U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) To reach the Aqua Trak (tide gage) from the junction of State Highway 206 and State Highway A1A (Ocean Shore Boulevard) in Crescent Beach, go south on State Highway A1A (Ocean Shore Boulevard) for 7.48 km (4.65 mi) to the north end of the Matanzas Inlet Bridge, continue south on State Highway A1A (Ocean Shore Boulevard) for 0.32 km (0.2 mi) to the Aqua Trak (tide gage) on the right attached to the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0692 C 1998 DESIGNATION: 872 0692 C TIDAL MONUMENTATION: Flange-encased Rod VM#: 17692 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 42.2' N ( 29.70306) LONGITUDE: 81° 13.7' W ( -81.22778) The primary bench mark is a flange-encased rod located 60.14 m (197.3 ft) north of Barratarin Drive, 17.62 m (57.8 ft) west of the centerline of State Highway A1A, 6.55 m (21.5 ft) south of the approximate centerline of the entrance driveway to Matanzas Inlet Park at 18825 A1A South, 1.13 m (3.7 ft) east of a 1.83 m (6.0 ft) tall chainlink fence and 0.37 m (1.2 ft) north of power pole Number 36540533909 and a carsonite witness post. The datum point is recessed 0.09 m (0.3 ft) below the level of the NGS logo cap, being the top of a stainless steel rod driven to refusal at a depth of 7.62 m (25.0 ft) encased in a 5-inch NGS logo cap flush with the ground and level with State Highway A1A. A magnet was placed inside of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0692 A 1998 DESIGNATION: 872 0692 A TIDAL MONUMENTATION: Bench Mark disk VM#: 17691 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bridge walkway OPUS PID#: DM1492 LATITUDE: 29° 42.3' N ( 29.70472) LONGITUDE: 81° 13.7' W ( -81.22833) The bench mark is a disk set flush in the top of the bridge deck walkway and level with State Highway A1A, about 124.36 m (408.0 ft) north of the south end of the bridge, 7.16 m (23.5 ft) west of the centerline of State Highway A1A, 1.31 m (4.3 ft) east of the concrete bridge rail, and 0.15 m (0.5 ft) west of the concrete bridge rail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0692 D 1998 DESIGNATION: 872 0692 D TIDAL MONUMENTATION: Flange-encased Rod VM#: 17693 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 42.1' N ( 29.70222) LONGITUDE: 81° 13.7' W ( -81.22750) The bench mark is a flange-encased rod located 41.45 m (136.0 ft) south of the approximate centerline of Barratarin Drive, 31.24 m (102.5 ft) north of the approximate centerline of a driveway at 8875 A1A South, 22.86 m (75.0 ft) south of the approximate centerline of the driveway at 8852 A1A South, 18.29 m (60.0 ft) west of the centerline of State Highway A1A, 2.53 m (8.3 ft) NW of power pole Number 36540553209 with 4 guy wires attached, 0.91 m (3.0 ft) WNW of a 6.10 m (20.0 ft) tall pole with a meter box attached, 0.34 m (1.1 ft) north of a right-of-way marker and 0.30 m (1.0 ft) east of a wire fence and 0.18 m (0.6 ft) east of a carsonite witness post. The datum point is recessed 0.03 m (0.1 ft) below the level of the NGS logo cap, being the top of a stainless steel rod driven to refusal at a depth of 7.99 m (26.2 ft) encased in a 5-inch NGS logo cap flush with the ground and level with State Highway A1A. A magnet was placed inside of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: COVEF 1934 1978 DESIGNATION: COVE RESET MONUMENTATION: Bench Mark disk VM#: 17695 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: AQ1723 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 41.9' N ( 29.69830) LONGITUDE: 81° 13.6' W ( -81.22670) The bench mark is set in the top of a round concrete monument located 27.58 m (90.5 ft) north of the centerline of Gene Johnson Road, 27.10 m (88.9 ft) south of the center of a driveway, 18.20 m (59.7 ft) east of the centerline of A1A, and 0.40 m (1.3 ft) west of a metal witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: M 321 DESIGNATION: M 321 RESET MONUMENTATION: Tidal Station disk VM#: 17696 AGENCY: FL Department of Transportation (FLDT) IDB PID#: AQ2717 SETTING CLASSIFICATION: Bridge guardrail OPUS PID: LATITUDE: 29° 41.9' N ( 29.69750) LONGITUDE: 81° 13.5' W ( -81.22583) The bench mark is a disk set flush in the top of the NW end of the bridge guardrail and 0.91 m (3.0 ft) above the level of State Highway A1A, 5.61 m (18.4 ft) west of the centerline of State Highway A1A, and 2.41 m (7.9 ft) south of the north end of the bridge guardrail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: K 321 DESIGNATION: K 321 RESET MONUMENTATION: Tidal Station disk VM#: 17697 AGENCY: FL Department of Transportation (FLDT) IDB PID#: AQ2715 SETTING CLASSIFICATION: Bridge guardrail OPUS PID: LATITUDE: 29° 40.8' N ( 29.67917) LONGITUDE: 81° 13.3' W ( -81.22111) The bench mark is a disk set flush in the top of the northwest end of the bridge guardrail and 0.91 m (3.0 ft) above the level of State Highway A1A, 5.61 m (18.4 ft) west of the centerline of State Highway A1A, and 2.41 m (7.9 ft) south of the north end of the bridge guardrail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) T I D A L D A T U M S Tidal datums at STATE ROAD A1A BRIDGE based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: October 2003 - October 2003 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720218 BAR PILOTS DOCK, ST JOHNS RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.255 MEAN HIGH WATER MHW = 1.159 North American Vertical Datum NAVD88 = 0.695 MEAN TIDE LEVEL MTL = 0.605 MEAN SEA LEVEL MSL = 0.594 MEAN LOW WATER MLW = 0.050 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0692 C 1998 2.978 1.819 0692 A 1998 7.043 5.884 0692 D 1998 2.443 1.284 COVEF 1934 1978 2.347 1.188 M 321 6.547 5.388 K 321 6.279 5.120 Foot Notes: Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control standards for Second Order, Class 1 leveling. It is advised that a confirmation set of levels be established for bench mark COVEF 1934 1978 to verify height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8720692 PUBLICATION DATE: 08/25/2011 Name: STATE ROAD A1A BRIDGE FL NOAA Chart: 11486 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: Matanzas Inlet Longitude: 81° 13.2' W ( -81.22000) 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.