U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) To reach the tidal bench marks from the intersection of U.S. Highway 17 and State Road A1A (State Road 200) in Yulee, go north on U.S. 17 for 7.2 km (4.5 mi) to County Road 108, turn left on County Road 108 and go 15.4 km (9.6 mi) to County 121A, turn right on County Road 121A and go north for 10.6 km (6.6 mi) to Kings Ferry and the junction of a connector road to County Road 115A and Bailey Haddock Lane. The bench marks are located in the vicinity of Bailey Haddock Lane, the connector road and County Road 115A. The tide gauge and staff were located on the NW corner of a dock on the St. Marys River behind the 2-story brick residence located east of the end of Bailey Haddock Lane. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0001 B 1977 DESIGNATION: 872 0001 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4961 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2413 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 47.1' N ( 30.78500) LONGITUDE: 81° 50.4' W ( -81.84000) The primary bench mark is a disk located 33.8 m (111.0 ft) SW of the center of a driveway entrance to Kings Plantation, 32.6 m (107.0 ft) SW of the centerline of Bailey Haddack Lane, 17.2 m (56.3 ft) SE of a 4.4 m (14.5 ft) diameter oak tree in the middle of the guardrail structure, 9.6 m (31.6 ft) east of the NE end of the guardrail in the middle of the highway, 4.5 m (14.8 ft) south of the centerline of Middle Road and 0.3 m (1.0 ft) North of a metal witness post. The bench mark is set 0.06 m (0.2 ft) below ground level, attached to a the top of a copper-clad rod, driven in the ground and encased in a 4-inch PVC pipe flush with the ground and about level with Lake Hampton Road. The disk is recessed 0.2 m (0.5 ft) below the level of the PVC pipe. NOTE: A magnet is buried at the south side of the monument.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 105 CMP 1970 DESIGNATION: 105 CMP MONUMENTATION: Tidal Station disk VM#: 4958 AGENCY: U.S. Department of Interior IDB PID#: BC2410 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 45.9' N ( 30.76500) LONGITUDE: 81° 50.9' W ( -81.84833) The bench mark is a disk set flush in the top of a concrete monument flush with the ground 1.0 km (0.6 mi) NE of the Y-fork of County Road 115A. Go 10.6 km (6.6 mi) northeasterly on County Road 115A. The bench mark is 19.02 m (62.4 ft) ESE of the centerline of County Road 115A, 4.15 m (13.6 ft) SSW of a dirt drive leading east, and 0.3 m (1 ft) west of a wood corner fence post and 0.3 m (1 ft) above the highway. NOTE A magnet is buried at the south side of the mark. BENCH MARK STAMPING: 106 CMP 1970 DESIGNATION: 106 CMP MONUMENTATION: Tidal Station disk VM#: 4959 AGENCY: U.S. Department of Interior IDB PID#: BC2411 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 46.7' N ( 30.77830) LONGITUDE: 81° 50.7' W ( -81.84500) The bench mark is a disk set flush in a concrete monument that is flush with the ground, 12.1 km (7.5 mi) NE on Road S 115A, 1.0 km (0.6 mi) NE on County Road C 108 to the y-fork of Road S 115A from the intersection of U.S. Highway 1/301 and County Road C 108. The mark bears 19.2 m (56.4 feet) NW of the centerline of Road S 115A, 5.5 m (18 feet) SW of a drainage slough. The bench mark is 0.5 m (1.5 feet) NW of a witness post. NOTE: A magnet is buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0001 D 2004 DESIGNATION: 0001 D TIDAL MONUMENTATION: Tidal Station disk VM#: 19162 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 47.2' N ( 30.78667) LONGITUDE: 81° 50.4' W ( -81.84000) The bench mark is a stainless steel rod located 0.8 km (0.05 mi) from the junction of Kolars Ferry Road and Bill Johnson Road on the left, turn left on Bill Johnson Road and go NNW for 0.16 km (0.1 mi) to a county boat ramp at the St. Marys River and the mark on the left near the NE corner of the property at 49124 Bill Johnson Road, approximately 30.4 m (100.0 ft) south of the St. Marys River, 5.2 m (16.5 ft) east of a round concrete electric transmission line pole, 4.14 m (13.6 ft) west of the west edge of a 3.96 m (13.0 ft) wide concrete drive to the boat ramp, 0.91 m (3.0 ft) SE of the NE corner