U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8447295 PUBLICATION DATE: 05/23/2003 Name: GRAY GABLES, BUZZARDS BAY MA NOAA Chart: 13230 Latitude: 41° 44.1' N ( 41.73500) USGS Quad: POCASSET Longitude: 70° 37.4' W ( -70.62330) To reach the tidal bench marks from the first traffic rotary after crossing south over the Bourne Bridge (Route 28 south), proceed NW at the first exit - Trowbridge Road, following the signs for Mashnee Village for 1.0 km (0.6 mi) to Shore Road, then continue straight on Shore Road for 1.4 km (0.9 mi) to Monument Neck Road, stay right and proceed straight (WSW) on Monument Neck Road for 0.2 km (0.1 mi) to Presidents Road, turn right and continue on Presidents Road for 0.3 km (0.2 mi), turn left and continue on Presidents Road for 0.3 km (0.2 mi), then turn right and go 0.3 km (0.2 mi) to No. 211 Presidents Road. The bench marks are located along Presidents, Bryant, and Beverly Roads. The tide gauge was located on the NW end of the private pier behind No. 211 Presidents Road. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7295 C 2000 DESIGNATION: 844 7295 C MONUMENTATION: Tidal Station disk VM#: 16262 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 41° 44.1' N ( 41.73500) LONGITUDE: 70° 37.4' W ( -70.62330) The primary bench mark is a disk set in the NW corner of the junction of two seawalls along the beach at No. 7 Bryant Road, in a patch of wild roses, 23.65 m (77.6 ft) NNW of the NW corner of the house, 17.50 m (57.4 ft) NNE of the center of a walkway leading from the back of the house to the beach, 3 m (10 ft) SSW of a low stonewall, and 0.20 m (0.7 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8447295 PUBLICATION DATE: 05/23/2003 Name: GRAY GABLES, BUZZARDS BAY MA NOAA Chart: 13230 Latitude: 41° 44.1' N ( 41.73500) USGS Quad: POCASSET Longitude: 70° 37.4' W ( -70.62330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7295 A 2000 DESIGNATION: 844 7295 A MONUMENTATION: Tidal Station disk VM#: 16263 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 41° 44.1' N ( 41.73500) LONGITUDE: 70° 37.4' W ( -70.62330) The bench mark is a disk set in the west corner of the concrete base of an ornamental lighthouse at No. 216 Presidents Road, the last house on Presidents Road, 28.42 m (93.2 ft) north of the western of two stone entrance pillars at the end of the road, 27.80 m (91.2 ft) WNW of the NE corner of the house, 15.75 m (51.7 ft) NE of the NE edge of an old paved road on the point, and 0.10 m (0.3 ft) above ground level. BENCH MARK STAMPING: 7295 B 2000 DESIGNATION: 844 7295 B MONUMENTATION: Tidal Station disk VM#: 16264 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 41° 44.1' N ( 41.73500) LONGITUDE: 70° 37.4' W ( -70.62330) The bench mark is a disk set in the NW end of a concrete retaining wall on the NW side of the driveway at No. 8 Bryant Road, 21.75 m (71.4 ft) SSW of power pole No. 1, 19.15 m (62.8 ft) NE of power pole No. 2, 6.40 m (21.0 ft) ESE of the center of Bryant Road, and 0.40 m (1.3 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8447295 PUBLICATION DATE: 05/23/2003 Name: GRAY GABLES, BUZZARDS BAY MA NOAA Chart: 13230 Latitude: 41° 44.1' N ( 41.73500) USGS Quad: POCASSET Longitude: 70° 37.4' W ( -70.62330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7295 D 2000 DESIGNATION: 844 7295 D MONUMENTATION: Tidal Station disk VM#: 16265 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 41° 44.1' N ( 41.73500) LONGITUDE: 70° 37.4' W ( -70.62330) The bench mark is a disk set in the NW end of the SW retaining wall of the driveway at No. 36 Benedict Road, 11.93 m (39.1 ft) west of the NW corner of the house, 9.80 m (32.2 ft) north of the SE corner of No. 40 Benedict Road, 9.25 m (30.3 ft) SSE of the center of Benedict Road, and 0.35 m (1.1 ft) above the driveway. BENCH MARK STAMPING: 7295 E 2000 DESIGNATION: 844 7295 E MONUMENTATION: Tidal Station disk VM#: 16266 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pier OPUS PID: LATITUDE: 41° 44.1' N ( 41.73500) LONGITUDE: 70° 37.4' W ( -70.62330) The bench mark is a disk set in the concrete dock at No. 39 Benedict Road, near the foot of the steps leading down from the house to the pier, 8.55 m (28.1 ft) WNW of the NE corner of the house, 7.30 m (24.0 ft) north of the NW corner of the house, and 0.70 m (2.3 ft) NNW of the seawall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8447295 PUBLICATION DATE: 05/23/2003 Name: GRAY GABLES, BUZZARDS BAY MA NOAA Chart: 13230 Latitude: 41° 44.1' N ( 41.73500) USGS Quad: POCASSET Longitude: 70° 37.4' W ( -70.62330) T I D A L D A T U M S Tidal datums at GRAY GABLES, BUZZARDS BAY based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: August 2000 - September 2000 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8452660 NEWPORT, NARRAGANSETT BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.250 MEAN HIGH WATER MHW = 1.155 MEAN TIDE LEVEL MTL = 0.604 MEAN SEA LEVEL MSL = 0.537 MEAN LOW WATER MLW = 0.052 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7295 C 2000 2.118 0.963 7295 A 2000 2.374 1.219 7295 B 2000 3.078 1.923 7295 D 2000 4.674 3.519 7295 E 2000 1.873 0.718
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8447295 PUBLICATION DATE: 05/23/2003 Name: GRAY GABLES, BUZZARDS BAY MA NOAA Chart: 13230 Latitude: 41° 44.1' N ( 41.73500) USGS Quad: POCASSET Longitude: 70° 37.4' W ( -70.62330) 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.