U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 04/06/1990 Station ID: 8639207 SUPERCEDED DATE: 04/21/2003 Name: VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL VIRGINIA NOAA Chart: 12207 Latitude: 36° 49.9' N USGS Quad: VIRGINIA BEACH Longitude: 75° 58.4' W To reach the tidal bench marks from the post office in Virginia Beach, proceed south on Pacific Avenue for 1.4 miles (2.3 km) to the bridge over Lake Rudee (Inside Channel). The bench marks are at 7th Street on the bridge, east of the bridge along the boardwalk, and west of the bridge in the parking lot. The tide gage and staff were west of the bridge on a small finger pier at the Virginia Beach Fishing Center. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9207 C 1984 MONUMENTATION: Survey Disk VM#: 3505 AGENCY: PID: SETTING CLASSIFICATION: Bridge Pillar Base The bench mark is set in the most northerly pillar base underneath the bridge, 6.6 feet (2.0 m) WSW of the pillar center, 5.6 feet (1.7 m) ENE of the west pillar, 4.6 feet (1.4 m) south of the north pillar, and 4.3 feet (1.3 m) north of the south pillar. BENCH MARK STAMPING: E 311 1952 MONUMENTATION: Survey Disk VM#: 3501 AGENCY: PID#: FW0083 SETTING CLASSIFICATION: Concrete Curb The bench mark is set in the top of the west end of the concrete curb on top of a steel piling at the south end of a sea wall, 110 feet (34 m) east of the east curbing of Atlantic Avenue, 81 feet (25 m) west of the SE corner of the sea wall (in line with the north curbing of 7th Street), 1 foot (0.3 m) east of the west end of the concrete curbing, and level with Atlantic Avenue.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 04/06/1990 Station ID: 8639207 SUPERCEDED DATE: 04/21/2003 Name: VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL VIRGINIA NOAA Chart: 12207 Latitude: 36° 49.9' N USGS Quad: VIRGINIA BEACH Longitude: 75° 58.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6 1967 MONUMENTATION: Survey Disk VM#: 3502 AGENCY: PID#: FW0086 SETTING CLASSIFICATION: Concrete Wing Wall The bench mark is set flush in the top of a concrete post at the termination of the wing wall at the NE end of the bridge, 9.5 feet (2.9 m) SW of a pine tree, 2.0 feet (0.6 m) east of the roadway on the bridge, and 3.5 feet (1.1 m) above bridge level. BENCH MARK STAMPING: NO 6 1975 MONUMENTATION: Survey Disk VM#: 3503 AGENCY: PID: SETTING CLASSIFICATION: Concrete Boardwalk The bench mark is set in the SE corner of a concrete boardwalk south of 4th Street, 40 feet (12 m) east of the SE corner of Schooner Motor Inn, 8 feet (2 m) south of the second concrete rail support, 2.2 feet (0.7 m) north of the south edge of the boardwalk, and 2 feet (1 m) west of the east edge of the boardwalk. BENCH MARK STAMPING: 9207 A 1984 MONUMENTATION: Survey Disk VM#: 3504 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set in a concrete monument south of Winston Salem Avenue near Virginia Beach Fishing Center, 29.8 feet (9.1 m) north of the north edge of a wooden dock, 2.7 feet (0.8 m) south of power pole #PO44, and 0.1 foot (0.03 m) below the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 04/06/1990 Station ID: 8639207 SUPERCEDED DATE: 04/21/2003 Name: VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL VIRGINIA NOAA Chart: 12207 Latitude: 36° 49.9' N USGS Quad: VIRGINIA BEACH Longitude: 75° 58.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9207 B 1984 MONUMENTATION: Survey Disk VM#: 3506 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is south of Winston Salem Avenue near Virginia Beach Fishing Center, near the NW corner of a tackle shop, 32.0 feet (9.8 m) north of a wooden shed connected to the main building, 15.8 feet (4.8 m) SE of power pole #PO46, 15.0 feet (4.6 m) east of the parking area, 8 feet (2 m) west of the NW corner of the building, and 0.1 foot (0.03 m) below the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 04/06/1990 Station ID: 8639207 SUPERCEDED DATE: 04/21/2003 Name: VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL VIRGINIA NOAA Chart: 12207 Latitude: 36° 49.9' N USGS Quad: VIRGINIA BEACH Longitude: 75° 58.4' W T I D A L D A T U M S Tidal datums at VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: MARCH - JUNE 1984 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8638610 HAMPTON ROADS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (04/15/1984) = 6.22 MEAN HIGHER HIGH WATER MHHW = 3.91 MEAN HIGH WATER MHW = 3.57 MEAN TIDE LEVEL MTL = 1.86 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.84 MEAN LOW WATER MLW = 0.15 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (03/02/1984) = -0.62 * NGVD reference based on elevations published in Quad 360754, 1982, and NOS leveling of 1984. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 9207 C 1984 6.01 2.44 E 311 1952 13.41 9.84 6 1967 26.58 23.01 NO 6 1975 12.65 9.08 9207 A 1984 5.93 2.36 9207 B 1984 10.39 6.82
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 04/06/1990 Station ID: 8639207 SUPERCEDED DATE: 04/21/2003 Name: VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL VIRGINIA NOAA Chart: 12207 Latitude: 36° 49.9' N USGS Quad: VIRGINIA BEACH Longitude: 75° 58.4' W 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 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.