U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) To reach the station from the Vineyard Haven Ferry parking lot exit the parking lot to the left onto Water St and proceed 0.2 km (0.1 mi) to the intersection of Beach St. Water St., turn right onto Beach St and proceed 0.2 km (0.1 mi) to the intersection of Beach St. and Main/State Rd, turn slightly to the left as Beach St. becomes Main/State Rd. Proceed on State Rd. for 8.9 km (5.5mi). At the intersection of North Rd. and State Rd. turn right and proceed 10.0 km (6.2 mi). In the town of Menemsha at the intersection of North Rd. and Basin Rd. turn right and proceed 0.4 km (0.3 mi) to the parking lot at the end of the road. The station is located on the city of Chilmark?s finger pier that parallels the harbors jetty. 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: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: MEN 1 1994 DESIGNATION: MEN 1 MONUMENTATION: Tidal Station disk VM#: 18701 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID#: BBDM82 LATITUDE: 41° 21.3' N ( 41.35447) LONGITUDE: 70° 46.0' W ( -70.76706) The primary bench mark is set flush in the top of a retaining wall located within vicinity of Menemsha Marina parking lot area, 51.10 m (167.7 ft) NW from the NW corner of the gas station/general store, 9.80 m (32.2 ft) NE of the first power pole along the pier, 2.70 m (8.9 ft) NW of the seventh electrical outlet from the store along the retaining wall, and 0.2 m (0.7 ft) sea of the NE face of the retaining.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MEN 2 1994 DESIGNATION: MEN 2 MONUMENTATION: Tidal Station disk VM#: 18702 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 41° 21.3' N ( 41.35436) LONGITUDE: 70° 46.0' W ( -70.76650) The bench mark is set flush in the top of a retaining wall located in the vicinity of the Menemesha Marina parking lot, 13.90 m (45.6 ft) north of the northern most bollard along the retaining wall, 4.30 m (14.1 ft) SE of the first electrical outlet from the general store along the retaining wall, 3.70 m (12.1 ft) west of the NW corner of the gas station/general store and 3.30 m (10.8 ft) east of the water's edge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MEN 3 1994 DESIGNATION: MEN 3 MONUMENTATION: Tidal Station disk VM#: 18703 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 41° 21.2' N ( 41.35417) LONGITUDE: 70° 46.0' W ( -70.76625) The bench mark is set flush in the top of the retaining wall located in the vicinity of the Menemsha Marina parking lot, 22.40 m (73.5 ft) west of utility pole by the fish market, 18.90 m (62.0 ft) SE of the centerline Basin Road, 19.00 m (52.5 ft) SSW of a utility pole in front of the dockmaster's office, 3.40 m (11.2 ft) east of the water's edge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MEN 5 1994 DESIGNATION: MEN 5 MONUMENTATION: Tidal Station disk VM#: 18705 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bridge abutment OPUS PID: LATITUDE: 41° 21.2' N ( 41.35350) LONGITUDE: 70° 45.9' W ( -70.76528) The bench mark is set flush in the NE corner of the bridges abutment located in the vicinity of the Menemsha Marina parking lot, 38.70 m (127.0 ft) north of a power pole on the corner of Basin Road and the dead end street, 16.50 m (54.1 ft) east of the east corner of the first building on the west side of the marina, 4.60 m (15.09 ft) NE of the centerline of Basin Road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) T I D A L D A T U M S Tidal datums at MENEMSHA HARBOR based on: LENGTH OF SERIES: 3 YEARS TIME PERIOD: Sept 2008 thru Aug 2010 & May 2011 thru April 2012 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8452660 NEWPORT, NARRAGANSETT BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (12/12/2008) = 1.651 MEAN HIGHER HIGH WATER MHHW = 0.956 MEAN HIGH WATER MHW = 0.878 MEAN TIDE LEVEL MTL = 0.458 MEAN SEA LEVEL MSL = 0.417 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/30/2010) = -0.500 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW MEN 1 1994 2.306 1.428 MEN 2 1994 2.307 1.429 MEN 3 1994 2.304 1.426 MEN 5 1994 2.361 1.483
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8448725 PUBLICATION DATE: 02/08/2013 Name: MENEMSHA HARBOR MA NOAA Chart: 13233 Latitude: 41° 21.3' N ( 41.35444) USGS Quad: SQUIBNOCKET Longitude: 70° 46.1' W ( -70.76783) 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.