U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W To reach the tidal bench marks from eastbound Interstate 95, take the east Main Street exit, proceed south on east Main Street for 0.1 mile (0.2 km), proceed left onto Stratford Avenue for 0.1 mile (0.2 km), and right on Pembroke Street to Pauls Diesel Repair. The bench marks are located within a 1 mile (1.6 km) radius of the tide station. The tide house is at the end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: MONUMENTATION: VM#: 258 AGENCY: PID#: AI1725 SETTING CLASSIFICATION: BENCH MARK STAMPING: TIDAL 12 ELEV. 15.321 FT MONUMENTATION: Survey Disk VM#: 248 AGENCY: PID#: LX0856 SETTING CLASSIFICATION: Concrete Foundation The bench mark is located in the front foundation wall at 445 Stratford Avenue, 128 feet (39.0 m) east of the centerline of Pembroke Street, 34.2 feet (10.4 m) NW of the centerline of Stratford Avenue, and 1 foot (0.3 m) east of the SW corner of the building. The bench mark is set vertically 0.5 foot (0.2 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: T2 1922 ELEV. 16.772 FT MONUMENTATION: Survey Disk VM#: 249 AGENCY: PID#: LX0855 SETTING CLASSIFICATION: Granite Foundation The bench mark is located at the SE corner of the intersection of State Street and Main Street in the NW corner of the Connecticut National Bank granite foundation, 41.8 feet (12.7 m) ESE of the centerline of Main Street, 27 feet (8.2 m) south of the centerline of State Street, and 6.2 feet (1.9 m) east of the NW corner of the bank building. The bench mark is set 1.6 feet (0.5 m) above the sidewalk. BENCH MARK STAMPING: 14 1942 MONUMENTATION: Survey Disk VM#: 250 AGENCY: PID#: LX0852 SETTING CLASSIFICATION: Granite Step The bench mark is set in the granite step at the United Illuminating Company main entrance at 1115 Broad Street, 61 feet (19 m) north of the centerline of Cannon Street, 39.0 feet (11.9 m) north of the SE corner of the United Illuminating Company building, and 30.2 feet (9.2 m) WSW of the centerline of Broad Street. The bench mark is 0.5 foot (0.2 m) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: A31 1963 MONUMENTATION: Survey Disk VM#: 251 AGENCY: PID#: LX0861 SETTING CLASSIFICATION: Concrete Wall The bench mark is located at the Stratford Avenue underpass beneath the Connecticut Turnpike, 87.0 feet (26.6 m) SE of light pole #9058, 37.9 feet (11.6 m) east of the centerline of Stratford Avenue, and 1.0 feet (0.3 m) east of the west corner of the south abutment of the underpass wall. The bench mark is 2.5 feet (0.8 m) above ground level, and is set vertically in the SE corner of the east headwall. BENCH MARK STAMPING: NO 15 1964 MONUMENTATION: Survey Disk VM#: 252 AGENCY: PID#: LX0857 SETTING CLASSIFICATION: Concrete Foundation The bench mark is set flush in the concrete floor located inside the Hitchcocks Gas Engine Companys machine shop, 46.2 feet (14.1 m) SE of the most NE corner of Hitchcocks Gas Engine Company, 11 feet (3 m) SE of a stairway leading to the office, 8.8 feet (2.7 m) SW of the NE corner of the machine shop, and 4.5 feet (1.4 m) west of the interior face of the east wall of the building. BENCH MARK STAMPING: NO 16 1973 MONUMENTATION: Survey Disk VM#: 253 AGENCY: PID#: LX2345 SETTING CLASSIFICATION: Concrete Headwall The bench mark is set in the marine railway concrete headwall, located on the west side of the Hitchcock Marina building, 22.4 feet (6.8 m) east of the east door leading to the engine shop, 16.0 feet (4.9 m) east of the east rail of the railway, and 0.9 foot (0.3 m) north of the south end of the railway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 