U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 11/30/1987 Station ID: 8723534 SUPERCEDED DATE: 04/21/2003 Name: CARD SOUND BRIDGE, BARNES SOUND FLORIDA NOAA Chart: 11463 Latitude: 25° 17.2' N USGS Quad: CARD SOUND Longitude: 80° 22.2' W To reach the tidal bench marks from the intersection of U.S. Highway 1 and Card Sound Road in Florida City proceed SE on Card Sound Road for 12.1 miles (19.5 km) to the Card Sound bridge. The bench marks are located on the fishing catwalk located underneath the bridge. The tide gage and staff were located on a bridge pile base on the west end of the west fishing catwalk under the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: N 316 1970 MONUMENTATION: Survey Disk VM#: 5910 AGENCY: PID#: AC1125 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set flush in a drill hole in the south side of the concrete fishing pier below the west end of the bridge, in the base of the first pier west of the steps, 1.9 feet (0.6 m) north of the north face of the south leg of the pier, and 1.5 feet (0.3 m) below pier level. BENCH MARK STAMPING: P 316 1970 MONUMENTATION: Survey Disk VM#: 5911 AGENCY: PID#: AC1127 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set flush in a drill hole in the north side of the concrete fishing catwalk below the west end of the bridge, in the base of the fourth pier east of the steps, 1.8 feet (0.5 m) south of the south face of the north leg of the pier, and 1.5 feet (0.5 m) below pier level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 11/30/1987 Station ID: 8723534 SUPERCEDED DATE: 04/21/2003 Name: CARD SOUND BRIDGE, BARNES SOUND FLORIDA NOAA Chart: 11463 Latitude: 25° 17.2' N USGS Quad: CARD SOUND Longitude: 80° 22.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: Q 316 1970 MONUMENTATION: Survey Disk VM#: 5912 AGENCY: PID#: AC1124 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set flush in a drill hole on the south side of the concrete fishing catwalk below the west end of the bridge, in the base of the fourth pier east of the steps, 1.8 feet (0.5 m) north of the north face of the south leg, and 1.5 feet (0.5 m) below pier level. BENCH MARK STAMPING: R 316 1970 MONUMENTATION: Survey Disk VM#: 5913 AGENCY: PID#: AC1123 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set flush in a drill hole, on the north side if the concrete fishing catwalk below the west end of the bridge, in the base of the sixth pier east of the steps, 1.7 feet (0.5 m) south of the south face of the north leg of the pier, and 1.5 feet (0.5 m) below pier level. BENCH MARK STAMPING: S 316 1970 MONUMENTATION: Survey Disk VM#: 5914 AGENCY: PID#: AC1126 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set flush in a drill hole on the south side of the concrete fishing catwalk below the west end of the bridge in the base of the eighth pier east of the steps, 1.7 feet (0.5 m) north of the north face of the south leg of the pier, and 1.5 feet (0.5 m) below pier level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 11/30/1987 Station ID: 8723534 SUPERCEDED DATE: 04/21/2003 Name: CARD SOUND BRIDGE, BARNES SOUND FLORIDA NOAA Chart: 11463 Latitude: 25° 17.2' N USGS Quad: CARD SOUND Longitude: 80° 22.2' W T I D A L D A T U M S Tidal datums at CARD SOUND BRIDGE, BARNES SOUND based on: LENGTH OF SERIES: 9 MONTHS TIME PERIOD: MAY 1970-APRIL 1971 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8723289 CUTLER, BISCAYNE BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (10/18/1970) = 1.87 MEAN HIGHER HIGH WATER MHHW = 0.63 MEAN HIGH WATER MHW = 0.59 MEAN TIDE LEVEL MTL = 0.32 MEAN LOW WATER MLW = 0.06 MEAN LOWER LOW WATER MLLW = 0.00 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = -0.33 LOWEST OBSERVED WATER LEVEL (08/14/1971) = -0.98 * NGVD reference based on elevations published in Quad 250802, 1972, and NOS leveling of 1982. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW N 316 1970 6.19 5.60 P 316 1970 5.88 5.29 Q 316 1970 5.92 5.33 R 316 1970 5.88 5.29 S 316 1970 5.93 5.34
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 11/30/1987 Station ID: 8723534 SUPERCEDED DATE: 04/21/2003 Name: CARD SOUND BRIDGE, BARNES SOUND FLORIDA NOAA Chart: 11463 Latitude: 25° 17.2' N USGS Quad: CARD SOUND Longitude: 80° 22.2' 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.