U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8727604 PUBLICATION DATE: 05/12/2004 Name: SHIRED ISLAND FL NOAA Chart: 11408 Latitude: 29° 23.9' N ( 29.39830) USGS Quad: SHIRED ISLAND Longitude: 83° 12.4' W ( -83.20670) To reach the tidal bench marks from intersection of U.S. Highway 19/98 and County Road C-351 in Cross City, proceed SW on County Road C-351 for 13.2 km (8.2 mi) to the junction of County Road C-357 (Shired Island Road), then turn left and proceed south on County Road C-357 for 17.7 km (11.0 mi) to a paved road leading west, then turn right and proceed west on the paved road for 0.3 km (0.2 mi) to the parking area for a state archeological site. The bench marks are in the area west of the parking area, at the parking area, and along the highway. The tide gauge and staff were on a pier in Shired Island . T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7604 C 1978 DESIGNATION: 872 7604 C TIDAL MONUMENTATION: Tidal Station disk VM#: 8216 AGENCY: National Ocean Survey (NOS) IDB PID#: AR1647 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 23.9' N ( 29.39830) LONGITUDE: 83° 12.3' W ( -83.20500) The primary bench mark is a disk set in the top of a concrete monument at the east edge of the parking area, 57.91 m (190.0 ft) east of bench mark 7604 B 1978, 27 m (87 ft) south of a concrete sea wall, 8 m (25 ft) east of a palm tree, 5 m (16 ft) NW of the center of a cattle gap, 1.77 m (5.8 ft) west of a wire fence, 0.46 m (1.5 ft) west of a witness sign, and 0.06 m (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8727604 PUBLICATION DATE: 05/12/2004 Name: SHIRED ISLAND FL NOAA Chart: 11408 Latitude: 29° 23.9' N ( 29.39830) USGS Quad: SHIRED ISLAND Longitude: 83° 12.4' W ( -83.20670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7604 A 1978 DESIGNATION: 872 7604 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8214 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 29° 23.9' N ( 29.39830) LONGITUDE: 83° 12.4' W ( -83.20670) The bench mark is a disk set in a concrete post, 33 m (108 ft) east of the bait house, 5 m (15 ft) NE of a large oak tree, 2 m (8 ft) west of the centerline of the boat ramp, 0.98 m (3.2 ft) SW of the NE corner of the boat ramp, 0.49 m (1.6 ft) south of the north edge of the sea wall, and 0.46 m (1.5 ft) north of the south edge of the sea wall. BENCH MARK STAMPING: 7604 B 1978 DESIGNATION: 872 7604 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8215 AGENCY: National Ocean Survey (NOS) IDB PID#: AR1648 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 23.9' N ( 29.39830) LONGITUDE: 83° 12.3' W ( -83.20500) The bench mark is a disk set in the top of a concrete monument at the west edge of the parking area, 5 m (17 ft) north of the centerline of a dirt road, 0.76 m (2.5 ft) NW of a palm tree, 0.70 m (2.3 ft) west of a powerline pole with witness sign attached.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8727604 PUBLICATION DATE: 05/12/2004 Name: SHIRED ISLAND FL NOAA Chart: 11408 Latitude: 29° 23.9' N ( 29.39830) USGS Quad: SHIRED ISLAND Longitude: 83° 12.4' W ( -83.20670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7604 D 1978 DESIGNATION: 872 7604 D TIDAL MONUMENTATION: Tidal Station disk VM#: 8217 AGENCY: National Ocean Survey (NOS) IDB PID#: AR1646 SETTING CLASSIFICATION: Concrete monument OPUS PID#: AR1646 LATITUDE: 29° 24.0' N ( 29.40000) LONGITUDE: 83° 12.1' W ( -83.20170) The bench mark is set in the top of a concrete monument, 14 m (45 ft) north of the centerline of the paved road leading west, 13 m (44 ft) WSW of the centerline of the highway, 5 m (17 ft) east of a lone palm tree, 1 m (2 ft) east of a powerline pole with a witness sign attached, and 0.06 m (0.2 ft) below ground level. BENCH MARK STAMPING: 41 ATA 11 1951 TT DESIGNATION: 41 ATA MONUMENTATION: Bench Mark disk VM#: 8218 AGENCY: US Geological Survey (USGS) IDB PID#: AR1649 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 23.9' N ( 29.39830) LONGITUDE: 83° 12.5' W ( -83.20830) The bench mark is a disk set in the top of a concrete monument, 0.5 km (0.3 mi) west of bench mark 7604 B 1978, 10 m (33 ft) south of the centerline of a track road, 7 m (22 ft) east of a twin oak tree, 6 m (20 ft) north of the approximate south shoreline, 3.29 m (10.8 ft) SE of a large cedar tree, 0.30 m (1.0 ft) east of a witness post, and 0.12 m (0.4 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8727604 PUBLICATION DATE: 05/12/2004 Name: SHIRED ISLAND FL NOAA Chart: 11408 Latitude: 29° 23.9' N ( 29.39830) USGS Quad: SHIRED ISLAND Longitude: 83° 12.4' W ( -83.20670) T I D A L D A T U M S Tidal datums at SHIRED ISLAND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: September 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 = 1.059 MEAN HIGH WATER MHW = 0.974 North American Vertical Datum NAVD88 = 0.601 MEAN TIDE LEVEL MTL = 0.567 MEAN SEA LEVEL MSL = 0.565 MEAN LOW WATER MLW = 0.161 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7604 C 1978 2.624 1.650 7604 A 1978 1.829 0.855 7604 B 1978 2.315 1.341 7604 D 1978 2.182 1.208 41 ATA 11 1951 TT 3.731 2.757
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8727604 PUBLICATION DATE: 05/12/2004 Name: SHIRED ISLAND FL NOAA Chart: 11408 Latitude: 29° 23.9' N ( 29.39830) USGS Quad: SHIRED ISLAND Longitude: 83° 12.4' W ( -83.20670) 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.