U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) To reach the bench marks from the intersection of Bridge Street (Route 134) and Route 6, proceed north on Bridge Street for 5.3 km (3.3 mi) to the intersection of Route 6A and Bridge Street, then continue north on Bridge Street for 0.6 km (0.4 mi) to Sesuit Neck Road, proceed NW on Sesuit Neck Road for 1.0 km (0.6 mi) to the Town of Dennis Municipal Dock. The bench marks are in the vicinity of the town dock and the adjacent Northside Marina, and the tide gauge and staff were on the east end of the town dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7241 A 1993 DESIGNATION: 844 7241 A MONUMENTATION: Tidal Station disk VM#: 12466 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete footing OPUS PID: LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The primary bench mark is a disk set in the concrete footing of the SW corner of the southermost building at the Northside Marina, 37 m (121 ft) west of the SE corner of the building, 23 m (75 ft) north of the center of the boat ramp, 0.43 m (1.4 ft) ESE of the SW corner of the building, and 0.18 m (0.6 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7241 B 1993 DESIGNATION: 844 7241 B MONUMENTATION: Tidal Station disk VM#: 12467 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: BBBJ59 LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The bench mark is a disk set in the concrete sea wall at the NE end of Northside Marina, 39.78 m (130.5 ft) north of the north edge of the boat deployment dock, 27.58 m (90.5 ft) ENE of the NE corner of the northernmost building of the marina, 0.09 m (0.3 ft) ESE of the north edge of the seawall, and 0.06 m (0.2 ft) above ground. BENCH MARK STAMPING: 7241 C 1993 DESIGNATION: 844 7241 C MONUMENTATION: Tidal Station disk VM#: 12468 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete wall OPUS PID: LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The bench mark is a disk set in the top of the south wall of the Dennis Yacht Club tennis courts, 28.56 m (93.7 ft) east of the west corner of the south wall, 2.68 m (8.8 ft) west of the east corner of the south wall, 0.06 m (0.2 ft) NW of the south edge of the wall, and 1 m (3 ft) above the tennis court.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7241 D 1993 DESIGNATION: 844 7241 D MONUMENTATION: Tidal Station disk VM#: 12469 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock outcrop OPUS PID: LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The bench mark is a disk set in the top of a bedrock outcrop on the west side of Sesuit Neck Road, 17 m (56 ft) WSW of utility pole #24, 9 m (29 ft) west of the road centerline, 0.85 m (2.8 ft) east of the west point of the outcrop, and 2 m (6 ft) above ground. BENCH MARK STAMPING: D 1974 DESIGNATION: 844 7241 USE D MONUMENTATION: Survey disk VM#: 12470 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete fence post OPUS PID: LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The bench mark is a disk set in top of a fence post located on the SE side of Sesuit Neck Road, 16.89 m (55.4 ft) WSW of utility pole 72/20A along the NW edge of the Municipal Pier parking lot, 11.28 m (37.0 ft) SE of the road centerline, 3.51 m (11.5 ft) ESE of the SE corner of the Shiverick Shipyard monument, and 0.88 m (2.9 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 139G DESIGNATION: 844 7241 139G MONUMENTATION: Traverse Station disk VM#: 12471 AGENCY: Massachusetts Department of Public Works (MDPW) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 41° 44.5' N ( 41.74170) LONGITUDE: 70° 9.7' W ( -70.16170) The bench mark is a disk set in a 0.27 m (0.9 ft) diameter concrete monument located on the west side of State Route 134 south of the intersection of Route 134 and State Route 6A in the town of East Dennis, 19.32 m (63.4 ft) SW of a nail in power pole No. 36/449, 11.73 m (38.5 ft) north of a nail in light pole No. 37C/234, 11 m (36 ft) south of Route 6A, 9.08 m (29.8 ft) NE of the corner of Clear View Cottage, 6 m (20 ft) west of Route 134, and 0.03 m (0.1 ft) below ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 844 7241 TIDAL 1 ALIAS: NO STAMPING 1 MONUMENTATION: Survey disk VM#: 12480 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 41° 45.1' N ( 41.75170) LONGITUDE: 70° 9.3' W ( -70.15500) The bench mark is a disk set in a flagpole base at the NE end of Northside Marina, 15.64 m (51.3 ft) SE of the southern fuel pump, 5.58 m (18.3 ft) north of the east end of the concrete seawall, and 0.30 m (1.0 ft) west of the flagpole.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) T I D A L D A T U M S Tidal datums at SESUIT HARBOR, EAST DENNIS based on: LENGTH OF SERIES: 3 Months TIME PERIOD: May 1993 - July 1993 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8443970 BOSTON, BOSTON HARBOR Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.190 MEAN HIGH WATER MHW = 3.051 MEAN SEA LEVEL MSL = 1.593 MEAN TIDE LEVEL MTL = 1.568 MEAN LOW WATER MLW = 0.084 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7241 A 1993 4.928 1.877 7241 B 1993 4.752 1.701 7241 C 1993 6.497 3.446 7241 D 1993 6.406 3.355 D 1974 9.088 6.037 139G 10.782 7.731 844 7241 TIDAL 1 4.112 1.061
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8447241 PUBLICATION DATE: 04/21/2003 Name: SESUIT HARBOR, EAST DENNIS MA NOAA Chart: 13246 Latitude: 41° 45.1' N ( 41.75170) USGS Quad: DENNIS Longitude: 70° 9.3' W ( -70.15500) 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.