U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9464961 PUBLICATION DATE: 03/19/2019 Name: CAPE CONSTANTINE, NUSHAGAK PENINSULA AK NOAA Chart: Latitude: 58° 31.3' N ( 58.52169) USGS Quad: Longitude: 159° 9.1' W (-159.15200) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4961 K 1986 DESIGNATION: 946 4961 K 1986 MONUMENTATION: Survey disk VM#: 15297 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Aluminum prefabricated pipe OPUS PID: LATITUDE: 58° 24.0' N ( 58.40000) LONGITUDE: 158° 55.0' W (-158.91700) The primary bench mark is a disk attached to the top of a 2-inch diameter aluminum prefabricated 1.22 m (4.0 ft) pipe mark, 182.88 m (600.0 ft) NE (050 magnetic) from bench mark 4961 L 1986, 62.12 m (203.8 ft) NE (062 magnetic) from bench mark 4961 G 1986, and 4.57 m (15.0 ft) inshore from the edge of the bluff which is 3.35 m (11.0 ft) high at this point and runs parallel to the beach. The bench mark is attached to the top of a 2-inch diameter aluminum prefabricated 1.22 m (4.0 ft) pipe mark that projects 0.27 m (0.9 ft) above natural grade, and set in soilcrete. BENCH MARK STAMPING: 4961 B 1985 DESIGNATION: 946 4961 B 1985 MONUMENTATION: Survey disk VM#: 15293 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 58° 24.0' N ( 58.40000) LONGITUDE: 158° 55.0' W (-158.91700) The bench mark is a disk attached to a 1/2-inch steel rod driven 1.83 m (6.0 ft) into the ground, 40.0 m (131.2 ft) inland of the bank that runs along the beach, 7.60 m (24.9 ft) west of a peat bog in a peat mound, and about 2.0 m (6.6 ft) above the approximate high water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9464961 PUBLICATION DATE: 03/19/2019 Name: CAPE CONSTANTINE, NUSHAGAK PENINSULA AK NOAA Chart: Latitude: 58° 31.3' N ( 58.52169) USGS Quad: Longitude: 159° 9.1' W (-159.15200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4961 G 1986 DESIGNATION: 946 4961 G 1986 MONUMENTATION: Survey disk VM#: 15294 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 58° 24.0' N ( 58.40000) LONGITUDE: 158° 55.0' W (-158.91700) The bench mark is a disk attached to the top of a stainless steel rod, 62.12 m (203.8 ft) NE (062 magnetic) from bench mark 4961 K 1986, 84.28 m (276.5 ft) NE (060 magnetic) from bench mark 4961 H 1986, and 22.86 m (75.0 ft) inshore from a steep bluff which runs parallel to the beach. The bench mark is flush with the natural grade, attached to the top of a stainless steel rod, driven 7.32 m (24.0 ft) to refusal, and protected by a 4-inch PVC pipe 0.3 m (1 ft) long projecting 0.06 m (0.2 ft) above natural grade and set in soilcrete. BENCH MARK STAMPING: 4961 H 1986 DESIGNATION: 946 4961 H 1986 MONUMENTATION: Survey disk VM#: 15295 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 58° 24.0' N ( 58.40000) LONGITUDE: 158° 55.0' W (-158.91700) The bench mark is a disk attached to the top of a stainless steel rod, 84.28 m (276.5 ft) NE (060 magnetic) from bench mark 4961 G 1986, 72.69 m (238.5 ft) NE (055 magnetic) from bench mark 4961 J 1986, and 45.72 m (150.0 ft) inshore from a steep bluff which runs parallel to the beach. The bench mark is flush with the natural grade, attached to the top of a stainless steel rod, driven 5.49 m (18.0 ft) to refusal, and protected by a 4-inch PVC pipe 0.3 m (1 ft) long projecting 0.06 m (0.2 ft) above natural grade and set in soilcrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9464961 PUBLICATION DATE: 03/19/2019 Name: CAPE CONSTANTINE, NUSHAGAK PENINSULA AK NOAA Chart: Latitude: 58° 31.3' N ( 58.52169) USGS Quad: Longitude: 159° 9.1' W (-159.15200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4961 J 1986 DESIGNATION: 946 4961 J 1986 MONUMENTATION: Survey disk VM#: 15296 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 58° 24.0' N ( 58.40000) LONGITUDE: 158° 55.0' W (-158.91700) The bench mark is a disk attached to the top of a stainless steel rod, 72.69 m (238.5 ft) NE (055 magnetic) from bench mark 4961 H 1986, NE (080 magnetic) from Round Island, and 68.58 m (225.0 ft) inshore from a steep bluff which runs parallel to the beach. The bench mark is flush with the natural grade, attached to the top of a stainless steel rod, driven 2.44 m (8.0 ft) to substantial resistance, and protected by a 4-inch PVC pipe 0.55 m (1.8 ft) long projecting 0.06 m (0.2 ft) above natural grade and set in soilcrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9464961 PUBLICATION DATE: 03/19/2019 Name: CAPE CONSTANTINE, NUSHAGAK PENINSULA AK NOAA Chart: Latitude: 58° 31.3' N ( 58.52169) USGS Quad: Longitude: 159° 9.1' W (-159.15200) T I D A L D A T U M S Tidal datums at CAPE CONSTANTINE, NUSHAGAK PENINSULA based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: July 1986 - July 1986 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9463502 PORT MOLLER, BRISTOL BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.400 MEAN HIGH WATER MHW = 3.072 MEAN SEA LEVEL MSL = 1.844 MEAN TIDE LEVEL MTL = 1.834 MEAN LOW WATER MLW = 0.596 MEAN LOWER LOW WATER MLLW = 0.000 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4961 K 1986 9.647 6.575 4961 B 1985 8.719 5.647 4961 G 1986 10.148 7.076 4961 H 1986 11.437 8.365 4961 J 1986 11.691 8.619 Foot Notes: Data from this station was collected using methodology that does not meet CO-OPS highest level of accuracy (no more than 10 cm, 95% Confidence Interval (CI) referenced to a tidal datum). Recognizing that lower quality data can be used for certain applications CO-OPS is making this data available to its users with restraint. The average six-minute water level observations derived from this system have an accuracy ranging from 10.0 - 30.0 cm, 95% CI on datum. Users are cautioned to consider the accuracy of these data before using them for critical navigational or coastal engineering purposes.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9464961 PUBLICATION DATE: 03/19/2019 Name: CAPE CONSTANTINE, NUSHAGAK PENINSULA AK NOAA Chart: Latitude: 58° 31.3' N ( 58.52169) USGS Quad: Longitude: 159° 9.1' W (-159.15200) 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.