U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8661299 PUBLICATION DATE: 05/20/2004 Name: LOWER TOPSAW LANDING, PEE DEE RIVER SC NOAA Chart: 11535 Latitude: 33° 36.5' N ( 33.60830) USGS Quad: PLANTERSVILLE Longitude: 79° 9.1' W ( -79.15170) To reach the tidal bench marks from the intersection of U.S. Routes 701 and 707 in Yauhannah, proceed south on U.S. Route 701 for 1.9 km (1.2 mi), then turn left and proceed east on S-22-264 for 0.5 km (0.3 mi), then continue east on a dirt road with a lower Topsaw sign for 4.2 km (2.6 mi). The bench marks are along the dirt road leading to the Pee Dee River and the adjacent open area next to the forest. The tide gage and staff were located on a platform extending from the top of the bluff to just over the river. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1299 D 1981 DESIGNATION: 866 1299 D TIDAL MONUMENTATION: Tidal Station disk VM#: 3754 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2324 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 33° 36.5' N ( 33.60830) LONGITUDE: 79° 9.0' W ( -79.15000) The primary bench mark is a disk located 56.51 m (185.4 ft) SSW of bench mark Topsaw NO 4 1934, 14.87 m (48.8 ft) WSW of the western face of a 0.91 m (3.0 ft) diameter oak tree, and 2.13 m (7.0 ft) east of the east face of a 0.61 m (2.0 ft) diameter pine tree. The bench mark is set level with ground, crimped to the top of a galvanized steel rod driven 4.9 m (16 ft) to refusal, and encased in 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8661299 PUBLICATION DATE: 05/20/2004 Name: LOWER TOPSAW LANDING, PEE DEE RIVER SC NOAA Chart: 11535 Latitude: 33° 36.5' N ( 33.60830) USGS Quad: PLANTERSVILLE Longitude: 79° 9.1' W ( -79.15170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TOPSAW NO 4 1934 DESIGNATION: TOPSAW RM 4 MONUMENTATION: Reference Mark disk VM#: 3752 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: DD2322 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 33° 36.5' N ( 33.60830) LONGITUDE: 79° 9.1' W ( -79.15170) The bench mark is a disk set flush in a square concrete monument, 9.60 m (31.5 ft) WSW of a bluff drop overlooking the River, 6.71 m (22.0 ft) SSW of an 0.5 m (1.5 ft) diameter pine tree, 0.40 m (1.3 ft) SSW of a witness post with a sign, and is at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8661299 PUBLICATION DATE: 05/20/2004 Name: LOWER TOPSAW LANDING, PEE DEE RIVER SC NOAA Chart: 11535 Latitude: 33° 36.5' N ( 33.60830) USGS Quad: PLANTERSVILLE Longitude: 79° 9.1' W ( -79.15170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TOPSAW NO 5 1934 DESIGNATION: TOPSAW RM 5 MONUMENTATION: Reference Mark disk VM#: 3753 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: DD2323 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 33° 36.5' N ( 33.60830) LONGITUDE: 79° 9.1' W ( -79.15170) The bench mark is a disk set flush in a square concrete monument, 45.08 m (147.9 ft) WSW of bench mark TOPSAW NO 4 1934, 25.91 m (85.0 ft) SSW of the SW corner of a one room shack, 21.03 m (69.0 ft) SE of an unmarked power pole, 8.20 m (26.9 ft) NNE of a triple oak tree, 0.15 m (0.5 ft) NW of a witness post with a sign, and level with the ground. BENCH MARK STAMPING: 1299 E 1981 DESIGNATION: 866 1299 E TIDAL MONUMENTATION: Tidal Station disk VM#: 3755 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2320 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 33° 36.5' N ( 33.60830) LONGITUDE: 79° 9.2' W ( -79.15330) The bench mark is a disk located 9.66 m (31.7 ft) north of a 0.46 m (1.5 ft) diameter pine tree, 4.36 m (14.3 ft) north of the centerline of the dirt road leading to the river, 2.13 m (7.0 ft) south of a drop to a large drainage ditch, and 0.64 m (2.1 ft) SSW of an unnumbered power pole. The bench mark is set 3 cm (0.1 ft) above the ground, crimped to the top of a galvanized steel rod driven 8.5 m (28 ft) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8661299 PUBLICATION DATE: 05/20/2004 Name: LOWER TOPSAW LANDING, PEE DEE RIVER SC NOAA Chart: 11535 Latitude: 33° 36.5' N ( 33.60830) USGS Quad: PLANTERSVILLE Longitude: 79° 9.1' W ( -79.15170) T I D A L D A T U M S Tidal datums at LOWER TOPSAW LANDING, PEE DEE RIVER based on: LENGTH OF SERIES: 7 MONTHS TIME PERIOD: January 1982 - July 1982 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8661139 BUCKSPORT, WACCAMAW RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.345 MEAN HIGH WATER MHW = 0.323 MEAN SEA LEVEL MSL = 0.206 MEAN TIDE LEVEL MTL = 0.177 MEAN LOW WATER MLW = 0.031 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.523 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1299 D 1981 2.843 2.520 TOPSAW NO 4 1934 3.479 3.156 TOPSAW NO 5 1934 3.131 2.808 1299 E 1981 3.796 3.473
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8661299 PUBLICATION DATE: 05/20/2004 Name: LOWER TOPSAW LANDING, PEE DEE RIVER SC NOAA Chart: 11535 Latitude: 33° 36.5' N ( 33.60830) USGS Quad: PLANTERSVILLE Longitude: 79° 9.1' W ( -79.15170) 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.