U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 09/01/1987 Station ID: 8723178 SUPERCEDED DATE: 04/21/2003 Name: MIAMI BEACH, GOVERNMENT CUT FLORIDA NOAA Chart: 11468 Latitude: 25° 45.8' N USGS Quad: MIAMI Longitude: 80° 7.8' W To reach the tidal bench marks from the intersection of 5th Street and Collins Avenue (State Highway A1A) in Miami Beach, proceed south on Collins Avenue for 0.5 mile (0.8 km) to Biscayne Street, then east on Biscayne Street for 0.1 mile (0.2 km) to a gate leading onto the beach, then south along the beach to the concrete fishing pier at the mouth of Government Cut. The bench marks are located in the vicinity of the pier and the city park, and the tide station is located at the midpoint of the concrete fishing pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3178 A 1985 MONUMENTATION: Survey Disk VM#: 5788 AGENCY: PID: SETTING CLASSIFICATION: Concrete Pier The bench mark is set flush in the top of a concrete pile cap at the west end of the concrete fishing pier on Government Cut, 447 feet (136 m) WNW of Bench Mark MH-27 1978, 27.5 feet (8.4 m) NNE of the SW corner of the concrete pier, 21 feet (6 m) SSW of the center line of the asphalt promenade, 1 foot (0.3 m) WNW of the west end of the concrete pier, and 0.5 foot (0.2 m) below the level of the pier. BENCH MARK STAMPING: R 74 1974 MONUMENTATION: Survey Disk VM#: 5786 AGENCY: PID: SETTING CLASSIFICATION: Concrete Bulkhead The bench mark is set flush in the top of the SW corner of a concrete bulkhead running NE/SW along the beach, SSE of the SE corner of the pilots building, 1.7 feet (0.5 m) NE of the SW edge of the bulkhead with a chain link fence adjacent to it, and 1.6 feet (0.5 m) NW of the SE edge of the bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 09/01/1987 Station ID: 8723178 SUPERCEDED DATE: 04/21/2003 Name: MIAMI BEACH, GOVERNMENT CUT FLORIDA NOAA Chart: 11468 Latitude: 25° 45.8' N USGS Quad: MIAMI Longitude: 80° 7.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: MH-27 1978 JAX FLA MONUMENTATION: Survey Disk VM#: 5787 AGENCY: PID: SETTING CLASSIFICATION: Concrete Pier The bench mark is set flush in the concrete pier deck at the SE end of the concrete pier along the north shore of Government Cut, 31.2 feet (9.5 m) SW of the NE edge of the deck, 5.0 feet (1.5 m) NW of the SE edge of the deck, 5.0 feet (1.5 m) NE of the SW edge of the deck.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 09/01/1987 Station ID: 8723178 SUPERCEDED DATE: 04/21/2003 Name: MIAMI BEACH, GOVERNMENT CUT FLORIDA NOAA Chart: 11468 Latitude: 25° 45.8' N USGS Quad: MIAMI Longitude: 80° 7.8' W T I D A L D A T U M S Tidal datums at MIAMI BEACH, GOVERNMENT CUT based on: LENGTH OF SERIES: 11 MONTHS TIME PERIOD: FEBRUARY-DECEMBER 1985 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8723080 HAULOVER PIER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (09/16/1985) = 3.87 MEAN HIGHER HIGH WATER MHHW = 2.53 MEAN HIGH WATER MHW = 2.48 MEAN TIDE LEVEL MTL = 1.32 MEAN LOW WATER MLW = 0.16 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (04/07/1985) = -1.20 Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 3178 A 1985 12.27 9.79 R 74 1974 10.73 8.25 MH-27 1978 JAX FLA 12.92 10.44
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 09/01/1987 Station ID: 8723178 SUPERCEDED DATE: 04/21/2003 Name: MIAMI BEACH, GOVERNMENT CUT FLORIDA NOAA Chart: 11468 Latitude: 25° 45.8' N USGS Quad: MIAMI Longitude: 80° 7.8' 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.