U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) To reach the tidal bench marks from the intersection of U.S. Highway 319 and State Road 375 in Sopchoppy, proceed south on U.S. Highway 319 for 8.7 km (5.4 mi), passing over the Ochlockonee River, to the intersection with McIntyre Road, then turn right and proceed west on McIntyre Road for 2.7 km (1.7 mi) to a four-point intersection of a wooded road, and a clearing on the south bank of the Ochlockonee River. The bench marks are along the road leading to the river, and the tide gage and staff were located south of the mouth of Crooked River. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8366 A 1978 DESIGNATION: 872 8366 A TIDAL FLDNR MONUMENTATION: Tidal Station disk VM#: 9816 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0486 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 58.9' N ( 29.98170) LONGITUDE: 84° 31.6' W ( -84.52670) The primary bench mark is a disk located 41.15 m (135.0 ft) WNW of the centerline of the road leading to the boat ramp at McIntyre, 18.90 m (62.0 ft) south of the apparent shoreline, 16.61 m (54.5 ft) ENE of a 0.30 m (1.0 ft) diameter pine tree on the edge of clearing and 1 m (3 ft) SW of a witness post. The bench mark is set at ground level, crimped to the top of a copper-clad steel rod driven 7.1 m (23.4 ft), 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 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MCINTYRE SOUTH BASE NO 1 1933 DESIGNATION: MCINTYRE S BASE RM 1 MONUMENTATION: Reference Mark disk VM#: 9814 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AS0484 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 58.8' N ( 29.98000) LONGITUDE: 84° 31.6' W ( -84.52670) The bench mark is a disk set into the top of a concrete monument, 16.46 m (54.0 ft) east of the centerline of the abandoned railroad bed, 4.57 m (15.0 ft) SW of the centerline of the sand road, 0.61 m (2.0 ft) east of a witness post, and 0.21 m (0.7 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MCINTYRE SOUTH BASE NO 2 1933 DESIGNATION: MCINTYRE S BASE RM 2 MONUMENTATION: Reference Mark disk VM#: 9815 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AS0485 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 58.8' N ( 29.98000) LONGITUDE: 84° 31.6' W ( -84.52670) The bench mark is a disk set into the the top of a concrete monument, 44.41 m (145.7 ft) south of the road junction, 18.29 m (60.0 ft) north of powerline pole # 58X1369R, 2.13 m (7.0 ft) west of the centerline of the north-south sand road, 0.61 m (2.0 ft) NW of a witness post, and 0.21 m (0.7 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: FRA 1 1978 CLB DESIGNATION: FRA 1 FLDNR MONUMENTATION: Survey disk VM#: 9817 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0483 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 58.7' N ( 29.97830) LONGITUDE: 84° 31.0' W ( -84.51670) The bench mark is a disk located on the north side of McIntyre Road,12.50 m (41.0 ft) north of powerline pole NO 58X136OR, 6.25 m (20.5 ft) north of McIntyre Road, and 2.29 m (7.5 ft) SSE of a witness post. The bench mark is set 0.06 m (0.2 ft) above ground level, crimped to the top of a copper-clad steel rod driven 10.5 m (34.5 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 5 of 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) T I D A L D A T U M S Tidal datums at MCINTYRE, OCHLOCKONEE RIVER based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: July 1978 - November 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8728229 SHELL POINT, WALKER CREEK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.674 MEAN HIGH WATER MHW = 0.622 MEAN TIDE LEVEL MTL = 0.375 MEAN SEA LEVEL MSL = 0.360 North American Vertical Datum NAVD88 = 0.276 MEAN LOW WATER MLW = 0.128 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8366 A 1978 2.684 2.062 MCINTYRE SOUTH BASE NO 1 1933 4.685 4.063 MCINTYRE SOUTH BASE NO 2 1933 4.915 4.293 FRA 1 1978 CLB 4.434 3.812
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8728366 PUBLICATION DATE: 05/28/2004 Name: MCINTYRE, OCHLOCKONEE RIVER FL NOAA Chart: 11405 Latitude: 29° 58.9' N ( 29.98170) USGS Quad: MCINTYRE Longitude: 84° 31.6' W ( -84.52670) 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.