U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8447173 PUBLICATION DATE: 04/21/2003 Name: STATION 115, CAPE COD CANAL MA NOAA Chart: 13236 Latitude: 41° 46.4' N ( 41.77330) USGS Quad: SAGAMORE Longitude: 70° 32.1' W ( -70.53500) To reach the tidal bench marks from the traffic circle on U.S. Highway 6 in Sagamore, at the south end of the highway bridge over the Cape Cod Canal, proceed east on U.S. Highway 6 for 0.8 km (0.5 mi), then turn left on Pleasant Street and continue north to the Development Sciences, Inc. office building. The bench marks are located between the Bay Colony Railway tracks and the canal service road. The tide gage was located on a 2-pile structure just offshore of Corps of Engineers station 115+00. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7173 D 1982 DESIGNATION: 844 7173 D MONUMENTATION: Tidal Station disk VM#: 1514 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 41° 46.4' N ( 41.77330) LONGITUDE: 70° 32.1' W ( -70.53500) The primary bench mark is a disk located NW of the Development Sciences, Inc. building at 39 Pleasant Street, 5.64 m (18.5 ft) north of the northernmost rail on the southernmost of two railroad tracks, 3.14 m (10.3 ft) south of the Cape Cod Canal service road, and 0.64 m (2.1 ft) SW of a power pole with a white cross painted on it. The bench mark is 6 cm (0.2 ft) below ground, crimped to a stainless steel rod driven 7.3 m (24 ft) and encased in a PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8447173 PUBLICATION DATE: 04/21/2003 Name: STATION 115, CAPE COD CANAL MA NOAA Chart: 13236 Latitude: 41° 46.4' N ( 41.77330) USGS Quad: SAGAMORE Longitude: 70° 32.1' W ( -70.53500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7173 E 1982 DESIGNATION: 844 7173 E MONUMENTATION: Tidal Station disk VM#: 1515 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 41° 46.4' N ( 41.77330) LONGITUDE: 70° 32.1' W ( -70.53500) The bench mark is a disk located SE of Bench Mark 7173 D 1982, 7.32 m (24.0 ft) north of the northernmost rail of the southernmost of two railroad tracks, 5.55 m (18.2 ft) south of the Cape Cod Canal service road, and 3.90 m (12.8 ft) SW of a power pole with a white cross painted on it. The bench mark is crimped to a stainless steel rod driven 4.9 m (16 ft), and encased in a PVC pipe with concrete kickblock. NOTE: The PVC pipe has been damaged. BENCH MARK STAMPING: CC 483 1974 DESIGNATION: 844 7173 CC 483 MONUMENTATION: Survey disk VM#: 1517 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 41° 46.4' N ( 41.77330) LONGITUDE: 70° 32.1' W ( -70.53500) The bench mark is a disk set in a concrete monument at the west end of a granite headwall, 78.3 m (257 ft) west of station 115+00, 3.23 m (10.6 ft) south of the centerline of the service road, and 2.13 m (7.0 ft) north of the northernmost rail of two railroad tracks, and 0.15 m (0.5 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8447173 PUBLICATION DATE: 04/21/2003 Name: STATION 115, CAPE COD CANAL MA NOAA Chart: 13236 Latitude: 41° 46.4' N ( 41.77330) USGS Quad: SAGAMORE Longitude: 70° 32.1' W ( -70.53500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 844 7173 BOLT MONUMENTATION: Bolt VM#: 16510 AGENCY: Unknown IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 41° 46.4' N ( 41.77330) LONGITUDE: 70° 32.1' W ( -70.53500) The bench mark is a bolt set in a concrete retaining wall at the west side of the entrance to the parking lot for Development Sciences, Inc. at 39 Pleasant Street, 7.0 m (23 ft) north of the centerline of Pleasant Street, 1.02 m (3.3 ft) NE of power pole No. 265/1, 0.26 m (0.9 ft) west of the east end of the wall, and at ground level on the south side of the wall. BENCH MARK STAMPING: 7173 F 2001 DESIGNATION: 844 7173 F MONUMENTATION: Tidal Station disk VM#: 16511 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pole base OPUS PID: LATITUDE: 41° 46.4' N ( 41.77330) LONGITUDE: 70° 32.1' W ( -70.53500) The bench mark is a disk set in the SE corner of the concrete light pole base at Station 115, 39.22 m (128.7 ft) SE of the first power pole east of Station 115, 5.70 m (18.7 ft) NNE of the Station 115 pole, 0.15 m (0.5 ft) NE of the SE corner of the base, and 0.10 m (0.3 ft) below the service road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8447173 PUBLICATION DATE: 04/21/2003 Name: STATION 115, CAPE COD CANAL MA NOAA Chart: 13236 Latitude: 41° 46.4' N ( 41.77330) USGS Quad: SAGAMORE Longitude: 70° 32.1' W ( -70.53500) T I D A L D A T U M S Tidal datums at STATION 115, CAPE COD CANAL based on: LENGTH OF SERIES: 3 Months TIME PERIOD: July 2001 - September 2001 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 = 2.618 MEAN HIGH WATER MHW = 2.499 MEAN SEA LEVEL MSL = 1.345 MEAN TIDE LEVEL MTL = 1.295 MEAN LOW WATER MLW = 0.092 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7173 D 1982 6.277 3.778 7173 E 1982 5.924 3.425 CC 483 1974 6.938 4.439 844 7173 BOLT 7.412 4.913 7173 F 2001 6.280 3.781
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8447173 PUBLICATION DATE: 04/21/2003 Name: STATION 115, CAPE COD CANAL MA NOAA Chart: 13236 Latitude: 41° 46.4' N ( 41.77330) USGS Quad: SAGAMORE Longitude: 70° 32.1' W ( -70.53500) 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.