U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) To reach the tidal bench marks from the intersection of State Highway A1A and 105A in Amelia City proceed south on State Highway A1A for 10.5 km (6.5 mi) to the SW end of the bridge over Sawpit Creek. The benchmarks are located on the fifth set of pilings north of the south end of the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0168 C 1978 DESIGNATION: 872 0168 C TIDAL MONUMENTATION: Tidal Station disk VM#: 5055 AGENCY: National Ocean Survey (NOS) IDB PID#: BC1404 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 27.7' N ( 30.46167) LONGITUDE: 81° 25.6' W ( -81.42694) The primary bench mark is a disk located 0.5 km (0.3 mi) east of Simpson Creek, 0.2 km (0.1 mi) west of bench mark D 326 1970, 19.8 m (65.0 ft) south of the intersection of the centerline of State Road A1A (State Road 105) with the center of the sand driveway into the park, 13.0 m (47.2 ft) SSE of wood power pole number 30030 30T, 6.3 m (20.7 ft) SW of a large twin pine tree, 5.0 m (16.5 ft) SSW of a cluster of three 10-inch wooden posts at the south side of the park entrance sign, 4.4 m (14.3 ft) east of the sand driveway, and 0.3 m (1.0 ft) west of a witness post. The mark is crimped to the top of a copper-clad steel rod driven into the ground, and encased in a 4-inch PVC pipe inside a concrete kickblock projecting 0.1 m (0.4 ft) above ground level. NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: D 326 1970 DESIGNATION: D 326 MONUMENTATION: Tidal Station disk VM#: 5056 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC0434 SETTING CLASSIFICATION: Concrete bridge walkway OPUS PID: LATITUDE: 30° 27.7' N ( 30.46111) LONGITUDE: 81° 25.5' W ( -81.42500) The bench mark is a disk on the top of the west end of the south bridge walkway of the Myrtle Creek Bridge (H 1544 1949) on State Road A1A, 0.6 km (0.4 mi) east of Simpson Creek, 3.9 m (12.7 ft) north of the centerline of the State Road A1A and 0.3 m (1.0 ft) east of the west end of the walkway. The mark is a disk set flush in the top of the concrete bridge walkway and 0.3 m (1.0 ft) above the level of the State Road A1A (State Road 105).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: E 326 1970 DESIGNATION: E 326 MONUMENTATION: Tidal Station disk VM#: 5057 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC0433 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 30° 27.8' N ( 30.46333) LONGITUDE: 81° 26.0' W ( -81.43250) The bench mark is a disk set flush on top of the west end of the north concrete walkway of the bridge over Simpson Creek (H 1544 1949) on State Road A1A (State Road 105), 4.0 m (13.0 ft) north of the centerline of A1A, 0.3 m (1.0 ft) east of the west end of the walkway, 0.3 m (1.0 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: F 326 1970 DESIGNATION: F 326 MONUMENTATION: Tidal Station disk VM#: 5058 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC0432 SETTING CLASSIFICATION: Concrete Bridge Abutment OPUS PID: LATITUDE: 30° 28.0' N ( 30.46686) LONGITUDE: 81° 26.4' W ( -81.43944) The bench mark is a disk set in a top of a round concrete monument projecting 0.2 m (0.5 ft) above ground level, 13.0 m (42.0 ft) NE of the centerline of State Road A1A (State Road 105), 9.8 m (32.0 ft) south of Big Pine Trail leading east, 4.0 m (14.0 ft) west of a large twin trunked oak tree, 0.5 m (1.5 ft) north of a metal witness post and 0.2 m (0.5 ft) west of a carsonite witness post. NOTE: A magnet was buried at the south side of the mark. BENCH MARK STAMPING: 0168 D 2004 DESIGNATION: 872 0168 D TIDAL MONUMENTATION: Tidal Station disk VM#: 19265 AGENCY: FL Dept. of Environmental Protection (FLDEP) IDB PID#: DH8955 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 27.8' N ( 30.46389) LONGITUDE: 81° 26.0' W ( -81.43350) The bench mark is a disk located 14.8 m (48.6 ft) SW of the centerline of State Road A1A (State Road 105), 2.0 m (6.5 ft) south of a 7-inch wooden corner post for a 1.2 m (4.0 ft) high hogwire fence, 0.5 m (1.8 ft) SE of the hogwire fence and 0.2 m (0.5 ft) SE of a carsonite witness post. The datum point is recessed 0.1 m (0.2 ft) below the level of the NGS logo cap, being crimped to the top of a stainless steel rod driven to refusal at a depth of 14.8 m (48.5 ft) with a 5-inch NGS logo cap flush with the ground and about 0.3 m (1.0 ft) below the level of State Road A1A (State Road 105). NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L D A T U M S Tidal datums at SIMPSON CREEK based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: April 1978 - August 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.691 MEAN HIGH WATER MHW = 1.586 North American Vertical Datum NAVD88 = 0.968 MEAN SEA LEVEL MSL = 0.829 MEAN TIDE LEVEL MTL = 0.812 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0168 C 1978 3.090 1.504 D 326 1970 4.383 2.797 E 326 1970 5.162 3.576 F 326 1970 4.842 3.256 0168 D 2004 4.370 2.784 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 0168 D 2004 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 6 of 6 Station ID: 8720168 PUBLICATION DATE: 11/13/2009 Name: SIMPSON CREEK FL NOAA Chart: 11488 Latitude: 30° 27.9' N ( 30.46500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) 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.