U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) To reach the tidal bench marks from the intersection of East Bay Street and the crosstown highway at the south foot of the northbound Cooper River Bridge, proceed SE on East Bay Street for 2.6 km (1.6 mi). Turn left onto Market Street for 0.2 km (0.1 mi) to Concord Street. Turn right and travel 0.08 km (0.05 mi) to the drive of South Carolina Port Authority. Turn left and follow the drive to a dock. The bench marks are in the vicinity of U.S. Custom House, along East Bay Street, and along Broad Street. The tide gage and staff are on the south end of the dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 13 1928 ELEV 8.264 FT DESIGNATION: 866 5530 TIDAL 13 MONUMENTATION: Tidal Station disk VM#: 611 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0085 SETTING CLASSIFICATION: Concrete dock OPUS PID#: CJ0085 LATITUDE: 32° 46.9' N ( 32.78169) LONGITUDE: 79° 55.5' W ( -79.92500) The primary bench mark is a disk set near the east end of the concrete portion of the dock and beyond the guard railway of a concrete pier landing on the approach walkway to the Ports Authority Union Pier Loading Building (note: key must be obtained to access the walkway), 18.14 m (59.5 ft) east of the north gate post at the walkway entrance, 5.46 m (17.9 ft) south of the north edge of the concrete dock, 2.41 m (7.9 ft) north of the north edge of the concrete curb at the walkway to the loading building, and 0.40 m (1.3 ft) west of the east edge of the concrete dock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 9.3=EXTRA ALIAS: NO STAMPING 1 MONUMENTATION: Chiseled Cross VM#: 613 AGENCY: Unknown IDB PID#: CJ0091 SETTING CLASSIFICATION: Step OPUS PID: LATITUDE: 32° 46.9' N ( 32.78169) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a chiseled cross in the top of the south end of the bottom step on the east side entrance of the U.S. Customhouse, at the intersection of Market and Concord Streets, 0.3 m (1 ft) south of an iron railing fence, 0.09 m (0.3 ft) north of south end of step, and about 0.15 m (0.5 ft) above walk. BENCH MARK STAMPING: 9.311 1918 DESIGNATION: 9 MONUMENTATION: Traverse Station disk VM#: 614 AGENCY: US Geological Survey (USGS) IDB PID#: CJ0084 SETTING CLASSIFICATION: Granite step OPUS PID: LATITUDE: 32° 46.8' N ( 32.78000) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a disk set in the north end of the bottom granite step at the east entrance to the U.S. Customhouse, at the intersection of Market and Concord Streets, 24.57 m (80.6 ft) west of the center of Concord Street, and 0.30 m (1.0 ft) south of the wrought iron railing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7 1921 ELEV 13.612 FT DESIGNATION: 866 5530 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 615 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0090 SETTING CLASSIFICATION: Window ledge OPUS PID: LATITUDE: 32° 46.8' N ( 32.78000) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a disk set in the top of the east end of a window ledge at the U.S. Customhouse at the intersection of Market and East Bay Streets, in the second basement window west of the SE corner of the east wing of the building, 3.51 m (11.5 ft) west of the centerline of the steps on the south side of the building and 1.40 m (4.6 ft) above ground level. BENCH MARK STAMPING: 8 1921 ELEV 11.109 FT DESIGNATION: 866 5530 TIDAL 8 MONUMENTATION: Tidal Station disk VM#: 616 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0094 SETTING CLASSIFICATION: Stone doorsill OPUS PID: LATITUDE: 32° 46.7' N ( 32.77831) LONGITUDE: 79° 55.6' W ( -79.92669) The bench mark is a disk set flush in the north corner of a stone doorsill at the entrance to 185 East Bay Street, on the west side of East Bay Street across from the driveway between 184 and 186 East Bay Street, 4.21 m (13.8 ft) SSW of an unnumbered light pole, and 2.87 m (9.4 ft) south of the NE corner of a store front.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9 1921 ELEV 11.394 FT DESIGNATION: 866 5530 TIDAL 9 MONUMENTATION: Tidal Station disk VM#: 617 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0095 SETTING CLASSIFICATION: Stone step OPUS PID: LATITUDE: 32° 46.7' N ( 32.77831) LONGITUDE: 79° 55.6' W ( -79.92669) The bench mark is a disk set flush at the south end of the top curved step of the East Bay Trading Company Restaurant, at the intersection of East Bay and Queen Streets, 9.75 m (32.0 ft) west of the centerline of East Bay Street, 6.80 m (22.3 ft) south of the centerline of Queen Street, and 4.97 m (16.3 ft) WNW of a fire hydrant. BENCH MARK STAMPING: 11 1921 ELEV 14.108 FT DESIGNATION: 866 5530 TIDAL 11 MONUMENTATION: Tidal Station disk VM#: 618 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0152 SETTING CLASSIFICATION: Stone doorsill OPUS PID: LATITUDE: 32° 46.6' N ( 32.77669) LONGITUDE: 79° 55.6' W ( -79.92669) The bench mark is a disk set flush on the east side of a stone doorsill of the Peoples Office Building at 18 Broad Street, at the junction of Broad and State Streets, 19.81 m (65.0 ft) west of the centerline of State Street, 11.03 m (36.2 