U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) To reach the tidal bench marks from the Field Operations Division (FOD) office in Chesapeake, VA. proceed to Interstate 64 west towards Norfolk and take I-564 to the Naval Base and Tausigg Blvd. Take Tausigg Blvd. to Gate 2 and follow Decatur Avenue around to Pier 6. Tide gauge is located near the south end of Pier 6, and the bench marks are in the vicinity of Pier 6 and Piersey Street. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8610 G 2006 DESIGNATION: 863 8610 G MONUMENTATION: Tidal Station disk VM#: 18111 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Pier OPUS PID: LATITUDE: 36° 56.7' N ( 36.94444) LONGITUDE: 76° 19.7' W ( -76.32881) The primary bench mark is disk set in a pier, 51.20 m (168.0 ft) south of the second bollard along the bulkhead, 38.22 m (125.39 ft) west of the centerline of Decatur Street, 37.45 m (122.9 ft) north of the NE corner of pier 6, 0.30 m (1.0 ft) east of the west face of the bulkhead, and 0.24 m (0.8 ft) above the concrete parking lot.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8610 F 2006 DESIGNATION: 863 8610 F MONUMENTATION: Tidal Station disk VM#: 18112 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pier OPUS PID#: BBBX81 LATITUDE: 36° 56.6' N ( 36.94271) LONGITUDE: 76° 19.7' W ( -76.32869) The bench mark is a disk set in a concrete pier, 6.80 m (22.3 ft) north of the south face of the concrete pier, 4.90 m (16.1 ft) west of the western edge of a cleat on the east face of the concrete pier, and 0.35 m (1.1 ft) east of the eastern edge of a cleat on the west face of the concrete pier. BENCH MARK STAMPING: 8610 H 2009 DESIGNATION: 863 8610 H MONUMENTATION: Tidal Station disk VM#: 19456 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.8' N ( 36.94650) LONGITUDE: 76° 19.7' W ( -76.32897) The bench mark is set in the edge of a massive concrete pier, 21.80 m (71.5 ft) north of the north face of Pier 7, 18.3 m (60.0 ft) south of a steel cleat on the western edge of a pier wall, 0.48 m (1.6 ft) east of the west face of pier wall, and 0.31 m (1.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8610 J 2009 DESIGNATION: 863 8610 J MONUMENTATION: Tidal Station disk VM#: 19457 AGENCY: National Ocean Survey/Service(NOS) IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.9' N ( 36.94886) LONGITUDE: 76° 19.7' W ( -76.32856) The bench mark is 14.43 m (47.3 ft) NE of NE corner of warehouse building, 10.52 m (34.5 ft) WNW of centerline of Decatur Avenue, 6.20 m (20.3 ft) ESE of westerly face of pier wall, and 0.12 m (0.4 ft) above ground. BENCH MARK STAMPING: 8610 K 2009 DESIGNATION: 863 8610 K MONUMENTATION: Tidal Station disk VM#: 19458 AGENCY: National Ocean Survey/Service(NOS) IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.6' N ( 36.94322) LONGITUDE: 76° 19.7' W ( -76.32769) The bench mark is set in the concrete pier wall on the east side of the small boats warehouse, 18.23 m (59.8 ft) SW of the centerline of Decatur Ave/Admiral Taussig Boulevard, 1.48 m (4.9 ft) east of the NE corner of the small boats warehouse, and 0.32 m (1.0 ft) north of the southerly face of pier wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8610 L 2010 DESIGNATION: 863 8610 L MONUMENTATION: Tidal Station disk VM#: 19648 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.6' N ( 36.94297) LONGITUDE: 76° 19.6' W ( -76.32725) Bench mark is a survey disc set in the concrete pier on the Norfolk naval base, 4.38 m (14.4 ft) southwest from the southwest corner of the NNSY divers underwater repair building, 0.60 m (2.0 ft) east from the pier face running north and south on the west side of the NNSY building, 0.60 m (2.0 ft) north from the pier face bulkhead running east and