U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) To reach the tide station from the Port Moller Hotel, proceed 186 m (610 ft) ESE (120 T) to the end of the dock, turn right and proceed 20 m (66 ft) SSW (200 T) to the water tank. The gauge is located inside of a 3 m x 3 m (10 ft x 10 ft) room at the SE corner of the room beneath the water tank. The orifice is located SW of the gauge on the SW pile of the Rine tank platform. The bench marks are located south of the hotel and along the spit. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: DESIGNATION: 946 3502 B TIDAL ALIAS: NO STAMPING 2 MONUMENTATION: Metal Rod VM#: 3136 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 55° 59.2' N ( 55.98731) LONGITUDE: 160° 34.6' W (-160.57667) The primary bench mark is set on a small rise in a private fenced off yard for a two story tin sided home, 17.98 m (59.0 ft) NE of the NE corner of the chain link fence which surrounds the fuel tank farm, 13.89 m (45.6 ft) north of the Southwestely most of two main doors on the NW face of a pole barn, 7.42 m (24.3 ft) SW of the SE corner of the two story home, and 4.11 m (13.5 ft) SE of the SE corner of a tin garage located SW of the two story home. The datum point is set 0.05 m (0.2 ft) above ground, being the top of a stainless steel rod driven 18.3 m (60 ft) to refusal, and encased in a 4-inch diameter x 0.2 m (0.7 ft) high PVC pipe with cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 946 3502 F TIDAL ALIAS: NO STAMPING 6 MONUMENTATION: Aluminum marker VM#: 3140 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Aluminum cap OPUS PID: LATITUDE: 55° 59.2' N ( 55.98742) LONGITUDE: 160° 34.6' W (-160.57650) The bench mark is the top of an aluminum cap set in the flower garden on the north side of the two story tin sided home, 5.27 m (17.3 ft) NNW of the NE corner of the home, 2.93 m (9.6 ft) east of the door centered on the north wall of the building, 1.7 m (5.6 ft) north of the building foundation, 1.1 m (3.6 ft) south of the south edge of the wooden sidewalk, and 0.08 m (0.3 ft) south of the south edge of the log wall around the flower garden. The bench mark is set flush with the flower garden, being the top of an aluminum cap threaded onto a 1 inch by 3.0 m (10.0 ft) steel Arctic Foundation Thermopile pressurized with 600 psi of carbon dioxide and driven 3.0 m (10.0 ft) into the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 946 3502 G TIDAL ALIAS: NO STAMPING 7 MONUMENTATION: Aluminum marker VM#: 3141 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Aluminum cap OPUS PID: LATITUDE: 55° 59.3' N ( 55.98756) LONGITUDE: 160° 34.6' W (-160.57742) The bench mark is the top of an aluminum cap set west of the cannery and is surrounded by two 2 inch x 4 inch red wooden witness posts, 6.95 m (22.8 ft) SSW of the west corner of the transformer building, 4.26 m (14.0 ft) ESE of 946 3502 UNSTAMPED, 2.43 m (8.0 ft) east of the SE leg of the satellite dish support, and 1.00 m (3.3 ft) east of the east corner of the concrete pad for the satellite dish. The bench mark is set 0.22 m (0.7 ft) above ground being the top of an aluminum cap threaded onto a 1 inch by 3.0 m (10.0 ft) steel Arctic Foundation Thermopile pressurized with 600 psi of carbon dioxide and driven 3.0 m (10.0 ft) into the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 946 3502 UNSTAMPED ALIAS: NO STAMPING 9 MONUMENTATION: Tidal Station disk VM#: 18235 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 55° 59.3' N ( 55.98758) LONGITUDE: 160° 34.6' W (-160.57750) The bench mark is a disk set flush in the concrete pad for the satellite dish on the west side of the cannery, 38.51 m (126.3 ft) SSE of 946 3502 C TIDAL, 7.93 m (26.0 ft) WSW of the west corner of the transformer building, 4.26 m (14.0 ft) WNW of 946 3502 G TIDAL, 1.03 m (3.4 ft) WSW of the NE leg of the satellite dish, 0.67 m (2.2 ft) ENE of the western leg of the satellite dish and 0.58 m (1.9 ft) SSW (197 T) of the north edge of the concrete pad. BENCH MARK STAMPING: 3502 J 2008 DESIGNATION: 946 3502 J MONUMENTATION: Tidal Station disk VM#: 18913 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete OPUS PID: LATITUDE: 55° 59.2' N ( 55.98619) LONGITUDE: 160° 34.5' W (-160.57428) The bench mark is a disk set flush in concrete midway along the pier, 15.54 m (51.0 ft) north of a fixed ladder to the water on the NE side of the pier, 4.55 m (14.9 ft) SW of the wooden bullrail, 0.71 m (2.3 ft) east of the northern most support of the northern most and largest of two horizontal cylinders stamped "RECEIVER", and 0.17 m (1.6 ft) SW of the edge of concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) T I D A L D A T U M S Tidal datums at PORT MOLLER, BRISTOL BAY based on: LENGTH OF SERIES: 9 Years TIME PERIOD: 07/07-06/10 & 09/10-08/16 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: HIGHEST OBSERVED WATER LEVEL (12/27/2007) = 4.338 MEAN HIGHER HIGH WATER MHHW = 3.195 MEAN HIGH WATER MHW = 2.931 MEAN TIDE LEVEL MTL = 1.797 MEAN SEA LEVEL MSL = 1.782 MEAN LOW WATER MLW = 0.663 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/13/2008) = -1.379 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 946 3502 B TIDAL 6.522 3.591 946 3502 F TIDAL 5.906 2.975 946 3502 G TIDAL 4.812 1.881 946 3502 UNSTAMPED 4.760 1.829 3502 J 2008 5.503 2.572
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9463502 PUBLICATION DATE: 11/30/2020 Name: PORT MOLLER, BRISTOL BAY AK NOAA Chart: 16363 Latitude: 55° 59.4' N ( 55.99000) USGS Quad: PORT MOLLER (D-2) Longitude: 160° 33.7' W (-160.56200) 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.