U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) To reach the tidal bench marks from the intersection of State Route A1A and State Route 206 in Crescent Beach, proceed north on State Route A1A for 2.4 km (1.5 mi) to Palmetto Road, then turn left and proceed west on Palmetto Road for 0.72 km (0.45 mi) to the boat launch site. The bench marks are along State Route A1A, Palmetto Drive, and near the boat ramp. The tide station was at the end of Palmetto Road in south St. Augustine Beach at the SW corner of the dock, which is parallel to the rock jetty at the St. Johns Public Boat Ramp Facility. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0623 B 1978 DESIGNATION: 872 0623 B TIDAL MONUMENTATION: Tidal Station disk VM#: 10728 AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1584 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 47.5' N ( 29.79170) LONGITUDE: 81° 16.0' W ( -81.26670) The primary bench mark is a disk located on the extended centerline of 5th Street, on the south side of Palmetto Drive, 6.31 m (20.7 ft) south of the centerline of Palmetto Drive, 4.9 m (16.1 ft) east of a utility pole, and 0.60 m (2.0 ft) north of a witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 9.8 m (32.0 ft) and encased in a 4-inch PVC pipe recessed 0.1 m (0.3 ft) below the ground surface.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0623 A 1978 DESIGNATION: 872 0623 A TIDAL MONUMENTATION: Tidal Station disk VM#: 10727 AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1585 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 29° 47.4' N ( 29.79000) LONGITUDE: 81° 16.1' W ( -81.26830) The bench mark is a disk set in the north concrete sea wall of the boat ramp, 14.57 m (47.8 ft) west of the NW corner of the boat ramp bulkhead, 8.26 m (27.1 ft) north of the boat ramp, 5.94 m (19.5 ft) south of the centerline of Palmetto Drive, 0.49 m (1.6 ft) NE of the top step of the boat ramp, and at ground level. BENCH MARK STAMPING: 0623 C 1978 DESIGNATION: 872 0623 C TIDAL MONUMENTATION: Tidal Station disk VM#: 10729 AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1758 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 29° 47.5' N ( 29.79170) LONGITUDE: 81° 15.9' W ( -81.26500) The bench mark is a disk set in the top of a concrete post, 8.35 m (27.4 ft) SW of the centerline of the intersection of Third Street and Palmetto Drive, 7.10 m (23.3 ft) south of the centerline of Palmetto Drive, 5.00 m (16.4 ft) west of the extended center of 3rd Street, 0.79 m (2.6 ft) east of a utility pole with 3 guy cables, 0.30 m (1.0 ft) north of a witness post, and 0.06 m (0.2 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: W 321 1970 DESIGNATION: W 321 MONUMENTATION: Bench Mark disk VM#: 10731 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AQ0363 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 29° 47.3' N ( 29.78830) LONGITUDE: 81° 15.6' W ( -81.26000) The bench mark is a disk set in the top of a concrete post, 73.15 m (240.0 ft) south of the extended centerline of Mary Street heading east to Ocean Beach, 13.69 m (44.9 ft) west of the centerline of Florida A1A, 9.30 m (30.5 ft) east of a chain-link fence corner, 0.70 m (2.3 ft) south of a witness post, and 0.40 m (1.3 ft) north of a utility pole with a transformer.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: X 321 1970 DESIGNATION: X 321 MONUMENTATION: Bench Mark disk VM#: 10732 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AQ0359 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 29° 48.1' N ( 29.80170) LONGITUDE: 81° 15.9' W ( -81.26500) The bench mark is a disk set in the top of a concrete post, 46.79 m (153.5 ft) south of the extended centerline of Palmetto Avenue, 13.99 m (45.9 ft) west of the centerline of State Route A1A, 0.49 m (1.6 ft) north of a utility pole with a transformer and one guy cable, 0.30 m (1.0 ft) east of a witness post, and 0.3 m (1 ft) below the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) T I D A L D A T U M S Tidal datums at ANASTASIA ISLAND based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: October 1978 - October 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720220 MAYPORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.534 MEAN HIGH WATER MHW = 1.436 North American Vertical Datum NAVD88 = 0.875 MEAN SEA LEVEL MSL = 0.764 MEAN TIDE LEVEL MTL = 0.745 MEAN LOW WATER MLW = 0.054 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0623 B 1978 2.035 0.599 0623 A 1978 2.203 0.767 0623 C 1978 2.151 0.715 W 321 1970 2.290 0.854 X 321 1970 2.659 1.223
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8720623 PUBLICATION DATE: 04/29/2004 Name: ANASTASIA ISLAND FL NOAA Chart: 11485 Latitude: 29° 47.6' N ( 29.79330) USGS Quad: ST. AUGUSTINE BEACH Longitude: 81° 16.3' W ( -81.27170) 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.