17 1973 MONUMENTATION: Survey Disk VM#: 254 AGENCY: PID#: LX2344 SETTING CLASSIFICATION: Concrete Footing The bench mark is set in a concrete footing for a wire fence located on the east edge of the Hitchcock Gas Engine Company property, 45.7 feet (13.9 m) SE of the east corner of the two-story brick machine shop, 39.1 feet (11.9 m) south of a metal gate post in the yard, 23.6 feet (7.2 m) NE of the NE corner of the engine shop, 18 feet (5 m) south of the south end of an asphalt drive leading to the marina, and 5 feet (2 m) north of a fire hydrant. The bench mark is 0.7 foot (0.2 m) above ground level. BENCH MARK STAMPING: CITY OF BRIDGEPORT MONUMENTATION: Survey Disk VM#: 255 AGENCY: PID#: LX0859 SETTING CLASSIFICATION: Concrete Sidewalk The bench mark is set in concrete sidewalk located on the NE corner of the intersection of Stratford Avenue and Hough Avenue, 26.3 feet (8.0 m) north of the traffic island on Stratford Avenue, 22.9 feet (7.0 m) east of the centerline of Hough Avenue, and 7.0 feet (2.1 m) east of the east line of the curb of Hough and Stratford Avenues, and 2.4 feet (0.7 m) north of the north curb of Hough and Stratford Avenues.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: CHD D1310 BASELINE MONUMENTATION: Survey Disk VM#: 256 AGENCY: PID#: LX2343 SETTING CLASSIFICATION: Concrete Sidewalk The bench mark is set in a concrete sidewalk located directly under the east- bound lane of Interstate 95 along Stratford Avenue just east of the Pequonnock River bridge, 26.6 feet (8.1 m) west of light pole #528, 8.3 feet (2.6 m) north of a chain link fence, and 2.0 feet (0.6 m) south of the curb. BENCH MARK STAMPING: V2 20.49 MONUMENTATION: Survey Disk VM#: 257 AGENCY: PID#: LX0864 SETTING CLASSIFICATION: Stone Step The bench mark is set in the south end of the bottom step, located on Hollister Street at the southernmost entrance to McKinley School, 54.0 feet (16.5 m) east of the centerline of Hollister Street, 35.2 feet (10.7 m) north of the SW corner of the brickwork at the basement level, 12 feet (4 m) north of the south end of the building, and 7.6 feet (2.3 m) south of the north edge of the southerly entrance way on the west face of the building. The bench mark is 0.3 foot (0.1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W T I D A L D A T U M S Tidal datums at BRIDGEPORT, BRIDGEPORT HARBOR based on: LENGTH OF SERIES: 18 YEARS TIME PERIOD: 1967-1984 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8518750 THE BATTERY, NY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (09/21/1938) = 12.44 MEAN HIGHER HIGH WATER MHHW = 7.33 MEAN HIGH WATER MHW = 6.99 MEAN TIDE LEVEL MTL = 3.62 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 2.92 MEAN LOW WATER MLW = 0.25 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (02/02/1976) = -4.41 * NGVD reference based on adjustment of 1967 and NOS levels of 1967-1984. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 0 0.00 0.00 TIDAL 12 ELEV. 15.321 FT 18.24 11.25 T2 1922 ELEV. 16.772 FT 19.69 12.70 14 1942 21.31 14.32 A31 1963 23.37 16.38 NO 15 1964 13.36 6.37 NO 16 1973 9.37 2.38 NO 17 1973 13.07 6.08 CITY OF BRIDGEPORT 16.08 9.09 CHD D1310 BASELINE 11.54 4.55 V2 20.49 23.34 16.35
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 PUBLICATION DATE: 11/06/1986 Station ID: 8467150 SUPERCEDED DATE: 04/21/2003 Name: BRIDGEPORT, BRIDGEPORT HARBOR CONNECTICUT NOAA Chart: 12369 Latitude: 41° 10.4' N USGS Quad: BRIDGEPORT Longitude: 73° 10.9' W 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 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.