U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) To reach the station from the US Highway 1 (Main Street) bridge over the Mystic River in Mystic, proceed west on US Highway 1 for 0.2 km (0.1 mi) to Water Street (State Highway 215), turn left and proceed south for 1.1 km (0.7 mi) on State Highway 215 to School Street on the left, turn left and proceed southeast for 0.3 km (0.2 mi) to its termination at Essex Street. Turn right and proceed southwest for 0.1 km (0.1 mi) to the Mystic Shipyard on the left at 100 Essex Street. The bench marks are located between the north end of Casino Road and the intersection of State Highway 215 and Cedar Road. The tide gauge is located on the west end of the north pier at Mystic Shipyard. 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 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1917 DESIGNATION: TIDAL 1 STA 2 MONUMENTATION: DJ VM#: 21427 AGENCY: US Coast & Geodetic Survey IDB PID#: LW0715 SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 41° 20.8' N ( 41.34611) LONGITUDE: 71° 58.5' W ( -71.97469) The primary bench mark is a disk set in a bedrock outcrop on the E end of the property at the shoreline, 23.93 m (78.5 ft) E of a 6.1 m (20 ft) tall post, 19.95 m (65.5 ft) ENE of the center of a flue for an outdoor stone fireplace, 12.35 m (40.5 ft) SSE of the NE corner of an abandoned house, 10.92 m (35.8 ft) E of a 25 cm (10 in) diameter oak tree and 8.07 m (26.5 ft) SE of the SE corner of an abandoned house. BENCH MARK STAMPING: 0751 A 2015 DESIGNATION: 846 0751 A MONUMENTATION: DB VM#: 21428 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Footings/foundation walls of small/medium structures OPUS PID: LATITUDE: 41° 20.6' N ( 41.34372) LONGITUDE: 71° 58.4' W ( -71.97400) The bench mark is a disk set in an E facing garage door in the concrete footing of a shop building on the NE side of the shipyard, 21.21 m (69.6 ft) W of a piling N of a gated access pier labeled with the letter C, 17.90 m (58.7 ft) NW of the N piling at the corner of a steel seawall of the dock, 16.85 m (55.3 ft) W of a telephone pedestal near the intersection of the armor rock seawall and steel seawall, 8.96 m (29.4 ft) NNE of the center of the N most man door to the building and 2.47 m (8.1 ft) SSW of the NE corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HILL 1934 DESIGNATION: HILL MONUMENTATION: DS VM#: 21429 AGENCY: US Coast & Geodetic Survey IDB PID#: LW0714 SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 41° 20.4' N ( 41.34053) LONGITUDE: 71° 58.7' W ( -71.97900) The bench mark is a disk set in bedrock at a location named the point N of sixpenny island as named by USGS, 41.8 m (137.1 ft) ESE of the E rail of the railroad tracks, and 7.10 m (23.3 ft) NW of of a 1.0 ft (0.3 m) long bent metal rod embedded in bedrock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HILL NO 1 1934 DESIGNATION: HILL RM 1 MONUMENTATION: DR VM#: 21430 AGENCY: US Coast & Geodetic Survey IDB PID#: LW0712 SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 41° 20.4' N ( 41.34053) LONGITUDE: 71° 58.7' W ( -71.97869) The bench mark is a disk set in bedrock at a location named the point N of sixpenny island as named by USGS, 26.55 m (87.1 ft) E of station hill set at the highest point on the bedrock at the point, 24.95 m (81.9 ft) ESE of the SE corner of an old stone foundation, and 3.84 m (12.6 ft) W of a cliff leading down to the water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HILL NO 2 1934 DESIGNATION: HILL RM 2 MONUMENTATION: DR VM#: 21431 AGENCY: US Coast & Geodetic Survey IDB PID#: LW0713 SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 41° 20.4' N ( 41.34042) LONGITUDE: 71° 58.7' W ( -71.97881) The bench mark is a disk set in bedrock at a location named the point N of sixpenny island as named by USGS, 16.00 m (52.5 ft) ESE of station hill on the highest bedrock at the point, 12.65 m (41.5 ft) N of a concrete wall at the shoreline where bedrock meets the mudflats and 9.75 m (32.0 ft) ESE of a 0.3 m (1.0 ft) bent metal rod embedded in the bedrock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: V 37 1965 DESIGNATION: V 37 MONUMENTATION: DB VM#: 21432 AGENCY: Coast and Geodetic Survey IDB PID#: LW0711 SETTING CLASSIFICATION: In rock outcrop OPUS PID#: LW0711 LATITUDE: 41° 20.5' N ( 41.34203) LONGITUDE: 71° 59.0' W ( -71.98272) The bench mark is a disk set in bedrock, 25.30 m (83.0 ft) NNW of center of a catch basin W of residence driveway on Noank road, 24.35 m (79.9 ft) S of a utility pole in the residence front yard, 23.76 m (78.0 ft) NNW of a fire hydrant, 9.45 m (31.0 ft) W of the centerline of the residence driveway perpendicular to the rock formation and 3.99 m (13.1 ft) ENE of a utility pole just W of the bedrock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) T I D A L D A T U M S Tidal datums at WEST MYSTIC, MYSTIC RIVER based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: May 2015 - August 2015 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8461490 NEW LONDON, THAMES RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.909 MEAN HIGH WATER MHW = 0.820 North American Vertical Datum NAVD88 = 0.565 MEAN SEA LEVEL MSL = 0.450 MEAN TIDE LEVEL MTL = 0.439 MEAN LOW WATER MLW = 0.058 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1917 1.279 0.459 0751 A 2015 1.952 1.132 HILL 1934 7.919 7.099 HILL NO 1 1934 5.532 4.712 HILL NO 2 1934 5.098 4.278 V 37 1965 9.354 8.534
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8460751 PUBLICATION DATE: 06/20/2016 Name: WEST MYSTIC, MYSTIC RIVER CT NOAA Chart: 13214 Latitude: 41° 20.6' N ( 41.34330) USGS Quad: Mystic Longitude: 71° 58.5' W ( -71.97500) 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.