U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) To reach the tidal bench marks from the intersection of U.S. Highway 98 and State Highway 363 in St. Marks, proceed west on U.S. Highway 98 for 3.2 km (2.0 mi) to Manatee Way, just before the bridge over Wakulla River, then turn right and proceed NW on Manatee Way for 11 m (35 ft) to a fork in the road, then turn left and proceed NW on Manatee Lane for 23 m (75 ft) to another fork, then turn right and proceed NNW for 0.2 km (0.1 mi) to a private residence on the Wakulla River. The bench marks are located along U.S. Highway 98 and near the residence. The tide gage and staff were located on the bulkhead behind the residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8171 A 1977 DESIGNATION: 872 8171 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8291 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BE3967 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 10.7' N ( 30.17830) LONGITUDE: 84° 14.8' W ( -84.24670) The primary bench mark is a disk, located 13.26 m (43.5 ft) NNE of gate entrance to the private residence, 7.35 m (24.1 ft) SW of the centerline of the sand road, 6.61 m (21.7 ft) SSE of the NE fence corner of the property, and 0.76 m (2.5 ft) east of a witness sign attached to the fence. The bench mark is crimped to the top of a copper-coated steel rod driven 2.4 m (8 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8171 B 1977 DESIGNATION: 872 8171 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8292 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BE3969 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 10.6' N ( 30.17670) LONGITUDE: 84° 14.7' W ( -84.24500) The bench mark is a disk located NE of the NE end of the U.S. Highway 98 bridge over the Wakulla River, 19 m (62 ft) NW of the centerline of U.S. Highway 98, 15 m (49 ft) NE of the centerline of Manatee Way, 6.95 m (22.8 ft) east of a 1 m (3 ft) diameter live oak tree, and 0.40 m (1.3 ft) SE of a metal witness post. The bench mark is crimped to the top of a copper-coated steel rod driven 4.9 m (16 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8171 C 1977 DESIGNATION: 872 8171 C TIDAL MONUMENTATION: Tidal Station disk VM#: 8293 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BE3968 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 10.6' N ( 30.17670) LONGITUDE: 84° 14.7' W ( -84.24500) The bench mark is a disk located near the NE end of the U.S. Highway 98 bridge over the Wakulla River, 41.45 m (136.0 ft) NW of the centerline of U.S. Highway 98, 12 m (38 ft) NE of the edge of the swamp, and 0.40 m (1.3 ft) SE of a metal witness post. The bench mark is set 3 cm (0.1 ft) below ground level, crimped to the top of a copper-coated steel rod driven 2.4 m (8 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 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 15.022 DESIGNATION: 15.022 ALIAS: FLA SRD 15.022 MONUMENTATION: Survey disk VM#: 8294 AGENCY: Florida State Road Department (FLSRD) IDB PID#: BE1922 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 30° 10.5' N ( 30.17500) LONGITUDE: 84° 14.7' W ( -84.24500) The bench mark is a disk set in the top of the SE abutment at the SW end of the U.S. Highway 98 bridge over the Wakulla River, 6 m (20 ft) SE of the centerline of the highway, and 0.21 m (0.7 ft) above highway level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: NO STAMPING 1 ALIAS: FLA SRD MONUMENTATION: Bench Mark disk VM#: 8295 AGENCY: Florida State Road Department (FLSRD) IDB PID#: BE3970 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 30° 10.6' N ( 30.17670) LONGITUDE: 84° 14.7' W ( -84.24500) The bench mark is a disk set in the top of the NW abutment at the NE end of the U.S. Highway 98 bridge over the Wakulla River, 6.16 m (20.2 ft) NW of the centerline of the highway, 0.24 m (0.8 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) T I D A L D A T U M S Tidal datums at WAKULLA RIVER based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: March 1977 - June 1977 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 = 0.344 MEAN HIGH WATER MHW = 0.310 MEAN TIDE LEVEL MTL = 0.183 MEAN SEA LEVEL MSL = 0.166 MEAN LOW WATER MLW = 0.056 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.352 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8171 A 1977 2.309 1.999 8171 B 1977 1.727 1.417 8171 C 1977 0.393 0.083 15.022 4.053 3.743 NO STAMPING 1 4.058 3.748
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8728171 PUBLICATION DATE: 05/20/2004 Name: WAKULLA RIVER FL NOAA Chart: 11405 Latitude: 30° 10.6' N ( 30.17670) USGS Quad: ST. MARKS Longitude: 84° 14.8' W ( -84.24670) 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.