U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' W To reach the tidal bench marks from Marineland, proceed 3.5 miles (5.6 km) NNW on State Highway A1A to the Fort Matanzas State Park entrance, then west to Fort Matanzas Visitors Center. The bench marks are located within the park. The tide gage and staff were located on the Fort Matanzas National Monument pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1 1974 MONUMENTATION: Survey Disk VM#: 5232 AGENCY: PID#: AQ1557 SETTING CLASSIFICATION: Rock Wall The bench mark is set flush in the top center of a coquina fence wall at the SE corner of a garden box, 45 feet (14 m) north of the north face of the Visitors Center building, 15 feet (4.6 m) south of the SE corner of a garage, and 1.5 feet (0.5 m) below and 1.0 foot (0.3 m) west of the coquina wall. BENCH MARK STAMPING: Q 321 1970 MONUMENTATION: Survey Disk VM#: 5231 AGENCY: PID#: AQ0448 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of a concrete monument at the entrance road leading west to Fort Matanzas, 154 feet (47 m) north of the centerline of the entrance road, 45 feet (14 m) west of the centerline of State Highway A1A, 42 feet (13 m) south of the centerline of a private road leading west, 2 feet (0.6 m) south of a utility pole, 2 feet (0.6 m) north of a witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2 1974 MONUMENTATION: Survey Disk VM#: 5233 AGENCY: PID#: AQ1556 SETTING CLASSIFICATION: Rock Retaining Wall The bench mark is set flush in the top center of a coquina retaining wall near the tunnel through the Visitors Center building, 10 feet (3.0 m) SE of the center of the east side of the tunnel, 1 foot (0.3 m) east of the easternmost face of the building, and 5 feet (1.5 m) above sidewalk level. BENCH MARK STAMPING: 3 1974 MONUMENTATION: Survey Disk VM#: 5234 AGENCY: PID#: AQ1555 SETTING CLASSIFICATION: Rock Retaining Wall The bench mark is set flush in the top center at the west end of the long coquina culvert near the center of the north side of the park area circled by the drive, 250 feet (76 m) east of the Visitors Center building, and 27 feet (8 m) south of and 1 foot (0.03 m) below the centerline of the south part of the drive. BENCH MARK STAMPING: G MONUMENTATION: Survey Disk VM#: 5235 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set flush in the top of a concrete monument on the east bank of Matanzas River, 0.16 mile (0.26 km) north of the park office, 800 feet (244 m) east of Fort Matanzas on Rattlesnake Island, 500 feet (152 m) NNW of Bench Mark H, 10 feet (3 m) east of the shoreline, and 0.3 foot (0.1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: H MONUMENTATION: Survey Disk VM#: 5236 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set flush in the top of a concrete monument on the east bank of Matanzas River, 0.09 mile (0.14 km) north of the park office, 18 feet (5 m) east of the shoreline, 9.0 feet (2.7 m) west of the dirt drive along the east shore of the river, and 0.3 foot (0.1 m) above ground level. BENCH MARK STAMPING: P 321 MONUMENTATION: Survey Disk VM#: 5237 AGENCY: PID#: AQ0449 SETTING CLASSIFICATION: Concrete Bridge Abutment The bench mark is set on the top of the west end of the north concrete abutment of the highway bridge over Matanzas Inlet, 20.5 feet (6.2 m) west of the centerline of the highway,and 1 foot (0.3 m) above highway level. BENCH MARK STAMPING: NO STAMPING 1 MONUMENTATION: Survey Disk VM#: 5238 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set in a concrete monument on the western shore of Matanzas River, 50 feet (15 m) NW of the NW corner of Fort Matanzas, 25 feet (8 m) SE of the dock on the west side of Matanzas River, 2.0 feet (0.6 m) SW of the shoreline, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: PL 7 E MONUMENTATION: Survey Disk VM#: 5239 AGENCY: PID: SETTING CLASSIFICATION: Galvanized Steel Rod The bench mark is 50 feet (15 m) SSE of the east end of the jetty north of the concrete dock at the park office, and 15 feet (5 m) NNW of the boat launch north of the park office.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' W T I D A L D A T U M S Tidal datums at FORT MATANZAS, MATANZAS RIVER based on: LENGTH OF SERIES: 11 MONTHS TIME PERIOD: FEBRUARY-DECEMEBER,1974 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8720220 MAYPORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (10/06/1974) = 6.90 MEAN HIGHER HIGH WATER MHHW = 4.41 MEAN HIGH WATER MHW = 4.11 MEAN TIDE LEVEL MTL = 2.16 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.85 MEAN LOW WATER MLW = 0.20 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (02/26/1975) = -1.49 * NGVD is based on elevations published in Quad 290811, Feb 1974 and NOS levels of 1970. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 1 1974 13.56 9.45 Q 321 1970 15.62 11.51 2 1974 15.80 11.69 3 1974 9.19 5.08 G 5.43 1.32 H 8.07 3.96 P 321 16.04 11.93 NO STAMPING 1 4.48 0.37 PL 7 E 7.91 3.80
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 PUBLICATION DATE: 10/15/1987 Station ID: 8720686 SUPERCEDED DATE: 04/21/2003 Name: FORT MATANZAS, MATANZAS RIVER FLORIDA NOAA Chart: 11486 Latitude: 29° 42.9' N USGS Quad: MANTANZAS Longitude: 81° 14.1' 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.