U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) To reach the tidal bench mark from the junction of State Road A1A (State Road 200), County Road 107 and Scott Road in O'Neil, go NW on A1A 3.4 km (2.1 mi) to the junction of Chester Road, turn right and go north on Chester Road 5.4 km (3.35 mi) to Roses Bluff Road, turn left and go WNW on Roses Bluff Road 2.8 km (1.75 mi) to the end of the pavement, continue NW on the sand road 2.173 km (1.35 mi) to the end of the road at the River Bluffs property, then turn left into a private drive and follow the sand drive NW for 0.6 km (0.35 mi) to the residences of Stuart Davis and John Davis. The bench marks are located along a trail road and grass drive, along the top and bottom of the bluff, east of the Davis residences. The tide gauge and staff were located on a private dock behind the residence of Stuart Davis. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0007 A 1977 DESIGNATION: 872 0007 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4977 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2434 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 42.2' N ( 30.70330) LONGITUDE: 81° 34.6' W ( -81.57667) The primary bench mark is a disk set flush in a concrete monument flush with the ground located west end of a grass drive, 67.7 m (222.0 ft) WNW of Bench Mark 0007 B 1977, 19 m (62.6 ft) SW of the SW corner of a 1.2 m (4.0 ft) wide wooden walkway, to a boat dock, 15.5 m (51.0 ft) west of the center of the steps leading to the top of the bluff, 4.0 m (13.0 ft) north of the base of the bluff, and 3.5 m (11.5 ft) south of the river bank, and 0.2 m (0.5 ft) east of a metal 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 2 of 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0007 B 1977 DESIGNATION: 872 0007 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4978 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2433 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 42.2' N ( 30.70330) LONGITUDE: 81° 33.7' W ( -81.56167) The bench mark is a disk located 67.7 m (222 ft) ESE of Tidal Bench Mark 0007 A 1977, 54.9 m (180.0 ft) NW of Tidal Bench Mark 0007 C 1977, 7.3 m (24.0 ft) south of the south bank of the Bells River, 3.05 m (10.0 ft) south of the centerline of a grassy drive, and 0.3 m (1.0 ft) north of the base of the bluff. The bench mark is a disk crimped to a copper-clad steel rod driven into the ground, encased in a 4-inch PVC pipe and concrete kickblock, 0.3 m (1.0 ft) north of a carsonite witness post and projecting 0.06 m (0.2 ft) above the level of the ground. 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 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0007 C 1977 DESIGNATION: 872 0007 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4979 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2432 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 42.2' N ( 30.70330) LONGITUDE: 81° 33.7' W ( -81.56167) The bench mark is a disk located 54.9 m (180.0 ft) SE of Bench Mark 0007 B 1977, 39 m (128.0 ft) ENE of Bench Mark 0007 D 1977, 8.53 m (28.0 ft) SW of the south edge of the marsh at the south side of the Bells River, 5.5 m (18.0 ft) ENE of the center of the drive leading to the base of the bluff, 3.35 m (11.0 ft) west of a 19-inch oak tree, 2.7 m (9.0 ft) east of an 18-inch oak tree, 1.95 m (6.4 ft) NW of an 18-inch oak tree and 0.15 m (0.5 ft) NW of a metal witness post. The bench mark is a disk crimped to a copper-clad steel rod driven into the ground, encased in a 4-inch PVC pipe and concrete kickblock, projecting 0.06 m (0.2 ft) above the level of the ground. 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 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0007 D 1977 DESIGNATION: 872 0007 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4980 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2431 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 42.2' N ( 30.70330) LONGITUDE: 81° 34.6' W ( -81.57667) The bench mark is a disk located 61.6 m (202.0 ft) east of Tidal Bench Mark 0007 E 1977, 39 m (128.0 ft) WSW of Tidal Bench Mark 0007 C 1977, 4.72 m (15.5 ft) SSW of the centerline of the drive leading to the base of the bluff, 3.26 m (10.7 ft) WNW of a 13-inch oak tree, and 0.15 m (0.5 ft) north of a metal witness post. The bench mark is a disk crimped to a copper-clad steel rod driven into the ground, encased in a 4-inch PVC pipe and concrete kickblock projecting 0.03 m (0.1 ft) above the level of the ground. NOTE: A magnet is buried at the south side of the mark. BENCH MARK STAMPING: 0007 E 1977 DESIGNATION: 872 0007 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4981 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2430 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 42.2' N ( 30.70330) LONGITUDE: 81° 34.6' W ( -81.57667) The bench mark is a disk located 61.6 m (202.0 ft) west of Tidal Bench Mark 0007 D 1977, 20.5 m (67.4 ft) ENE of the NW corner post for a deck at the one-story elevated residence of John Davis, 14.6 m (48.0 ft) NE of the NE corner deck post, 1.37 m (4.5 ft) ENE of a twin-trunk oak tree, 1.09 m (3.6 ft) north of an oak tree, and 0.21 m (0.7 ft) north of a witness post. The bench mark is a disk crimped to a copper-clad steel rod driven into the ground, encased in a 4-inch PVC pipe and concrete kickblock, projecting 0.03 m (0.1 ft) above the level of the ground. 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 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) T I D A L D A T U M S Tidal datums at ROSES BLUFF 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 = 2.047 MEAN HIGH WATER MHW = 1.942 North American Vertical Datum NAVD88 = 1.185 MEAN SEA LEVEL MSL = 1.055 MEAN TIDE LEVEL MTL = 0.999 MEAN LOW WATER MLW = 0.056 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0007 A 1977 2.779 0.837 0007 B 1977 2.892 0.950 0007 C 1977 3.003 1.061 0007 D 1977 6.494 4.552 0007 E 1977 9.053 7.111
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8720007 PUBLICATION DATE: 06/12/2009 Name: ROSES BLUFF FL NOAA Chart: 11502 Latitude: 30° 42.2' N ( 30.70330) USGS Quad: ST. MARYS Longitude: 81° 34.6' W ( -81.57670) 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.