U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) To reach the tidal bench marks from the Port Heiden Airport, proceed SE on Lower Site Road for 0.7 km (0.4 mi) to the intersection with Airport Road, turn right and continue SW on Airport Road for 6.2 km (3.9 mi) to its termination at the ocean at the far south end of old Meshik Village. The bench marks are in the vicinity of old Meshik Village on the southern end of town. The tide gauge was located at the end of Airport Road. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4075 B 2013 DESIGNATION: 946 4075 B MONUMENTATION: Flange-encased Rod VM#: 22541 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDG96 LATITUDE: 56° 54.5' N ( 56.90864) LONGITUDE: 158° 41.0' W (-158.68350) The primary benchmark is a flange-encased rod set near the southern end of the old Meshik Village, 93 m (305 ft) ESE of the high water and cliff line, 72.72 m (238.6 ft) SSW of benchmark 946 4075 C, 66.15 m (217.0 ft) ENE of benchmark 946 4075 A, 45.46 m (149.1 ft) SW of the SW corner of a shed to the south of the red building with a fuel tank, and 40.69 m (133.5 ft) SE of the NE corner of a concrete slab fuel tank foundation with no tank. The datum point is set 10 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 19.5 m (64.0 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in an 8-inch National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4075 A 2013 DESIGNATION: 946 4075 A MONUMENTATION: Flange-encased Rod VM#: 22542 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 56° 54.5' N ( 56.90828) LONGITUDE: 158° 41.1' W (-158.68439) The benchmark is a flange-enased rod set near the southern end of the old Meshik Village, 66.15 m (217.0 ft) WSW of benchmark 946 4075 B, 62.68 m (205.6 ft) SSE of the NE corner of a concrete slab in the middle of the road, 49 m (161 ft) ESE of the high water and cliff line, and 6.34 m (20.8 ft) NNW of the southernmost edge of a mound which the benchmark is set on. The datum point is set 10 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 18.3 m (60.0 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in an 8-inch National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4075 C 2013 DESIGNATION: 946 4075 C MONUMENTATION: Flange-encased Rod VM#: 22543 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 56° 54.6' N ( 56.90928) LONGITUDE: 158° 41.0' W (-158.68325) The benchmark is a flange-encased rod set north of an intersection of two gravel driveways in the old Meshik Village, 105 m (344 ft) ESE of the high water and cliff line, 75.59 m (248.0 ft) NW of benchmark 946 4075 D, 72.72 m (238.6 ft) NNE of benchmark 946 4075 B, 72.64 m (238.3 ft) SSW of the SE corner of a teal house, 33.62 m (110.3 ft) NW of the NW corner of a red house, and 9.75 m (32.0 ft) NNE of the gravel edge of the driveway. The datum point is set 10 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 18.3 m (60.0 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in an 8-inch National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4075 D 2013 DESIGNATION: 946 4075 D MONUMENTATION: Flange-encased Rod VM#: 22544 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 56° 54.5' N ( 56.90875) LONGITUDE: 158° 40.9' W (-158.68242) The benchmark is a flange-encased rod set at the southern end of the old Meshik Village, 84.42 m (277.0 ft) WSW of benchmark 946 4075 E, 75.59 m (248.0 ft) SE of benchmark 946 4075 C, 30.77 m (101.0 ft) SSE of the SE corner of a red house, 29.72 m (97.5 ft) SE of the NE corner of a wooden shed south of the red house, and 6.83 m (22.4 ft) north of the southernmost edge of the tundra mound on which the benchmark is set. The datum point is set 10 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 18.3 m (60.0 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in an 8-inch National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4075 E 2013 DESIGNATION: 946 4075 E MONUMENTATION: Flange-encased Rod VM#: 22545 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 56° 54.5' N ( 56.90906) LONGITUDE: 158° 40.9' W (-158.68114) The benchmark is a flange-encased rod set at the southeastern end of the old Meshik Village, 84.42 m (277.0 ft) ENE of benchmark 946 4075 D, 52.25 m (171.4 ft) SE of the southernmost corner of a blue house, 51.89 m (170.2 ft) SSE of the SE corner of a blue house, 18.80 m (61.7 ft) SSW of the Goldfish Lake high water mark. The datum point is set 11 cm (0.4 ft) below grade, being the top of a stainless steel rod driven 18.3 m (60.0 ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in an 8-inch National Ocean Service logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) T I D A L D A T U M S Tidal datums at MESHIK, PORT HEIDEN based on: LENGTH OF SERIES: 30 DAYS TIME PERIOD: Sep 12 2013 - Oct 11 2013 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 = 3.540 MEAN HIGH WATER MHW = 3.186 MEAN SEA LEVEL MSL = 1.958 MEAN TIDE LEVEL MTL = 1.946 MEAN LOW WATER MLW = 0.707 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4075 B 2013 8.277 5.092 4075 A 2013 7.851 4.666 4075 C 2013 7.515 4.329 4075 D 2013 7.597 4.411 4075 E 2013 7.176 3.991
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9464075 PUBLICATION DATE: 01/04/2018 Name: MESHIK, PORT HEIDEN AK NOAA Chart: 16343 Latitude: 56° 54.5' N ( 56.90825) USGS Quad: CHIGNIK D-3 Longitude: 158° 41.1' W (-158.68492) 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.