U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8721138 PUBLICATION DATE: 07/02/2003 Name: HALIFAX RIVER, PONCE INLET FL NOAA Chart: 11484 Latitude: 29° 4.9' N ( 29.08170) USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W ( -80.93670) To reach the tidal bench marks from Ponce de Leon Inlet, proceed north to Beach Street, then proceed west on Beach Street to the Down the Hatch Restuarant on the Halifax River. The bench marks are along Beach Street, Peninsula Drive and in the vicinity of the Down the Hatch Restuarant. The tide gage and staff were located on the NW end of the pier at the restuarant. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5 1974 DESIGNATION: 872 1138 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 5295 AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1525 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 4.9' N ( 29.08170) LONGITUDE: 80° 56.1' W ( -80.93500) The primary bench mark is a disk set flush in the top of a 0.24 m (0.8 ft) square concrete monument at the SW corner of the intersection of Beach Street and Sailfish Drive, 12.2 m (40 ft) west of the fire hydrant across Sailfish Drive, 5 m (18 ft) SSE of the centerline of Beach Street, 1 m (4 ft) SE of a power line pole, and 0.15 m (0.5 ft) below the pavement.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8721138 PUBLICATION DATE: 07/02/2003 Name: HALIFAX RIVER, PONCE INLET FL NOAA Chart: 11484 Latitude: 29° 4.9' N ( 29.08170) USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W ( -80.93670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: T 318 1970 DESIGNATION: T 318 MONUMENTATION: Bench Mark disk VM#: 5292 AGENCY: National Geodetic Survey (NGS) IDB PID#: AQ1391 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 5.1' N ( 29.08500) LONGITUDE: 80° 55.6' W ( -80.92670) The bench mark is a disk set in the top of a concrete monument 86 m (282 ft) west of the intersection of Beach Street and South Atlantic Avenue, 5 m (16 ft) south of the approximate centerline of Beach Street, 0.6 m (2 ft) east of the first power line pole west of the junction, 0.46 m (1.5 ft) west of a metal witness post, and 0.30 m (1.0 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8721138 PUBLICATION DATE: 07/02/2003 Name: HALIFAX RIVER, PONCE INLET FL NOAA Chart: 11484 Latitude: 29° 4.9' N ( 29.08170) USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W ( -80.93670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: N 320 1970 DESIGNATION: N 320 MONUMENTATION: Bench Mark disk VM#: 5293 AGENCY: National Geodetic Survey (NGS) IDB PID#: AQ1392 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 5.1' N ( 29.08500) LONGITUDE: 80° 55.9' W ( -80.93170) The bench mark is a disk set in the top of a concrete monument about 76 m (250 ft) SE of the SE side of Ponce de Leon Inlet Lighthouse, 58 m (191 ft) north of the centerline of South Peninsula Drive, 0.9 m (3 ft) west of the center of a steel gate in the fence line, 0.43 m (1.4 ft) east of a metal witness post, 0.30 m (1.0 ft) south of the south side of a hurricane fence line, and 0.06 m (0.2 ft) above ground level. BENCH MARK STAMPING: 1 1974 DESIGNATION: 872 1138 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 5294 AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1528 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 29° 4.9' N ( 29.08170) LONGITUDE: 80° 56.1' W ( -80.93500) The bench mark is a disk set flush in the top of a concrete seawall on the SE corner of the pier at the Down the Hatch Restuarant, 6 m (20 ft) south of the concrete seawall on the south side of the boat slip, 0.46 m (1.5 ft) south of the concrete ramp leading to the pier, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8721138 PUBLICATION DATE: 07/02/2003 Name: HALIFAX RIVER, PONCE INLET FL NOAA Chart: 11484 Latitude: 29° 4.9' N ( 29.08170) USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W ( -80.93670) T I D A L D A T U M S Tidal datums at HALIFAX RIVER, PONCE INLET based on: LENGTH OF SERIES: 12 MONTHS TIME PERIOD: February 1974 - January 1975 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/06/1974) = 1.584 MEAN HIGHER HIGH WATER MHHW = 0.965 MEAN HIGH WATER MHW = 0.883 North American Vertical Datum NAVD88 = 0.684 MEAN TIDE LEVEL MTL = 0.463 MEAN SEA LEVEL MSL = 0.458 MEAN LOW WATER MLW = 0.044 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/26/1975) = -0.501 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5 1974 1.779 0.896 T 318 1970 4.352 3.469 N 320 1970 3.774 2.891 1 1974 1.810 0.927
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8721138 PUBLICATION DATE: 07/02/2003 Name: HALIFAX RIVER, PONCE INLET FL NOAA Chart: 11484 Latitude: 29° 4.9' N ( 29.08170) USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W ( -80.93670) 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.