post for a 1.21 m (4.0 ft) high chain link fence and 0.76 m (2.5 ft) east of the chain link fence and a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 4.0 m (13.2 ft) with an NGS logo cap, flush with the ground, about 0.3 m (1.0 ft) above the level of the concrete boat ramp drive. The datum point is recessed 0.15 m (0.5 ft) below the level of the NGS logo cap being of a stainless steel rod. Access to the datum point is had through the 5-inch NGS logo cap. NOTE A magnet is buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0001 E 2004 DESIGNATION: 0001 E TIDAL MONUMENTATION: Tidal Station disk VM#: 19163 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 47.0' N ( 30.78333) LONGITUDE: 81° 50.5' W ( -81.84170) The bench mark is a disk set flush in the top of a round concrete monument located about 113.7 m (373.0 ft) south of the approximate centerline of Kolars Ferry Road, 10.61 m (34.8 ft) ESE of the approximate centerline of County Road 115A, 8.28 m (27.5 ft) WSW of the corner fence post of the NW corner of a NE-SW power line easement, 6.24 m (20.5 ft) SSW of the innermost of 2 wire power pole anchors, 1.829 m (6.0 ft) NNE of a wooden power pole and 0.15 m (0.5 ft) west of a carsonite witness post. The bench mark is recessed 0.06 (0.2 ft) below the level of the ground and about 0.3 m (1.0 ft) below the level of County Road 115A. NOTE A magnet is buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0001 F 2004 DESIGNATION: 0001 F TIDAL MONUMENTATION: Tidal Station disk VM#: 19164 AGENCY: Florida Dept. of Environmental protection IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 46.9' N ( 30.78167) LONGITUDE: 81° 50.6' W ( -81.84333) The bench mark is a disk set in the top of a round concrete monument located about 52.12 m (171.0 ft) north of Triangle Drive, 25.36 m (83.2 ft) WNW and across County Road 115A from a wooden power pole number F292040, 13.11 m (43.0 ft) WNW of the approximate centerline of County Road 115A, 2.26 m (7.4 ft) east of a 1.219 m (4.0 ft) high hogwire fence, 1.67 m (5.5 ft) NE of a wooden powerline anchor pole and 0.15m (0.5 ft) east of a carsonite witness post. The bench mark is recessed 0.09 (0.3 ft) below the level of the ground and about level with County Road 115A. NOTE A magnet is buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NASSAU 38 2002 DESIGNATION: NASSAU 38 2002 MONUMENTATION: Horizontal Station disk VM#: 19165 AGENCY: Nassau County IDB PID#: DE5923 SETTING CLASSIFICATION: Concrete monument OPUS PID#: DE5923 LATITUDE: 30° 47.0' N ( 30.78333) LONGITUDE: 81° 50.5' W ( -81.84170) The bench mark is a brass Nassau County geodetic control disk set flush in the top of a 12-inch diameter concrete monument located (94.0 ft) (0.017 Mi) south of the centerline of Lake Hampton road, (90.0 ft) (0.017 Mi) NE of a 6-inch square concrete right of way marker projecting (18 in) above ground, (21.9 ft) (0.004 Mi) NW of the centerline of County Road 115A and (21.8 ft) (0.004 Mi) SE of a witness post. The bench mark is recessed (0.5 ft) below the ground. NOTE: A magnet is buried at the south side of the mark. NOTE: Lake Hampton Road is now Kolars Ferry Road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) T I D A L D A T U M S Tidal datums at ST. MARYS RIVER HEADWATERS based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: December 1977 - April 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.973 MEAN HIGH WATER MHW = 0.927 MEAN SEA LEVEL MSL = 0.589 MEAN TIDE LEVEL MTL = 0.497 North American Vertical Datum NAVD88 = 0.322 MEAN LOW WATER MLW = 0.066 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0001 B 1977 5.778 4.851 105 CMP 1970 6.120 5.193 106 CMP 1970 4.185 3.258 0001 D 2004 2.453 1.526 0001 E 2004 5.079 4.152 0001 F 2004 6.190 5.263 NASSAU 38 2002 5.089 4.162 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 marks 0001 D 2004, 0001 E 2004, 0001 F 2004, and NASSAU 38 2002 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: 8720001 PUBLICATION DATE: 03/25/2010 Name: ST. MARYS RIVER HEADWATERS FL NOAA Chart: 11502 Latitude: 30° 47.2' N ( 30.78670) USGS Quad: KINGS FERRY Longitude: 81° 50.4' W ( -81.84000) 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.