ft) north of the centerline of Broad Street, 1.28 m (4.2 ft) east of the centerline of the entrance to the building, and 0.15 m (0.5 ft) above Broad Street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 12 1921 ELEV 16.552 FT DESIGNATION: 866 5530 TIDAL 12 MONUMENTATION: Tidal Station disk VM#: 619 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0098 SETTING CLASSIFICATION: Step OPUS PID: LATITUDE: 32° 46.6' N ( 32.77669) LONGITUDE: 79° 55.9' W ( -79.93169) The bench mark is a disk set flush in the top step of the northernmost Meeting Street entrance to the old Post Office, at the intersection of Broad and Meeting Streets, 17.22 m (56.5 ft) south of the centerline of Broad Street, 11.28 m (37.0 ft) west of the centerline of Meeting Street, 0.67 m (2.2 ft) north of the center of the entrance door, and 1.68 m (5.5 ft) above Broad Street. BENCH MARK STAMPING: NO 14 1928 RESET ELEV 8.327 FT DESIGNATION: 866 5530 TIDAL 14 RESET MONUMENTATION: Tidal Station disk VM#: 620 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0089 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 32° 46.8' N ( 32.78000) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a disk set in a granite retaining wall at the boat slip across Concord Street from the east entrance to the U.S. Customhouse, near the southern entrance to the South Carolina Port Authority Terminal, 11.13 m (36.5 ft) east of the centerline of Concord Street, 8.96 m (62.2 ft) north of power pole No. 320450, 1.10 m (3.6 ft) east of the west edge of the retaining wall, 0.43 m (1.4 ft) west of the east edge of the retaining wall, and 0.15 m (0.5 ft) above Concord Street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: U 16 1933 9.117 DESIGNATION: U 16 MONUMENTATION: Bench Mark disk VM#: 622 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0081 SETTING CLASSIFICATION: Building OPUS PID: LATITUDE: 32° 46.8' N ( 32.78000) LONGITUDE: 79° 55.6' W ( -79.92669) The bench mark is a disk set vertically in a brick wall near the east corner of the L.A. Grill Restaurant, at the intersection of East Bay and North Market Streets, 3.29 m (10.8 ft) north of the north curb of North Market Street, 0.64 m (2.1 ft) west of the east corner of a brick building entrance way, and 1.04 m (3.4 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: PORT 1962 DESIGNATION: PORT MONUMENTATION: Survey disk VM#: 623 AGENCY: US Army Corps of Engineers (USE) IDB PID#: CJ0326 SETTING CLASSIFICATION: Concrete pier OPUS PID#: CJ0326 LATITUDE: 32° 46.8' N ( 32.78078) LONGITUDE: 79° 55.4' W ( -79.92364) The bench mark is a disk set flush on the SE edge of the passenger terminal pier of the South Carolina Port Authority, 3.08 m (10.1 ft) SSE of the SE corner of the 3x3 m (9x9 ft) concrete block building housing the U.S. Department of Commerce National Ocean Service Tide Station, 1.80 m (5.9 ft) NE of the SW edge of the pier, and 1.25 m (4.1 ft) NW of the SE edge of the pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 10.945 DESIGNATION: 866 5530 TIDAL BASIC ALIAS: BASIC MONUMENTATION: Bench Mark disk VM#: 624 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: CJ0093 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 46.8' N ( 32.78000) LONGITUDE: 79° 55.5' W ( -79.92500) The bench mark is a disk set in an 18-inch concrete post near the west entrance steps to the U.S. Custom House, 33.50 m (109.9 ft) east of the center of East Bay Street, 11.52 m (37.8 ft) ESE of the southernmost of two flag poles, 9.54 m (31.3 ft) south of the south face of the large landing at the west entrance steps, 4.18 m (13.7 ft) north of the north edge of the granite curbing of a grassy area, 3.26 m (10.7 ft) WNW of a 0.27 m (0.9 ft) palmetto tree, and projecting 0.67 m (2.2 ft). The west face of the post has formation of colored rocks spelling United States Coast and Geodetic Survey Basic Bench Mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) T I D A L D A T U M S Tidal datums at CHARLESTON, COOPER RIVER ENTRANCE based on: LENGTH OF SERIES: 19 YEARS TIME PERIOD: January 1983 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/21/1989) = 3.817 MEAN HIGHER HIGH WATER MHHW = 1.757 MEAN HIGH WATER MHW = 1.648 North American Vertical Datum NAVD88 = 0.957 MEAN SEA LEVEL MSL = 0.891 MEAN TIDE LEVEL MTL = 0.853 MEAN LOW WATER MLW = 0.057 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (03/13/1993) = -1.245 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 13 1928 ELEV 8.264 FT 3.177 1.529 9.3=EXTRA 3.496 1.848 9.311 1918 3.499 1.851 7 1921 ELEV 13.612 FT 4.812 3.163 8 1921 ELEV 11.109 FT 4.054 2.406 9 1921 ELEV 11.394 FT 4.126 2.478 11 1921 ELEV 14.108 FT 4.953 3.304 12 1921 ELEV 16.552 FT 5.711 4.062 NO 14 1928 RESET ELEV 8.327 FT 3.188 1.539 U 16 1933 9.117 3.443 1.794 PORT 1962 3.491 1.842 10.945 3.983 2.334
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 10 Station ID: 8665530 PUBLICATION DATE: 04/29/2003 Name: CHARLESTON, COOPER RIVER ENTRANCE SC NOAA Chart: 11524 Latitude: 32° 46.9' N ( 32.78170) USGS Quad: CHARLESTON Longitude: 79° 55.5' W ( -79.92500) 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.