U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8720097 PUBLICATION DATE: 01/26/2010 Name: CUNO, LOFTON CREEK FL NOAA Chart: 11488 Latitude: 30° 34.6' N ( 30.57670) USGS Quad: HEDGES Longitude: 81° 34.3' W ( -81.57170) To reach the tidal bench marks from the intersection of U.S. Highway 17 State Road A1A (State Road 200) in Yulee, go 3.5 km (2.2 mi) south to Harts Road, turn left and go SE Harts Road for 1.4 m (0.9 mi) through a series of left, right, left turns to the junction of Haddock Road and Wilson Neck Road, turn right and go south 0.3 m (0.2 mi) to the residence at 1456 Avant Road. The bench marks are located along Wilson Neck and Avant Roads. The tide gage and staff were located on a dock behind the residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0097 D 1978 MONUMENTATION: Tidal Station disk VM#: 5019 AGENCY: National Ocean Survey (NOS) IDB PID#: BC1445 SETTING CLASSIFICATION: Concrete head wall OPUS PID#: BC1445 LATITUDE: 30° 34.8' N ( 30.58000) LONGITUDE: 81° 34.5' W ( -81.57500) The primary bench mark is a disk set flush in a concrete culvert head wall at the NE corner of the intersection of Wilson Neck and Elise Roads, 16 m (52.5 ft) south of a wood power pole, 9.1 m (30.0 ft) east of the intersection of Wilson Neck and Elise Roads, 6.6 m (21.6 ft) NE of the centerline of Wilson Neck Road, 6.3 m (20.7 ft) SE of the centerline of Elise Road, 0.2 m (0.1 mi) NW Avant Road, and 0.5 m (1.7 ft) NE of the SW end of the head wall. BENCH MARK STAMPING: CC 1 1978 CLB MONUMENTATION: Bench Mark disk VM#: 5021 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BC1443 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 30° 35.7' N ( 30.59500) LONGITUDE: 81° 35.3' W ( -81.58830) The bench mark is a disk set in the top of a round concrete monument flush with the ground and about level with Harts Road, 32.1 m (105.4 ft) SSE of a 14-inch wood power pole on the south side of Harts Road, 31.3 m (103 ft) NNW of a 14-inch cedar tree, 19.5 m (64 ft) south of the centerline intersection of Harts Road, 9.7 m (31.8 ft) SW of the centerline of Harts Road, 1.2 m (3.8 ft) south of an 8-inch wood fence post with a metal witness sign and 0.2 m (0.5 ft) NE of a carsonite witness post. NOTE: A magnet was buried on the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8720097 PUBLICATION DATE: 01/26/2010 Name: CUNO, LOFTON CREEK FL NOAA Chart: 11488 Latitude: 30° 34.6' N ( 30.57670) USGS Quad: HEDGES Longitude: 81° 34.3' W ( -81.57170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0097 F 2004 MONUMENTATION: Tidal Station disk VM#: 19200 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 34.8' N ( 30.58000) LONGITUDE: 81° 34.4' W ( -81.57333) The bench mark is a disk located 10.27 m (33.7 ft) NNE of the centerline of Avant Road, 1.82 m (6.0 ft) NW of a wooden anchor pole, 1.52 m (5.0 ft) SW of a 4-inch square concrete property corner post, and 0.91 m (3.0 ft) south of a 1.22 m (4.0 ft) high chain link fence and carsonite witness post. The bench mark is crimped to the top of a stainless steel rod driven to refusal at a depth of 16.55 m (54.3 ft) with a 5-inch NGS logo cap, flush with the ground, recessed 0.09 m (0.3 ft) below the level of the NGS logo cap and . NOTES: Access to the datum point is had through the 5-inch NGS logo cap. A magnet was buried at the south side of the mark. BENCH MARK STAMPING: 0097 G 2004 MONUMENTATION: Tidal Station disk VM#: 19201 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 34.8' N ( 30.58000) LONGITUDE: 81° 34.4' W ( -81.57333) The bench mark is a disk set in the top of a round concrete monument flush with the ground and about level with Avant Road, 9.8 (32.2 ft) east of the junction of Wilson Neck Road and Avant Road, 3.2 m (10.5 ft) NE of wooden power pole number 14304891902, 2.43 m (8.0 ft) north of the corner post of a 1.22 m (4.0 ft) high metal fence and 0.88 m (2.9 ft) NW of a concrete guard rail post and carsonite witness post. 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 3 of 5 Station ID: 8720097 PUBLICATION DATE: 01/26/2010 Name: CUNO, LOFTON CREEK FL NOAA Chart: 11488 Latitude: 30° 34.6' N ( 30.57670) USGS Quad: HEDGES Longitude: 81° 34.3' W ( -81.57170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0097 H 2004 MONUMENTATION: Tidal Station disk VM#: 19202 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 34.8' N ( 30.58000) LONGITUDE: 81° 34.4' W ( -81.57333) The bench mark is a disk set in the top of a round concrete monument flush with the ground and about level with Wilson Neck Road, 17.47 m (57.3 ft) SW and across Wilson Neck Road from the SW property corner and chain link fence corner post at 1162 Wilson Neck Road, 8.68 M (28.5 ft) SW of the centerline of Wilson Neck Road, 1.82 m (6.0 ft) west of a wooden power pole number 143043865, and 0.15 (0.5 ft) NE of a carsonite witness post. NOTE: A magnet was buried at the south side of the mark. BENCH MARK STAMPING: 0097 K 2004 MONUMENTATION: Tidal Station disk VM#: 19203 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 34.8' N ( 30.58000) LONGITUDE: 81° 34.4' W ( -81.57333) The bench mark is a disk set in the top of a round concrete monument flush with the ground and about level with Wilson Neck Road, 17 m (56.0 ft) SE of the wooden gatepost on the east side of the substation driveway, 8.74 m (28.7 ft) NE of the centerline of Wilson Neck Road, 4.45 m (14.6 ft) SE of the SE end of a 24-inch metal drainage culvert under the driveway, 1.92 m (6.3 ft) ESE of a wooden electric service pole, and 0.15 m (0.5 ft) SE of a carsonite witness post. 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 4 of 5 Station ID: 8720097 PUBLICATION DATE: 01/26/2010 Name: CUNO, LOFTON CREEK FL NOAA Chart: 11488 Latitude: 30° 34.6' N ( 30.57670) USGS Quad: HEDGES Longitude: 81° 34.3' W ( -81.57170) D A T U M S Datums at CUNO, LOFTON CREEK based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: March 1978 - July 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER Elevations of datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.187 MEAN HIGH WATER MHW = 1.135 North American Vertical Datum NAVD88 = 0.680 MEAN SEA LEVEL MSL = 0.678 MEAN TIDE LEVEL MTL = 0.598 MEAN LOW WATER MLW = 0.061 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0097 D 1978 5.125 3.990 CC 1 1978 CLB 7.196 6.061 0097 F 2004 4.223 3.088 0097 G 2004 4.500 3.365 0097 H 2004 6.992 5.857 0097 K 2004 5.165 4.030 Foot Notes: Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality 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 0097 F 2004, 0097 G 2004, 0097 H 2004 and 0097 K 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 5 of 5 Station ID: 8720097 PUBLICATION DATE: 01/26/2010 Name: CUNO, LOFTON CREEK FL NOAA Chart: 11488 Latitude: 30° 34.6' N ( 30.57670) USGS Quad: HEDGES Longitude: 81° 34.3' W ( -81.57170) 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.