U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) To reach the tidal bench marks from the draw bridge over the Cape Fear River Highway 17 South, take the first exit pass bridge to the U.S. North Carolina Battleship Memorial and Battleship Drive. Turn right on road across from the Battleship and proceed 1.9 km (1.2 mi) to the main entrance of the U.S. Corp of Engineers, Eagle Island maintenance yard and docks. The bench marks are in the general vicinity of the yard. The tide station is located in the NE corner of the dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8120 D 1976 DESIGNATION: 865 8120 D MONUMENTATION: Tidal Station disk VM#: 554 AGENCY: National Ocean Survey (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 34° 13.3' N ( 34.22170) LONGITUDE: 77° 57.2' W ( -77.95330) The primary bench mark is a disk located at the U.S. Army Corps of Engineers Eagle Island Maintenance Yard, 11.58 m (38.0 ft) south of the north face of the sheet pile bulkhead, 9.75 m (32.0 ft) east of the center of a concrete boat ramp, and 0.61 m (2.0 ft) north of the northern side of a concrete foundation (for the old welding shop). The bench mark is at ground level, crimped to the top of a copper-clad steel rod driven to an unspecified depth, encased in a 5-inch PVC pipe and concrete kickblock which projects 0.15 m (0.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8120 C 1976 DESIGNATION: 865 8120 C TIDAL MONUMENTATION: Tidal Station disk VM#: 556 AGENCY: National Ocean Survey (NOS) IDB PID#: EA3077 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: EA3077 LATITUDE: 34° 13.6' N ( 34.22670) LONGITUDE: 77° 57.2' W ( -77.95330) The bench mark is a disk located at the U.S. Corps of Engineers (COE) Eagle Island Maintenance Yard, on the SW side of the COE property line, 23.47 m (77.0 ft) SE of the SE corner of the shop and office building, 8.35 m (27.4 ft) SW of the SW corner of the building, and 0.70 m (2.3 ft) NE of the SW fence line and behind the electrical shop. The bench mark is crimped to the top of a copper-clad steel rod driven to an unspecified depth, encased in a 5-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8120 E 1982 DESIGNATION: 865 8120 E MONUMENTATION: Tidal Station disk VM#: 557 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 34° 13.7' N ( 34.22830) LONGITUDE: 77° 57.3' W ( -77.95500) The bench mark is a disk located near the SW corner of the U.S. Corps of Engineers (COE) Eagle Island Maintenance Yard, 39.32 m (129.0 ft) SSW of the centerline of the road leading into the yard, 8.53 m (28.0 ft) east of the centerline of State Road 1300, 2.01 m (6.6 ft) NE of the NW corner of the fence around the Gregory-Poole Equipment Yard, and 0.91 m (3.0 ft) NW of the SW corner of the fence around the yard. The bench mark is crimped to the top of a galvanized steel rod driven 12.5 m (41 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 3 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8120 G 1989 DESIGNATION: 865 8120 G MONUMENTATION: Tidal Station disk VM#: 560 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 34° 13.6' N ( 34.22670) LONGITUDE: 77° 57.3' W ( -77.95500) The bench mark is a disk located at the U.S. Army Corps of Engineers (COE) Eagle Island MaintenanceYard, 31.21 M (102.4 FT) north of the centerline of the COE entrance road,11.52 m (37.8 ft) SSW of the centerline of the drive entrance to the COE parking lot, 8.41 m (27.6 ft) east of the centerline of State Road 1300, and 0.79 m (2.6 ft) west of a chainlink fence. The bench mark is 12 cm (0.4 ft) below ground level, crimped to the top of a stainless steel rod driven 12.2 m (40 ft) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8120 J 1989 DESIGNATION: 865 8120 J MONUMENTATION: Tidal Station disk VM#: 562 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete bridge support OPUS PID: LATITUDE: 34° 13.7' N ( 34.22830) LONGITUDE: 77° 57.3' W ( -77.95500) The bench mark is a disk set vertically in the SW of two concrete supports of the third bent east of the west end of the U.S. Highway 17 bridge over the Cape Fear River, 94.49 m (310.0 ft) west of State Road 1300, 51.82 m (170.0 ft) east of the base of the concrete headwall for the bridge abutement, and 1.52 m (5.0 ft) above the ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5 1937 DESIGNATION: 865 8120 TIDAL 5 USE MONUMENTATION: Tidal Station disk VM#: 16965 AGENCY: US Army Corps of Engineers (USE) IDB PID#: EA0555 SETTING CLASSIFICATION: Concrete doorsill OPUS PID: LATITUDE: 34° 13.6' N ( 34.22670) LONGITUDE: 77° 57.2' W ( -77.95330) The bench mark is a disk set inside of a 4-inch pipe in the top of the concrete doorsill of the north entrance to the storage warehouse, 4.67 m (15.3 ft) east of the east