U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) To reach the tidal bench marks by helicopter or small boat from Togiak Alaska, proceed southeasterly 45 km (28.0 mi) to right hand point, proceed around right hand point and continue northeasterly for 17.5 km (10.9 mi) to the east side of Kulukak Bay to Kukulak Point. If traveling by small boat, approach the point from the west. Many scattered rocks to the south of the point bare several feet above MLLW, with the largest and most prominent being the location of the primary bench mark. The bench marks are located in a 30 m (100 ft) by 40 m (130 ft) area at Kukulak Point. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5265 A 1985 DESIGNATION: 946 5265 A MONUMENTATION: Survey disk VM#: 15343 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 58° 50.4' N ( 58.83942) LONGITUDE: 159° 39.0' W (-159.65061) The primary bench mark is a disk set in bedrock at Kulukak point, in the center of an islet which connects to the mainland at the apparent low water, 27.43 m (90.0 ft) east of Kulukak point, 25.70 m (84.3 ft) west of bench mark 9465265 D, and 12.50 m (41.0 ft) SW of bench mark 9465265 B.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5265 B 1985 DESIGNATION: 946 5265 B MONUMENTATION: Survey disk VM#: 15344 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 58° 50.4' N ( 58.83950) LONGITUDE: 159° 39.0' W (-159.65042) The bench mark is a disk set in bedrock at the barnacle line, and 12.95 m (42.5 ft) NE (033 magnetic) from bench mark 946 5265 A, and 3.80 m (12.5 ft) SW of bench mark 946 5265 C BENCH MARK STAMPING: 5265 C 1985 DESIGNATION: 946 5265 C MONUMENTATION: Survey disk VM#: 15345 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 58° 50.4' N ( 58.83953) LONGITUDE: 159° 39.0' W (-159.65031) The bench mark is a disk set in bedrock, 15.80 m (51.8 ft) WNW of bench mark 9465265 D, 14.90 m (48.9 ft) WSW of BEND, 9.50 m (31.2 ft) ESE of bench mark 9465265 E, 4.21 m (13.8 ft) NE (030 magnetic) from bench mark 5265 B 1985, and approximately 3 m (10 ft) above the approximate high water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5265 D 1985 DESIGNATION: 946 5265 D MONUMENTATION: Survey disk VM#: 15346 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bedrock OPUS PID#: BBGN52 LATITUDE: 58° 50.4' N ( 58.83939) LONGITUDE: 159° 39.0' W (-159.65011) The bench mark is a disk set in bedrock at Kulukak point, located on a rock projection pointing south, 24.30 m (79.7 ft) ENE of the highest point of Tidal Rock Island on which bench mark 946 5265 A is set, 20.40 m (66.9 ft) west of the edge of grassy vegetation, 16.80 m (55.1 ft) east of bench mark 946 5265 B, 15.91 m (52.2 ft) SE (111 magnetic) from bench mark 946 5265 C. BENCH MARK STAMPING: 5265 E 1985 DESIGNATION: 946 5265 E MONUMENTATION: Survey disk VM#: 15347 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 58° 50.4' N ( 58.83956) LONGITUDE: 159° 39.0' W (-159.65042) The bench mark is a disk set in bedrock on a prominent rock outcropping on the tip of Kulukak point, 25.60 m (84.0 ft) NW of bench mark 946 5265 D, 9.50 m (31.2 ft) WNW of bench mark 946 5265 C, 6.63 m (21.8 ft) east of bench mark BEND, and 2.05 m (6.7 ft) SSW of an eye bolt set in a rock face.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BEND 1947 DESIGNATION: BEND MONUMENTATION: Bench Mark disk VM#: 23181 AGENCY: National Ocean Service IDB PID#: HZ2253 SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 58° 50.4' N ( 58.83958) LONGITUDE: 159° 39.0' W (-159.65061) The bench mark is a disk set in bedrock, 14.90 m (48.9 ft) ENE of bench mark 946 5265 C, 10.00 m (32.8 ft) SW of the GNSS-R station and 6.63 m (21.8 ft) west of bench mark 946 5265 E.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) T I D A L D A T U M S Tidal datums at KULUKAK POINT based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: August 2019 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9459450 SAND POINT, POPOF ISLAND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.450 MEAN HIGH WATER MHW = 2.964 MEAN TIDE LEVEL MTL = 1.850 MEAN SEA LEVEL MSL = 1.848 MEAN LOW WATER MLW = 0.736 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5265 A 1985 4.828 1.864 5265 B 1985 3.367 0.403 5265 C 1985 5.857 2.893 5265 D 1985 5.165 2.201 5265 E 1985 7.805 4.841 BEND 1947 9.857 6.893 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 6 of 6 Station ID: 9465265 PUBLICATION DATE: 11/23/2020 Name: KULUKAK POINT AK NOAA Chart: 16315 Latitude: 58° 50.4' N ( 58.84000) USGS Quad: NUSHAGAK BAY Longitude: 159° 38.8' W (-159.64700) 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.