U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9466328 PUBLICATION DATE: 03/09/2011 Name: LOMAVIK, AK AK NOAA Chart: 16304 Latitude: 60° 33.3' N ( 60.55428) USGS Quad: BAIRD INLET (A-2) Longitude: 162° 17.8' W (-162.29714) To reach the tidal bench marks from the Bethel, proceed by charter float plane 39 km (24 mi) SW to a small slough on the west bank of the Kuskokwim River, taxi 0.3 km (0.2 mi) south along the bank of the Kuskokwim River. The bench marks are located between 20 m and 150 m from the river bank. The tide gauges were located approximate 50 m (164 ft) offshore. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6328 A 2010 DESIGNATION: 946 6328 A MONUMENTATION: Metal Rod VM#: 19673 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 60° 33.3' N ( 60.55444) LONGITUDE: 162° 17.8' W (-162.29625) The primary bench mark is set on the west bank of the Kuskokwim River, 66.43 m (217.8 ft) north of bench mark 946 6328 C, 32.50 m (106.6 ft) WNW of the bank of the Kuskokwim River, and 12.65 m (41.5 ft) south of a small drainage creek that trickles into the Kuskokwim River. The datum point is set 0.09 m (0.3 ft) below grade, being the top of a rounded off stainless steel rod with a punch mark driven 6.1 m (20 ft) to refusal and encased in a NGS Geodetic Control Mark Logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9466328 PUBLICATION DATE: 03/09/2011 Name: LOMAVIK, AK AK NOAA Chart: 16304 Latitude: 60° 33.3' N ( 60.55428) USGS Quad: BAIRD INLET (A-2) Longitude: 162° 17.8' W (-162.29714) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6328 B 2010 DESIGNATION: 946 6328 B MONUMENTATION: Metal Rod VM#: 19674 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBBZ38 LATITUDE: 60° 33.3' N ( 60.55419) LONGITUDE: 162° 17.8' W (-162.29736) The bench mark is set on the west bank of the Kuskokwim River, 71.47 m (234.5 ft) WSW of bench mark 946 6328 A, 60.06 m (198.8 ft) WNW of bench mark 946 6328 C, and 16.83 m (55.2 ft) north of a line an alders that run east/west. The datum point is set 0.09 m (0.3 ft) below grade, being the top of a rounded off stainless steel rod with a punch mark driven 10.9 m (36 ft) to refusal and encased in a NGS Geodetic Mark Logo Cover. BENCH MARK STAMPING: 6328 C 2010 DESIGNATION: 946 6328 C MONUMENTATION: Metal Rod VM#: 19675 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 60° 33.2' N ( 60.55386) LONGITUDE: 162° 17.8' W (-162.29636) The bench mark is set on the west bank of the Kuskokwim River, 61.00 m (200.1 ft) NE of bench mark 946 6328 D, 60.06 m (198.8 ft) ESE of bench mark 946 6328 B, 28.79 m (94.5 ft) east of the edge of alders running east/west along another slightly larger drainage creek that runs between benchmarks 946 6328 C and 946 6328 D and flows into the Kuskokwim River, and 23.50 m (77.1 ft) north of the outlet of the same slightly larger drainage creek. The datum point is set 0.10 m (0.3 ft) below grade, being the top of a rounded off stainless steel rod with a punch mark driven 15.8 m (52 ft) to refusal and encased in a NGS Geodetic Control Mark Logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9466328 PUBLICATION DATE: 03/09/2011 Name: LOMAVIK, AK AK NOAA Chart: 16304 Latitude: 60° 33.3' N ( 60.55428) USGS Quad: BAIRD INLET (A-2) Longitude: 162° 17.8' W (-162.29714) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6328 D 2010 DESIGNATION: 946 6328 D MONUMENTATION: Metal Rod VM#: 19676 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 60° 33.2' N ( 60.55353) LONGITUDE: 162° 17.8' W (-162.29736) The bench mark is set on the west bank of the Kuskowkim River, 61.00 m (200.1 ft) SW of bench mark 946 6328 C, 55.02 m (180.5 ft) east of bench mark 946 6328 E, 52.40 m (171.9 ft) west of the bank of the Kuskokwim River, and 33.70 m (110.6 ft) south of a driftwood debris pile near a line of alders running east/west. The datum point is set 0.07 m (0.2 ft) below grade, being the top of a rounded off stainless steel rod with a punch mark driven 12.2 m (39.9 ft) to refusal and encased in a NGS Geodetic Control Mark Logo cover. BENCH MARK STAMPING: 6328 E 2010 DESIGNATION: 946 6328 E MONUMENTATION: Metal Rod VM#: 19677 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 60° 33.2' N ( 60.55356) LONGITUDE: 162° 17.9' W (-162.29828) The bench mark is set on the west bank of the Kuskokwim River, 55.70 m (182.7 ft) NW of the grass edge of small bay south of the slightly larger drainage creek, 55.02 m (180.5 ft) west of bench mark 946 6328 D, and 46.90 m (153.9 ft) SE of SW point of large driftwood pile congrated near a line of alders. The datum point is set 0.07 m (0.2 ft) below grade, being the top of a rounded off stainless steel rod with a punch mark driven 12.2 m (40.0 ft) to refusal and encased in a NGS Geodetic Control Mark Logo. cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9466328 PUBLICATION DATE: 03/09/2011 Name: LOMAVIK, AK AK NOAA Chart: 16304 Latitude: 60° 33.3' N ( 60.55428) USGS Quad: BAIRD INLET (A-2) Longitude: 162° 17.8' W (-162.29714) T I D A L D A T U M S Tidal datums at LOMAVIK, AK based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: July 2010 - August 2010 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.415 MEAN HIGH WATER MHW = 1.933 MEAN SEA LEVEL MSL = 1.183 MEAN TIDE LEVEL MTL = 1.073 MEAN LOW WATER MLW = 0.213 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6328 A 2010 2.453 0.520 6328 B 2010 2.492 0.559 6328 C 2010 2.523 0.590 6328 D 2010 2.520 0.587 6328 E 2010 2.475 0.542
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9466328 PUBLICATION DATE: 03/09/2011 Name: LOMAVIK, AK AK NOAA Chart: 16304 Latitude: 60° 33.3' N ( 60.55428) USGS Quad: BAIRD INLET (A-2) Longitude: 162° 17.8' W (-162.29714) 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.