U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) To reach the tidal bench marks from the junction of Parker Street and U.S. Highway 98 in Lanark, proceed SW along U.S. Highway 98 for 0.32 km (0.2 mi) to the Lanark Boat Club Marina on the south side of the highway. The bench marks are located along U.S. Highway 98. The tide gage and staff were located on the club marina dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8412 A 1976 DESIGNATION: 872 8412 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9823 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0923 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 29° 52.9' N ( 29.88170) LONGITUDE: 84° 35.7' W ( -84.59500) The primary bench mark is a disk set in top of the east end of a concrete culvert head wall on the south side of U.S. Highway 98, 52.73 m (173 ft) SW of the centerline of the entrance drive to the Lanark Village Boat Club House, 9.20 m (30.2 ft) SE of the centerline of the highway, 7.77 m (25.5 ft) NW of the corner of the juncture of a run-off channel and the boat marina.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8412 B 1976 DESIGNATION: 872 8412 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9824 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0922 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 52.9' N ( 29.88170) LONGITUDE: 84° 35.7' W ( -84.59500) The bench mark is a disk set along U.S. Highway 98, 13.53 m (44.4 ft) NW of the centerline of the highway, 11.52 m (37.8 ft) east of a 0.52 m (1.7 ft) diameter pine tree, 3.20 m (10.5 ft) NE of powerline pole # 5-3124, and 0.3 m (1 ft) SE of a witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 7.3 m (24 ft) to refusal, and encased in a PVC pipe and concrete kick-block. BENCH MARK STAMPING: 8412 C 1976 DESIGNATION: 872 8412 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9825 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0921 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 29° 52.9' N ( 29.88167) LONGITUDE: 84° 35.6' W ( -84.59330) The bench mark is a disk set in the center of a concrete culvert head wall, 24.38 m (80.0 ft) east of the center of the junction of Parker Avenue and the highway, 22.07 m (72.4 ft) NE of the centerline of a dirt road leading to a roadside park, and 7.71 m (25.3 ft) SE of the centerline of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8412 D 1976 DESIGNATION: 872 8412 D TIDAL MONUMENTATION: Tidal Station disk VM#: 9826 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0920 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 29° 53.0' N ( 29.88330) LONGITUDE: 84° 35.5' W ( -84.59170) The bench mark is a disk set in the center of a concrete culvert head wall, 52.85 m (173.4 ft) east of the centerline of Caldwell Avenue, and 6.92 m (22.7 ft) NW of the centerline of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 298 1967 DESIGNATION: A 298 MONUMENTATION: Bench Mark disk VM#: 9827 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AS0169 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 52.9' N ( 29.88170) LONGITUDE: 84° 35.6' W ( -84.59330) The bench mark is a disk located 42.98 m (141.0 ft) west of the center of the junction of Parker Avenue and U.S. Highway 98, 21.34 m (70.0 ft) NE of the centerline of Azalea Court, 15.24 m (50.0 ft) NW of the centerline of the highway, 6.71 m (22.0 ft) NE of a powerline pole, 0.40 m (1.3 ft) east of a concrete right-of-way marker, and 0.18 m (0.6 ft) west of a metal witness post. The bench mark is set 0.30 m (1.0 ft) above the level of the highway, crimped to the top of a copper-clad steel rod driven 9.60 m (32 ft) to refusal, and encased in a steel pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: L 293 1967 DESIGNATION: L 293 MONUMENTATION: Bench Mark disk VM#: 19004 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AS0168 SETTING CLASSIFICATION: Concrete Monument OPUS PID: LATITUDE: 29° 52.4' N ( 29.87333) LONGITUDE: 84° 36.5' W ( -84.60833) The bench mark is a disk located 30.33 m (99.5 ft) west of the center of the junction of Arizona Street and US Hwy 98, 26.82 m (88.0 ft) SW of the center line of the road, 14.02 m (46.0 ft) NW of the center line of the highway, 0.91 m (3.0 ft) NE of power line pole #5841824-R, in line with a row of poles 0.49 m (1.6 ft) SW of a metal witness post, about level with the highway and set in the top of a concrete post projecting 0.15 m (0.5 ft) above the level of the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) T I D A L D A T U M S Tidal datums at LANARK, ST. GEORGES SOUND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: February 1977 - April 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8728360 TURKEY POINT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.797 MEAN HIGH WATER MHW = 0.737 North American Vertical Datum NAVD88 = 0.500 MEAN TIDE LEVEL MTL = 0.461 MEAN SEA LEVEL MSL = 0.452 MEAN LOW WATER MLW = 0.185 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8412 A 1976 1.916 1.179 8412 B 1976 3.276 2.539 8412 C 1976 3.196 2.459 8412 D 1976 3.414 2.677 A 298 1967 3.801 3.064 L 293 1967 3.250 2.513 Foot Notes: Bench marks L 293 1967 are based on one differentialleveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8728412 PUBLICATION DATE: 04/04/2009 Name: LANARK, ST. GEORGES SOUND FL NOAA Chart: 11405 Latitude: 29° 52.7' N ( 29.87830) USGS Quad: MCINTYRE Longitude: 84° 35.7' W ( -84.59500) 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.