U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 Station ID: 8720011 PUBLICATION DATE: 03/23/2009 Name: CUT 1N FRONT RANGE, ST MARYS RIVER ENTR FL NOAA Chart: 11503 Latitude: 30° 42.5' N ( 30.70830) USGS Quad: FERNANDINA BEACH Longitude: 81° 27.9' W ( -81.46500) To reach the tidal bench marks from the Fernandina Beach Marina at the foot of Atlantic Avenue in Fernandina Beach, proceed west by boat for 91 m (300 ft) to Channel Marker 10, then north on the Intercoastal Waterway (Amelia River) for 3.7 km (2.3 mi) to the junction of the ICWW and St. Marys River, and the Coast Guard Cut 1N front range light tower. The bench marks are located on the top deck of the tower. The tide gage was located on the NW leg of the tower at the lower deck. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: FR CUT-1N NO. 1 1997 JAX DIST DESIGNATION: 872 0011 TIDAL 1 MONUMENTATION: Survey disk VM#: 13904 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Steel deck OPUS PID: LATITUDE: 30° 42.5' N ( 30.70830) LONGITUDE: 81° 27.9' W ( -81.46500) The bench mark is a disk epoxied into the steel deck on the top level of the front range light tower at the junction of the Intercoastal Waterway (Amelia River) and St. Marys River, 8.50 m (27.9 ft) south of the NW corner of the top deck level, 7.86 m (25.8 ft) WNW of the SE corner, 7.71 m (25.3 ft) west of bench mark FR CUT-1N NO. 2 1997 JAX DIST, and 0.85 m (2.8 ft) NE of the SW corner.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 Station ID: 8720011 PUBLICATION DATE: 03/23/2009 Name: CUT 1N FRONT RANGE, ST MARYS RIVER ENTR FL NOAA Chart: 11503 Latitude: 30° 42.5' N ( 30.70830) USGS Quad: FERNANDINA BEACH Longitude: 81° 27.9' W ( -81.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: FR CUT-1N NO. 2 1997 JAX DIST DESIGNATION: 872 0011 TIDAL 2 MONUMENTATION: Survey disk VM#: 13905 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Steel deck OPUS PID: LATITUDE: 30° 42.5' N ( 30.70830) LONGITUDE: 81° 27.9' W ( -81.46500) The bench mark is a disk epoxied into the steel deck at the top level of the front range light tower at the junction of the Intercoastal Waterway (Amelia River) and St. Marys River, 8.44 m (27.7 ft) south of the NE corner of the top deck level, 7.74 m (25.4 ft) ENE of the SW corner, 7.71 m (25.3 ft) east of bench mark FR CUT-1N NO. 1 1997 JAX DIST, and 0.82 m (2.7 ft) NW of the SE corner. BENCH MARK STAMPING: FR CUT-1N NO. 3 1997 JAX DIST DESIGNATION: 872 0011 TIDAL 3 MONUMENTATION: Survey disk VM#: 13906 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Steel deck OPUS PID: LATITUDE: 30° 42.5' N ( 30.70830) LONGITUDE: 81° 27.9' W ( -81.46500) The bench mark is a disk epoxied into the steel deck at the top level of the front range light tower at the junction of the Intercoastal Waterway (Amelia River) and St. Marys River, 8.93 m (29.3 ft) NE of the SW corner of the top level, 8.05 m (26.4 ft) NE of bench mark FR CUT-1N N0. 1 1997 JAX DIST, and 3.17 m (10.4 ft) east of the NW corner.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 Station ID: 8720011 PUBLICATION DATE: 03/23/2009 Name: CUT 1N FRONT RANGE, ST MARYS RIVER ENTR FL NOAA Chart: 11503 Latitude: 30° 42.5' N ( 30.70830) USGS Quad: FERNANDINA BEACH Longitude: 81° 27.9' W ( -81.46500) T I D A L D A T U M S Tidal datums at CUT 1N FRONT RANGE, ST MARYS RIVER ENTR based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: January 1998 - April 1998 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 = 1.981 MEAN HIGH WATER MHW = 1.876 MEAN SEA LEVEL MSL = 0.976 MEAN TIDE LEVEL MTL = 0.969 MEAN LOW WATER MLW = 0.060 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW FR CUT-1N NO. 1 1997 JAX DIST 12.871 10.995 FR CUT-1N NO. 2 1997 JAX DIST 12.840 10.964 FR CUT-1N NO. 3 1997 JAX DIST 12.855 10.979
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 Station ID: 8720011 PUBLICATION DATE: 03/23/2009 Name: CUT 1N FRONT RANGE, ST MARYS RIVER ENTR FL NOAA Chart: 11503 Latitude: 30° 42.5' N ( 30.70830) USGS Quad: FERNANDINA BEACH Longitude: 81° 27.9' W ( -81.46500) 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.