U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8419528 PUBLICATION DATE: 05/20/2004 Name: FORT POINT, YORK HARBOR ME NOAA Chart: 13283 Latitude: 43° 7.8' N ( 43.13000) USGS Quad: YORK HARBOR Longitude: 70° 38.3' W ( -70.63830) To reach the tidal bench marks from the intersection of U.S. Highway 1A and Harbor Beach Road in Fort Point, proceed 0.3 km (0.2 mi) SSW on Harbor Beach Road to Stage Neck Inn Restaurant. The bench marks are located on the property of Stage Neck Inn Restaurant. The tide gage and staff was bolted to a large boulder at the approximate waters edge at low tide. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9528 A 1976 DESIGNATION: 841 9528 A TIDAL MONUMENTATION: Tidal Station disk VM#: 1959 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcropping OPUS PID: LATITUDE: 43° 7.8' N ( 43.13000) LONGITUDE: 70° 38.3' W ( -70.63830) The primary bench mark is a disk set in a rock outcropping in the east yard of Stage Neck Inn Restaurant, 2 m (5 ft) east of the SE corner of a concrete patio at the east side of the restaurant. BENCH MARK STAMPING: 9528 B 1976 DESIGNATION: 841 9528 B TIDAL MONUMENTATION: Tidal Station disk VM#: 1960 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcropping OPUS PID: LATITUDE: 43° 7.8' N ( 43.13000) LONGITUDE: 70° 38.3' W ( -70.63830) The bench mark is a disk set in a rock outcropping at the base of a thickly vegetated area in the NE yard of Stage Neck Inn Restaurant, 28 m (91 ft) south of the north cliff edge, and 21 m (70 ft) west of the east cliff edge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8419528 PUBLICATION DATE: 05/20/2004 Name: FORT POINT, YORK HARBOR ME NOAA Chart: 13283 Latitude: 43° 7.8' N ( 43.13000) USGS Quad: YORK HARBOR Longitude: 70° 38.3' W ( -70.63830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9528 C 1976 DESIGNATION: 841 9528 C TIDAL MONUMENTATION: Tidal Station disk VM#: 1961 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcropping OPUS PID: LATITUDE: 43° 7.8' N ( 43.13000) LONGITUDE: 70° 38.3' W ( -70.63830) The bench mark is a disk set in a rock outcropping in the NE yard of Stage Neck Inn Restaurant, 20 m (64 ft) south of the north cliff edge, 16 m (54 ft) west of the east cliff edge, and 2 m (7 ft) NNE of the thickly vegetated area around bench mark 9528 B 1976. BENCH MARK STAMPING: 9528 D 1976 DESIGNATION: 841 9528 D TIDAL MONUMENTATION: Tidal Station disk VM#: 1962 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcropping OPUS PID: LATITUDE: 43° 7.8' N ( 43.13000) LONGITUDE: 70° 38.3' W ( -70.63830) The bench mark is a disk set in a rock outcropping in the NE yard of Stage Neck Inn Restaurant, NE of the NE corner of the restaurant, 26 m (85 ft) ESE of bench mark 9528 E 1976.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8419528 PUBLICATION DATE: 05/20/2004 Name: FORT POINT, YORK HARBOR ME NOAA Chart: 13283 Latitude: 43° 7.8' N ( 43.13000) USGS Quad: YORK HARBOR Longitude: 70° 38.3' W ( -70.63830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9528 E 1976 DESIGNATION: 841 9528 E TIDAL MONUMENTATION: Tidal Station disk VM#: 1963 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcropping OPUS PID: LATITUDE: 43° 7.8' N ( 43.13000) LONGITUDE: 70° 38.3' W ( -70.63830) The bench mark is a disk set in a rock outcropping between two footpaths in the north yard of Stage Neck Inn Restaurant, 11 m (36 ft) north of the north wall of the restaurant, and 9 m (29 ft) south of the north cliff edge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8419528 PUBLICATION DATE: 05/20/2004 Name: FORT POINT, YORK HARBOR ME NOAA Chart: 13283 Latitude: 43° 7.8' N ( 43.13000) USGS Quad: YORK HARBOR Longitude: 70° 38.3' W ( -70.63830) T I D A L D A T U M S Tidal datums at FORT POINT, YORK HARBOR based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: September 1976 - September 1976 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8419870 SEAVEY ISLAND, PORTSMOUTH HARBOR Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.872 MEAN HIGH WATER MHW = 2.745 MEAN SEA LEVEL MSL = 1.439 MEAN TIDE LEVEL MTL = 1.421 MEAN LOW WATER MLW = 0.097 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9528 A 1976 9.405 6.660 9528 B 1976 10.497 7.752 9528 C 1976 10.349 7.604 9528 D 1976 10.222 7.477 9528 E 1976 9.035 6.290
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8419528 PUBLICATION DATE: 05/20/2004 Name: FORT POINT, YORK HARBOR ME NOAA Chart: 13283 Latitude: 43° 7.8' N ( 43.13000) USGS Quad: YORK HARBOR Longitude: 70° 38.3' W ( -70.63830) 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.