face of the office and warehouse building, 0.15 m (0.5 ft) west of teh east end of the doorsill, and about level with the sidewalk. NOTE: The bench mark cannot be leveled with standard barcode rods. (Use steel ruler or short rod instead.) BENCH MARK STAMPING: 8120 N 2014 DESIGNATION: 865 8120 N MONUMENTATION: Tidal Station disk VM#: 21248 AGENCY: US Army Corps of Engineers IDB PID: SETTING CLASSIFICATION: Concrete pier OPUS PID#: BBDL26 LATITUDE: 34° 13.6' N ( 34.22736) LONGITUDE: 77° 57.2' W ( -77.95361) The bench mark is a disk set flush in a concrete pad at the E end of the Corps Of Engineers Maint. Yard property near the NOAA Tide Station, 40.51 m (132.9 ft) ENE of the NE corner of the welding shop, 6.86 m (22.5 ft) W of the E edge of the waterfront concrete pad leading to the bulkhead, 0.22 m (0.7 ft) E of the W edge of a concrete pad next to the tide station building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8120 P 2014 DESIGNATION: 865 8120 P MONUMENTATION: Tidal Station disk VM#: 21249 AGENCY: US Army Corps of Engineers IDB PID: SETTING CLASSIFICATION: Concrete pier OPUS PID: LATITUDE: 34° 13.6' N ( 34.22728) LONGITUDE: 77° 57.2' W ( -77.95364) The mark is a disk 0.25 m (0.8 ft) E of the W edge of the SW corner set flush in a concrete pad at the E end of the Corps Of Engineers Maint. Yard property near the NOAA Tide Station, 35.47 m (116.37 ft) E of the NE corner of the welding shop, 21.97 m (72.08 ft) S of the SE corner of the NOAA Tide Station house, 6.95 m (22.8 ft) W of E the waterfront concrete pad, 1.73 m (5.7 ft) WSW of SW corner of concrete pad. BENCH MARK STAMPING: 8120 R 2015 DESIGNATION: 865 8720 R MONUMENTATION: Tidal Station disk VM#: 21808 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Set in a bridge support column OPUS PID: LATITUDE: 34° 13.7' N ( 34.22870) LONGITUDE: 77° 57.3' W ( -77.95522) The mark is vertically set in the second north support column of the Cape Fear Memorial Bridge, 31.10 m (102.0 ft) W of centerline of Battleship Rd NE, 26.20 m (86.0 ft) S of large column holding a billboard, 10.25 m (33.6 ft) E of adjacent support column in second row, 1.35 m (4.4 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8120 S 2015 DESIGNATION: 865 8120 S MONUMENTATION: Metal Rod VM#: 22538 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 34° 13.9' N ( 34.23111) LONGITUDE: 77° 57.2' W ( -77.95411) The bench mark is a stainless steel rod driven to refusal with sleeve and kick block, 52.73 m (173.0 ft) south of the centerline of a driveway leading to 109 Battleship Road, 39 m (128.0 ft) north of a large square concrete blockade, 7.32 m (24.0 ft) west of the centerline of Battleship Road. The bench mark is driven 8.7 m (28.5 ft) into the ground to refusal and is surrounded by a plastic sleeve extending to a depth of 1.5 m (5.0 ft) and encased by a concrete kickblock. BENCH MARK STAMPING: 8120 T 2015 DESIGNATION: 865 8120 T MONUMENTATION: Metal Rod VM#: 22539 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 34° 13.6' N ( 34.22694) LONGITUDE: 77° 57.3' W ( -77.95528) The bench mark is a stainless steel rod driven to refusal with a sleeve and a kick block, 26.07 m (85.5 ft) south of centerline of driveway leading to 262 Battleship Road, 4.42 m (14.5 ft) east of the centerline of Battleship Road, and 1.37 m (4.5 ft) west of a block retaining wall. The bench mark is driven 11.8 m (38.7 ft) into the ground to refusal and is surrounded by a plastic sleeve extending to a depth of 1.5 m (5.0 ft) and encased by a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) T I D A L D A T U M S Tidal datums at WILMINGTON, CAPE FEAR RIVER 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 (09/14/2018) = 2.523 MEAN HIGHER HIGH WATER MHHW = 1.427 MEAN HIGH WATER MHW = 1.351 North American Vertical Datum NAVD88 = 0.792 MEAN SEA LEVEL MSL = 0.743 MEAN TIDE LEVEL MTL = 0.699 MEAN LOW WATER MLW = 0.047 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/12/1981) = -0.567 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8120 D 1976 1.707 0.356 8120 C 1976 1.912 0.561 8120 E 1982 1.846 0.495 8120 G 1989 1.655 0.304 8120 J 1989 3.239 1.888 5 1937 1.655 0.304 8120 N 2014 2.305 0.954 8120 P 2014 2.225 0.874 8120 R 2015 3.440 2.089 8120 S 2015 1.978 0.627 8120 T 2015 1.530 0.179
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) Foot Notes: Bench marks 8120 S 2015 and 8120 T 2015 are based on one differential leveling 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 9 of 9 Station ID: 8658120 PUBLICATION DATE: 08/22/2019 Name: WILMINGTON, CAPE FEAR RIVER NC NOAA Chart: 11537 Latitude: 34° 13.6' N ( 34.22750) USGS Quad: WILMINGTON Longitude: 77° 57.2' W ( -77.95361) 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.