U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) To reach the tidal bench marks from the post office in Port Salerno, proceed 0.72 km (0.45 mi) SE on State Road A1A to Anchor Avenue, then 0.3 km (0.2 mi) NW on Anchor Avenue to Horseshoe Point Road, then 2.49 km (1.55 mi) ENE on Horseshoe Point Road to its end. The bench marks are located at Horseshoe Point. The tide gage and staff were located on a finger pier on the south side of Horseshoe Point. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1972 DESIGNATION: 872 2381 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 5454 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AF6966 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 9.2' N ( 27.15333) LONGITUDE: 80° 10.3' W ( -80.17170) The primary bench mark is a disk set flush in the Horseshoe Point concrete sea wall, 50.29 m (165.0 ft) east of the SW end of the sea wall, and 10.06 m (33.0 ft) east of the easternmost of four finger piers.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1972 DESIGNATION: 872 2381 NO 3 1972 MONUMENTATION: Tidal Station disk VM#: 5456 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AF6963 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 9.2' N ( 27.15333) LONGITUDE: 80° 10.3' W ( -80.17170) The bench mark is a disk set flush in the Horseshoe Point concrete sea wall, 17.37 m (57.0 ft) WNW of bench mark NO 2 1972, 7.32 m (24.0 ft) north of the SW corner of the sea wall, and 0.52 m (1.7 ft) south of the NW corner of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SNAKE 1930 1979 DESIGNATION: Snake Reset MONUMENTATION: Bench Mark disk VM#: 5458 AGENCY: National Geodetic Survey (NGS) IDB PID#: AF6967 SETTING CLASSIFICATION: Concrete post OPUS PID#: AF6967 LATITUDE: 27° 9.2' N ( 27.15333) LONGITUDE: 80° 10.3' W ( -80.17170) The bench mark is a disk set in the top of a concrete post projecting 12-inches, 0.21 m (0.7 ft) west of a witness post 4.15 m (13.6 ft) north of Horseshoe Point Road centerline, 4.57 m (15.0 ft) SW of a seagrape tree, and about 71.93 m (236.0 ft) west of the east end of Horseshoe Point sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Mar 8 1980 DESIGNATION: Mar 8 FLDT MONUMENTATION: Bench Mark disk VM#: 18911 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: AF6961 SETTING CLASSIFICATION: Concrete Bridge Rail OPUS PID: LATITUDE: 27° 8.8' N ( 27.14667) LONGITUDE: 80° 11.5' W ( -80.19167) The bench mark is a disk located is 5.55 m (18.2 ft) NNW of Horseshoe Point Road centerline, 0.64 m (2.1 ft) WSW of the east end of the concrete rail, 16.31 m (53.5 ft) WSW of the east end of a metal guardrail, and 0.91 m (3.0 ft) above the road. BENCH MARK STAMPING: 2381 A 2005 DESIGNATION: 872 2381 A TIDAL MONUMENTATION: Tidal Station disk VM#: 18912 AGENCY: Florida Department of Environmental Protection IDB PID#: SETTING CLASSIFICATION: Concrete Monument OPUS PID#: DM3745 LATITUDE: 27° 9.2' N ( 27.15333) LONGITUDE: 80° 10.3' W ( -80.17167) The bench mark is a disk set flush in the top of a concrete monument on the North edge of pavement and level with Horseshoe Point Road 8.11 m (26.6 ft) east of the mark designated Snake Reset, 6.10 m (20.0 ft) south of the waters edge of Great Pocket, 3.35 m (11.0 ft) north of the approximate centerline of Horseshoe Point Road, 2.99 m (9.8 ft) south of a cinderblock sea wall, and 2.80 m (9.2 ft) south of a carsonite witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) T I D A L D A T U M S Tidal datums at GREAT POCKET,ST. LUCIE INLET based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: August 1972 - December 1972 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8723170 MIAMI BEACH (CITY PIER) Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: North American Vertical Datum NAVD88 = 0.477 MEAN HIGHER HIGH WATER MHHW = 0.395 MEAN HIGH WATER MHW = 0.363 MEAN TIDE LEVEL MTL = 0.202 MEAN SEA LEVEL MSL = 0.201 MEAN LOW WATER MLW = 0.040 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1972 1.304 0.941 NO 3 1972 1.168 0.805 SNAKE 1930 1979 1.493 1.130 Mar 8 1980 3.664 3.301 2381 A 2005 1.597 1.234 Foot Notes: Bench marks Mar 8 1980 and 2381 A 2005 are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8722381 PUBLICATION DATE: 07/06/2009 Name: GREAT POCKET,ST. LUCIE INLET FL NOAA Chart: 11474 Latitude: 27° 9.3' N ( 27.15500) USGS Quad: ST. LUCIE INLET Longitude: 80° 10.3' W ( -80.17170) 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.