mark is a disk set flush in the concrete box, 23.50 m (77.1 ft) SSW of the centerline of Turf Street, 9.70 m (31.8 ft) NE of a pedestrian crossing sign, 9.10 m (29.9 ft) WNW of the centerline of 3rd Street, 4.45 m (14.6 ft) WSW of the southern-most of four 0.17 m (0.6 ft) diameter x 1 m (3 ft) high bollards, 3.63 m (11.9 ft) SSW from a telephone pole, and 1.5 m (4.9 ft) ESE of a 0.63 m (2.1 ft) diameter manhole cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0424 L 2011 DESIGNATION: 949 0424 L MONUMENTATION: Tidal Station disk VM#: 20229 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 66° 54.2' N ( 66.90272) LONGITUDE: 162° 35.0' W (-162.58297) The bench mark is a disk set in a concrete pad in front of an overhead door for a Crowley building across Turf Street from the high school, 27.01 m (88.6 ft) NE of Turf Street, 10.18 m (33.4 ft) SSW of the W yellow guard rail pillar in front of 2000 gallon storage tank south of the Crowley building, 0.73 m (2.4 ft) N of the yellow guard rail next to the Crowley building, 0.40 m (1.3 ft) NW of the S corner of the Crowley building, and 0.29 m (0.9 ft) N of the S edge of the concrete pad in which the bench mark is set. BENCH MARK STAMPING: 0424 N 2015 DESIGNATION: 949 0424 N MONUMENTATION: Bench Mark disk VM#: 21806 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: BBDY64 LATITUDE: 66° 54.1' N ( 66.90158) LONGITUDE: 162° 35.4' W (-162.59044) The bench mark is a disk set in the N most semicircular pier of a seawall adjacent to Shore Avenue about 0.3 km (0.2 mi) S of the S end of the Crowley seawall, it is 40.15 m (131.7 ft) WSW of a street light at the NE corner of Shore Avenue and Ocean Drive, 31.10 m (102.0 ft) N of the NW corner of the residence at 705 Shore Avenue, 20.90 m (68.6 ft) NW of the first street light south of Ocean Drive on the E side of Shore Avenue, 10.80 m (35.4 ft) NW of the centerline of Shore Avenue, and 0.76 m (2.5 ft) SW of an inside corner of the seawall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) T I D A L D A T U M S Tidal datums at KOTZEBUE, KOTZEBUE SOUND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: July 2015 - September 2015 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9491094 RED DOG DOCK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.217 MEAN HIGH WATER MHW = 0.196 MEAN TIDE LEVEL MTL = 0.118 MEAN SEA LEVEL MSL = 0.103 MEAN LOW WATER MLW = 0.040 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 949 0424 J 2.043 1.847 949 0424 H 2.057 1.861 949 0424 I 2.111 1.915 0424 K 2003 1.830 1.634 0424 L 2011 1.992 1.796 0424 N 2015 2.197 2.001 Foot Notes: Bench mark 0424 N 2015 is based on one differential leveling connection and does not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9490424 PUBLICATION DATE: 04/13/2016 Name: KOTZEBUE, KOTZEBUE SOUND AK NOAA Chart: 16005 Latitude: 66° 54.1' N ( 66.90170) USGS Quad: KOTZEBUE (D-2) Longitude: 162° 34.9' W (-162.58200) 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.