west on the south side of NNSY building. BENCH MARK STAMPING: 8610 M 2010 DESIGNATION: 863 8610 M MONUMENTATION: Tidal Station disk VM#: 19649 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Concrete nabal pier OPUS PID: LATITUDE: 36° 56.6' N ( 36.94297) LONGITUDE: 76° 19.6' W ( -76.32639) The bench mark is set flush in the top retaining wall bulkhead near the east end by the double gate leading to boat staging area, 10.55 m (34.6 ft) west from fire hydrant number 1236 on west side of double gate leading to boat staging area, 4.60 m (15.1 ft) north from a 0.66 m (2.2 ft) boat cleat on the northern end of bulkhead running parallel to Second St, 0.85 m (2.8 ft) east from centerline of ladder attached to bulkhead face of the pier running parallel with admiral Tussig boulevard, set 0.25 m (0.8 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8610 N 2010 DESIGNATION: 863 8610 N MONUMENTATION: Tidal Station disk VM#: 19650 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.8' N ( 36.94692) LONGITUDE: 76° 19.7' W ( -76.32844) Bench mark is set flush in concrete base at southeast corner of the fleet and industrial supply center sign at intersection of Decatur avenue and Gilbert St on northeast corner set in sign footing, 11.45 m (37.6 ft) north from the center line Gilbert St, 4.27 m (14.0 ft) west from the southwest pillar holding up the fleet center supply sign, 03.0 m (9.8 ft) south from the northeast pillar holding up fleet center supply sign, 0.20 m (0.7 ft) above the ground. BENCH MARK STAMPING: 8610 P 2010 DESIGNATION: 863 8610 P MONUMENTATION: Tidal Station disk VM#: 19651 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.8' N ( 36.94744) LONGITUDE: 76° 19.7' W ( -76.32797) Bench mark is set flush in the concrete base pad of a bus stop shelter located at the southwest corner of fleet supply building located on the southeast corner of the bus shelter, 6.29 m (20.6 ft) southwest from the southwest corner of the fleet supply building, 2.66 m (8.7 ft) east from the southwest corner of bus shelter concrete pad, 0.09 m (0.3 ft) west from the southeast corner of bus shelter concrete pad, 0.18 m (0.6 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8610 R 2010 DESIGNATION: 863 8610 R MONUMENTATION: Tidal Station disk VM#: 19652 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Concrete naval pier OPUS PID: LATITUDE: 36° 56.8' N ( 36.94708) LONGITUDE: 76° 19.6' W ( -76.32692) Bench mark is set flush in the concrete sidewalk of the entrance to the fleet industrial supply center building, 3.17 m (10.4 ft) south of main powered door, 1.19 m (3.9 ft) east from the southwest corner of sidewalk, 0.19 m (0.6 ft) north from the south edge of the sidewalk, 0.10 m (0.3 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) T I D A L D A T U M S Tidal datums at SEWELLS POINT, HAMPTON ROADS 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 (08/23/1933) = 2.444 MEAN HIGHER HIGH WATER MHHW = 0.840 MEAN HIGH WATER MHW = 0.778 North American Vertical Datum NAVD88 = 0.491 MEAN SEA LEVEL MSL = 0.412 MEAN TIDE LEVEL MTL = 0.408 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/31/1966) = -1.092 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8610 G 2006 2.978 2.200 8610 F 2006 2.712 1.934 8610 H 2009 2.984 2.206 8610 J 2009 2.916 2.138 8610 K 2009 2.969 2.191 8610 L 2010 2.539 1.761 8610 M 2010 2.976 2.198 8610 N 2010 2.976 2.198 8610 P 2010 2.975 2.197 8610 R 2010 2.872 2.094
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8638610 PUBLICATION DATE: 08/07/2013 Name: SEWELLS POINT, HAMPTON ROADS VA NOAA Chart: 12245 Latitude: 36° 56.8' N ( 36.94667) USGS Quad: NORFOLK NORTH Longitude: 76° 19.8' W ( -76.33000) 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.