U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) To reach the bench marks from the intersection of U.S. Highway 17 and State Road A1A in Yulee, proceed NW on U.S. Highway 17 for 14.3 km (8.9 mi) to Owens Road; then turn left and proceed SW on Owens Road for 1.3 km (0.8 mi) to the junction of White Oak Plantation (a dirt road); then turn left and proceed NW on White Oak Road for 2.7 km (1.7 mi) to a guard house and a gate. From the guard house go 0.8 m (0.5 mi) north to a wooden bridge over Little St. Mary's River. The bench marks are along the road between the gate and the bridge. The tide gage and staff were on the wooden bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0006 C 1977 DESIGNATION: 872 0006 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4974 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2443 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 43.9' N ( 30.73170) LONGITUDE: 81° 43.4' W ( -81.72333) The primary bench mark is a disk located 10.2 m (335.0 ft) SSE of rod mark 872 0006 G TIDAL, 6.7 m (22.0 ft) SW of the approximate centerline of White Oak Road, 0.3 m (1.0 ft) west of a carsonite witness post and 0.3 m (1.0 ft) north of a metal witness post. The bench mark is set flush with the ground surface, crimped to a steel rod, driven into the ground, encased in a 4-inch PVC pipe, and concrete kickblock and set 0.9 m (0.3 ft) below the level of the ground. 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: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0006 A 1977 DESIGNATION: 872 0006 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4972 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2445 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 44.0' N ( 30.73330) LONGITUDE: 81° 43.5' W ( -81.72500) The bench mark is a disk located SE of the bridge, 61 m (201 ft) SSW of a power pole near the SE end of the bridge, 61 m (200 ft) SE of the SE end of the wooden bridge, 6 m (19 ft) SW of the centerline of the road, and 0.15 m (0.5 ft) NE of a witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 14.6 m (48 ft) to refusal, and encased in a 4-inch PVC pipe. BENCH MARK STAMPING: 0006 E 1977 DESIGNATION: 872 0006 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4976 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2441 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 43.8' N ( 30.73000) LONGITUDE: 81° 43.2' W ( -81.72000) The bench mark is a disk located SW of the gate and the guard house, on the left. The mark is 34.8 m (114 ft) WNW of the approximate center of a sand road leading SW, 21 m (69.5 ft) WSW of the SE corner of the building, 14.3 m (46.8 ft) SW of the SW corner of the wood guard house building, and 10.7 m (35 ft) SSW of the center of the median island where the building is located. The mark is 0.15 m (0.5 ft) NNE of a metal witness post, 0.3 m (1.0 ft) SSW of a carsonite witness post. The bench mark is set flush with the ground surface, crimped to a steel rod driven into the ground 7 inches below ground level, and encased in a 4-inch PVC pipe. Note: The mark is stamped 000E 1977 and 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 6 Station ID: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0006 F 2004 MONUMENTATION: Flange-encased Rod VM#: 19176 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 44.0' N ( 30.73333) LONGITUDE: 81° 43.5' W ( -81.72500) The bench mark is a flange encased rod located 14.1 m (46.2 ft) ESE of the south end of the SW steel guardrail at the south side of the bridge over the little St. Marys River, 9.7 m (31.7 ft) NE of the approximate centerline of White Oak Road, 7.9 m (26.0 ft) east of the SE steel guardrail of the bridge, 3.4 m (11.0 ft) east of a Bell South fiber optic marker post and 0.2 m (0.5 ft) NE of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 10.9 m (35.8 ft) with an NGS logo cap flush with the ground and the datum point is recessed 0.12 m (0.4 ft) below the level of the NGS logo cap. Access to the datum point is had through the 5-inch NGS logo cap. NOTE: A magnet was buried at the south side of the mark. BENCH MARK STAMPING: 0006 G 2004 MONUMENTATION: Flange-encased Rod VM#: 19177 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 44.0' N ( 30.73333) LONGITUDE: 81° 43.4' W ( -81.72333) The bench mark is a flange-encased rod located 102.1 m (335.0 ft) NNW of Bench Mark 0006 C 1977, 4.9 m (16.0 ft) ENE of the approximate centerline of White Oak Road, 2 m (6.5 ft) SW of an 8-inch sweet gum tree, 0.6 m (2.0 ft) SW of the SW side of a ditch, 0.6 m (2.0 ft) N and 0.5 m (1.7 ft) SE of carsonite witness post. The bench mark is a disk crimped to a stainless steel rod driven to refusal at a depth of 7.8 m (25.6 ft), with an NGS logo cap, flush with the ground and about level with White Oak Road, the datum point is recessed 0.12 m (0.4 ft) below the level of the NGS logo cap. Access to the datum point is had through the 5-inch NGS logo cap. 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 6 Station ID: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0006 H 2004 MONUMENTATION: Flange-encased Rod VM#: 19178 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 43.8' N ( 30.73000) LONGITUDE: 81° 43.3' W ( -81.72167) The bench mark is a disk located 10.8 m (35.5 ft) NE of the approximate centerline of White Oak Road, 5 m (16.5 ft) NE of a Bell South cable junction box number 11, 2.2 m (7.3 ft) SW of a 16-inch pine tree and 0.3 m (1.0 ft) NE of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 6.09 m (20.0 ft) with an NGS logo cap flush with the ground and level with white oak road. The datum point is recessed 0.12 m (0.4 ft below the level of the NGS logo cap. Access to the datum point is had through the 5-inch NGS logo cap 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: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) T I D A L D A T U M S Tidal datums at LITTLE ST. MARYS RIVER based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: February 1985 - February 1985 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 = 1.406 MEAN HIGH WATER MHW = 1.348 MEAN SEA LEVEL MSL = 0.793 North American Vertical Datum NAVD88 = 0.765 MEAN TIDE LEVEL MTL = 0.697 MEAN LOW WATER MLW = 0.046 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0006 C 1977 1.724 0.376 0006 A 1977 1.144 -0.204 0006 E 1977 3.614 2.266 0006 F 2004 1.525 0.177 0006 G 2004 1.719 0.371 0006 H 2004 1.560 0.212
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8720006 PUBLICATION DATE: 09/27/2013 Name: LITTLE ST. MARYS RIVER FL NOAA Chart: 11502 Latitude: 30° 43.9' N ( 30.73170) USGS Quad: GROSS Longitude: 81° 43.6' W ( -81.72670) 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.