U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8638424 PUBLICATION DATE: 05/22/2013 Name: KINGSMILL, JAMES RIVER VA NOAA Chart: 12248 Latitude: 37° 13.2' N ( 37.22000) USGS Quad: HOG ISLAND Longitude: 76° 39.8' W ( -76.66330) To reach the tidal bench marks from the intersection of US Highway 60 and Kingsmill Road in Williamsburg, proceed south along Kingsmill Road for 3.1 km (1.9 mi) following the signs for Kingsmill Marina, then check in wth the Harbormaster at the marina store. The bench marks are in the vicinity of the marina and Kingsmill Road. The tide gauge was located on the southernmost dock at the marina, just west of the center dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8424 A 2003 DESIGNATION: 863 8424 A MONUMENTATION: Tidal Station disk VM#: 17388 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Flange-encased rod OPUS PID: LATITUDE: 37° 13.4' N ( 37.22330) LONGITUDE: 76° 39.7' W ( -76.66170) The primary bench mark is frange-encased rod located on the grassy berm north of the beach at the Kingsmill Marina boat ramp at the southern end of Kingsmill Road, 14.60 m (47.90 ft) NE of the NE corner of the concrete ramp, 3.81 m (12.50 ft) SE of the corner curb a the south end of the road, and 0.3 m (1.0 ft) west of a fiberglass witness post. The datum point is set 10 cm (0.3 ft) below the ground, being that top of a stainless steel road driven 17.10 m (56.10 ft) to refusal, in a sleeve extending to a depth of 0.9 m (3.0 ft), and encased in a 5 - inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8638424 PUBLICATION DATE: 05/22/2013 Name: KINGSMILL, JAMES RIVER VA NOAA Chart: 12248 Latitude: 37° 13.2' N ( 37.22000) USGS Quad: HOG ISLAND Longitude: 76° 39.8' W ( -76.66330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: KINGSMILL-3 1978 DESIGNATION: 863 8424 COE 3 MONUMENTATION: Survey disk VM#: 17389 AGENCY: US Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 37° 13.4' N ( 37.22330) LONGITUDE: 76° 39.8' W ( -76.66330) The bench mark is a disk set in the top of a concrete monument located on the grassy berm NW of the beach at the Kingsmill Marina and east of the marina store at the southern end of Kingsmill Road, 6.40 m (21.0 ft) east of light pole 38, 5.21 m (17.10ft) west of an 8' x 4.5' concrete slab with a park bench on it, 2.41 m (7.91 ft) south of the south edge of the sidewalk, and is set 0.10 m (0.33 ft) below the ground. BENCH MARK STAMPING: KINGSMILL-2 1978 DESIGNATION: 863 8424 COE 2 MONUMENTATION: Survey disk VM#: 17390 AGENCY: US Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 37° 13.4' N ( 37.22330) LONGITUDE: 76° 39.8' W ( -76.66330) The bench mark is a disk set in the top of a concrete monument located across from Kindsmill Road and north of the marina store at the southern end of Kingsmill Road, 16.0 m (52.50 ft) north of the flag pole at the store, 4.40 m (14.44 ft) west of the parking lot curb, 1.80 m (5.90ft) east of light pole 34, and 0.1 m (0.3 ft) below the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8638424 PUBLICATION DATE: 05/22/2013 Name: KINGSMILL, JAMES RIVER VA NOAA Chart: 12248 Latitude: 37° 13.2' N ( 37.22000) USGS Quad: HOG ISLAND Longitude: 76° 39.8' W ( -76.66330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: KINGSMILL-1 1978 DESIGNATION: 863 8424 COE 1 MONUMENTATION: Survey disk VM#: 17391 AGENCY: US Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Foundation OPUS PID: LATITUDE: 37° 13.4' N ( 37.22330) LONGITUDE: 76° 39.7' W ( -76.66170) The bench mark is a disk set in the west corner of the concrete foundation of the sewerage pumping station located on the east side of Kingsmills Road just north of the marina, 9.11 m (29.90 ft) NE of a fire hydrant, 5.21 m (17.10 ft) south of the north corner of an 18' x 25' concrete foundation, 0.91 m (3.0 ft) NW of the NW corner of the brick pump house, and 0.21 m (0.7 ft) about the natural grade. BENCH MARK STAMPING: 8424 C 2003 DESIGNATION: 863 8424 C MONUMENTATION: Tidal Station disk VM#: 17393 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete culvert wall OPUS PID: LATITUDE: 37° 13.4' N ( 37.22330) LONGITUDE: 76° 39.9' W ( -76.66500) The bench mark is a disk set in the top of a 1.5 m (5.0 ft) x .18 m (.6 ft) x .6 m (2.0 ft) concrete headwall storm water outlet located on the west side of Kingsmill Road, 19.7 m (64.6 ft) SSE of light pole 31, 3.7 m (12.3 ft) east of the centerline of the private road leading to plantation site, and 6.3 m (20.7 ft) SW of the centerline of Kingsmill Road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8638424 PUBLICATION DATE: 05/22/2013 Name: KINGSMILL, JAMES RIVER VA NOAA Chart: 12248 Latitude: 37° 13.2' N ( 37.22000) USGS Quad: HOG ISLAND Longitude: 76° 39.8' W ( -76.66330) T I D A L D A T U M S Tidal datums at KINGSMILL, JAMES RIVER based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: July 2003 - August 2003 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8638610 SEWELLS POINT, HAMPTON ROADS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.801 MEAN HIGH WATER MHW = 0.736 MEAN SEA LEVEL MSL = 0.393 MEAN TIDE LEVEL MTL = 0.392 MEAN LOW WATER MLW = 0.048 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8424 A 2003 2.365 1.629 KINGSMILL-3 1978 4.558 3.822 KINGSMILL-2 1978 4.956 4.220 KINGSMILL-1 1978 4.186 3.450 8424 C 2003 10.969 10.233
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8638424 PUBLICATION DATE: 05/22/2013 Name: KINGSMILL, JAMES RIVER VA NOAA Chart: 12248 Latitude: 37° 13.2' N ( 37.22000) USGS Quad: HOG ISLAND Longitude: 76° 39.8' W ( -76.66330) 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.