U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8727333 PUBLICATION DATE: 04/01/2004 Name: SHARK RIVER, CRYSTAL BAY FL NOAA Chart: 11409 Latitude: 28° 52.2' N ( 28.87000) USGS Quad: OZELLO Longitude: 82° 43.4' W ( -82.72330) To reach the tidal bench marks from the boat ramp at the west end of County Road C-44 at Fort Island Beach west of Crystal River, proceed SW by boat for 4.9 km (2.7 nm) to Mangrove Point. The bench marks are located along Mangrove Point. The tide gage and staff were located on a platform out in the Shark River. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7333 A 1978 DESIGNATION: 872 7333 A MONUMENTATION: Tidal Station disk VM#: 7785 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 52.2' N ( 28.87000) LONGITUDE: 82° 43.4' W ( -82.72330) The primary bench mark is a disk located on the north shore of the island, 23 m (75 ft) SW of the NE end of the island, 9 m (30 ft) from the edge of the seaward grass line in the middle of a group of large dead trees, and 1 m (2 ft) north of a witness post. The bench mark is set 0.30 m (1.0 ft) above ground level, crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8727333 PUBLICATION DATE: 04/01/2004 Name: SHARK RIVER, CRYSTAL BAY FL NOAA Chart: 11409 Latitude: 28° 52.2' N ( 28.87000) USGS Quad: OZELLO Longitude: 82° 43.4' W ( -82.72330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7333 B 1978 DESIGNATION: 872 7333 B MONUMENTATION: Tidal Station disk VM#: 7786 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 52.2' N ( 28.87000) LONGITUDE: 82° 43.4' W ( -82.72330) The bench mark is a disk located on the north shore of the island, 61 m (200 ft) west of the NE end, 38 m (125 ft) west of bench mark 7333 A 1978, 9 m (30 ft) south of the edge of the seaward grass line, and 1 m (2 ft) north of a witness post. The bench mark is set 0.55 m (1.8 ft) above ground level, crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 7333 C 1978 DESIGNATION: 872 7333 C MONUMENTATION: Tidal Station disk VM#: 7787 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 52.2' N ( 28.87000) LONGITUDE: 82° 43.4' W ( -82.72330) The bench mark is a disk located on the north shore of the island, on the mangrove line, 101 m (330 ft) west of the NE end of the island, 40 m (130 ft) west of bench mark 7333 B 1978, 3.05 m (10.0 ft) south of the edge of the seaward grass line, and 0.46 m (1.5 ft) north of the witness post. The bench mark is set 0.46 m (1.5 ft) above ground level, crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8727333 PUBLICATION DATE: 04/01/2004 Name: SHARK RIVER, CRYSTAL BAY FL NOAA Chart: 11409 Latitude: 28° 52.2' N ( 28.87000) USGS Quad: OZELLO Longitude: 82° 43.4' W ( -82.72330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7333 D 1978 DESIGNATION: 872 7333 D MONUMENTATION: Tidal Station disk VM#: 7788 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 52.2' N ( 28.87000) LONGITUDE: 82° 43.4' W ( -82.72330) The bench mark is a disk located on the north shore in the middle of the island, on a small rounded point, 46 m (150 ft) west of bench mark 7333 C 1978, 5 m (15 ft) south of the edge of the seaward grass line on the mangrove line, 2 m (8 ft) south of a large dead tree, and 1 m (2 ft) north of a witness post. The bench mark is set 1 m (2 ft) above ground level, crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 7333 E 1978 DESIGNATION: 872 7333 E MONUMENTATION: Tidal Station disk VM#: 7789 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 52.2' N ( 28.87000) LONGITUDE: 82° 43.4' W ( -82.72330) The bench mark is a disk located on the north shore of the island, 44 m (145 ft) west of bench mark 7333 D 1978, 15 m (50 ft) north of the south shore of the island, 6 m (20 ft) from the seaward edge, 3 m (10 ft) north of the mangrove line, and 1 m (2 ft) north of a witness post. The bench mark is set 0.37 m (1.2 ft) above ground level, crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8727333 PUBLICATION DATE: 04/01/2004 Name: SHARK RIVER, CRYSTAL BAY FL NOAA Chart: 11409 Latitude: 28° 52.2' N ( 28.87000) USGS Quad: OZELLO Longitude: 82° 43.4' W ( -82.72330) T I D A L D A T U M S Tidal datums at SHARK RIVER, CRYSTAL BAY based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: June 1978 - November 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.112 MEAN HIGH WATER MHW = 1.005 MEAN TIDE LEVEL MTL = 0.576 MEAN SEA LEVEL MSL = 0.570 MEAN LOW WATER MLW = 0.146 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7333 A 1978 1.038 0.033 7333 B 1978 1.046 0.041 7333 C 1978 1.152 0.147 7333 D 1978 1.155 0.150 7333 E 1978 1.191 0.186
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8727333 PUBLICATION DATE: 04/01/2004 Name: SHARK RIVER, CRYSTAL BAY FL NOAA Chart: 11409 Latitude: 28° 52.2' N ( 28.87000) USGS Quad: OZELLO Longitude: 82° 43.4' W ( -82.72330) 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.