U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) To reach the bench marks from the intersection of Interstate Highway 264 and Effingham Street (Route 141), proceed south 1.4 km (0.9 mi) to the Naval Shipyard entrance. At the pass office at the gate entrance, call 8273 for an escort. You must have an escort for the entrance to the CIA area. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: DESIGNATION: F 9 USN ALIAS: 5-F9 MONUMENTATION: Chiseled Square VM#: 10838 AGENCY: Department of Defense (DOD) IDB PID#: FX0171 SETTING CLASSIFICATION: Dry Dock OPUS PID: LATITUDE: 36° 49.2' N ( 36.82000) LONGITUDE: 76° 17.6' W ( -76.29330) The primary bench mark is a chiseled square on the center of the rounded nose of a granite coping at the SW corner of Dry Dock No. 1, 43 m (141 ft) east of the south end of building No. 64, 4.66 m (15.3 ft) north of the north side of the south granite wall of the dock, 3.4 m (11 ft) east of the west end of the dock, and 1.8 m (6 ft) north of the north edge of the steps at the corner of the dock. Note: known as Navy Yard Basic Bench Mark (Historically designated as 5-F9 1913)
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 1 1970 DESIGNATION: TIDAL 1 STA 94 MONUMENTATION: Tidal Station disk VM#: 10839 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FX0173 SETTING CLASSIFICATION: Concrete loading ramp OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.5' W ( -76.29170) The bench mark is a disk set on top of the concrete along the south side of a concrete loading ramp, 0.16 km (0.1 mi) east of building No. 73, 31.76 m (104.2 ft) west of the west side of the concrete seawall of the river, 15.2 m (50 ft) west of the SW corner of the gage house building No. 227, 6.10 m (20.0 ft) south of the south side of Wet Slip No. 2, and 0.21 m (0.7 ft) north of the south edge of the concrete, and about level with the parking area. BENCH MARK STAMPING: NO 2 1973 DESIGNATION: 863 8660 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 10840 AGENCY: National Ocean Survey (NOS) IDB PID#: FX2219 SETTING CLASSIFICATION: granite footing OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.5' W ( -76.29170) The bench mark is a disk set in a granite footing at the east entrance to building No. 62 (the Naval Ordanance System Support Office at the U.S. Naval Shipyard in Portsmouth), 18 m (59 ft) north of the centerline of Chariolton Street, 14.6 m (48 ft) south of the centerline of Hughes Street, 2.4 m (8 ft) west of the west curb, and 0.30 m (1 ft) above sidewalk level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 10 1938 DESIGNATION: 863 8660 TIDAL 10 MONUMENTATION: Tidal Station disk VM#: 10841 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FX0172 SETTING CLASSIFICATION: Building OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set vertically into the east face of Sloat Hall (Building No. 73) along the north side of Berrien Street, 11.43 m (37.5 ft) north of the north curb of Berrien Street, 3.14 m (10.3 ft) west of the west curb of Bell Avenue, 0.52 m (1.7 ft) north of the SE corner of Sloat Hall, and 1.16 m (3.8 ft) above ground. BENCH MARK STAMPING: 11 1945 DESIGNATION: 863 8660 TIDAL 11 MONUMENTATION: Tidal Station disk VM#: 10842 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FX0162 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 36° 48.7' N ( 36.81170) LONGITUDE: 76° 18.0' W ( -76.30000) The bench mark is a disk set in the top of the concrete sidewalk at the NW corner of Dry Dock No. 8, 36.42 m (119.5 ft) south of the SW corner of building No. 269, 0.85 m (2.8 ft) south of the south rail of a track for a crane, and 0.46 m (1.5 ft) from the outside corner of the coping at the edge of the dock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 863-8660 A 1975 DESIGNATION: 863 8660 A MONUMENTATION: Tidal Station disk VM#: 10843 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete porch OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the top of a concrete porch on the south side of building No. 22, 18.56 m (61.0 ft) north of the NE corner of building No. 300, 13.4 m (44 ft) east from the SW corner of building No. 22, and 0.40 m (1.3 ft) above the sidewalk. BENCH MARK STAMPING: 863-8660 B 1975 DESIGNATION: 863 8660 B MONUMENTATION: Tidal Station disk VM#: 10844 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete coping OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the concrete coping of Dry Dock No. 4, 26.40 m (86.6 ft) from the staff on the head of the NW stairway, and 0.52 m (1.7 ft) west of the top step.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 863-8660 C 1975 DESIGNATION: 863 8660 C MONUMENTATION: Tidal Station disk VM#: 10845 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Roof Support Foundation OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the concrete base of the west metal column supporting the roof of building No. 261, 32.25 m (105.8 ft) SE of the east corner of building No. 163, 24.63 m (80.8 ft) NE of the north corner of building No. 235, and 0.37 m (1.2 ft) NW of the west column. BENCH MARK STAMPING: 863-8660 D 1975 DESIGNATION: 863 8660 D MONUMENTATION: Tidal Station disk VM#: 10846 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete loading platform OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the top of a concrete loading platform at the NW end of building No. 275, 9.45 m (31 ft) from the west corner of building No. 275, and 5.76 m (18.9 ft) SW of the north corner of building No. 275.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 863-8660 E 1975 DESIGNATION: 863 8660 E MONUMENTATION: Tidal Station disk VM#: 10847 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the top center of the concrete bulkhead of wet slip no. 4, 50.44 m (165.5 ft) west from the NE corner of wet slip No. 4, 6.43 m (21.1 ft) south of the SW corner of building No. 830, and 4.88 m (16.0 ft) east of the SW corner of a block-house for a concrete drain. BENCH MARK STAMPING: 863-8660 F 1975 DESIGNATION: 863 8660 F MONUMENTATION: Tidal Station disk VM#: 10848 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 36° 49.3' N ( 36.82170) LONGITUDE: 76° 17.6' W ( -76.29330) The bench mark is a disk set in the top of the concrete bulkhead next to the second most southerly cleat of wet slip No. 5, 22.74 m (74.6 ft) north of the SW corner of wet slip No. 5, 13.78 m (45.2 ft) east of the center of the road, and 0.34 m (1.1 ft) west of the seaward side of the bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: M 452 1971 DESIGNATION: M 452 MONUMENTATION: Bench Mark disk VM#: 10849 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FX0170 SETTING CLASSIFICATION: Concrete guardrail OPUS PID: LATITUDE: 36° 49.2' N ( 36.82000) LONGITUDE: 76° 17.7' W ( -76.29500) The bench mark is a disk set on the top of a concrete guard rail on the west side of the entrace to the most westerly steps on the north side of Dry Dock No. 3, 39 m (128 ft) NE of the center of the west end of the dry dock, 32.3 m (106 ft) south of the SW corner of building No. 300, and 0.91 m (3 ft) above blacktop level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) T I D A L D A T U M S Tidal datums at PORTSMOUTH,NORFOLK NAVAL SHIPYRD based on: LENGTH OF SERIES: 8 YEARS TIME PERIOD: January 1979 - December 1986 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: HIGHEST OBSERVED WATER LEVEL (09/18/1936) = 2.449 MEAN HIGHER HIGH WATER MHHW = 0.946 MEAN HIGH WATER MHW = 0.882 North American Vertical Datum NAVD88 = 0.546 MEAN SEA LEVEL MSL = 0.464 MEAN TIDE LEVEL MTL = 0.462 MEAN LOW WATER MLW = 0.042 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/31/1966) = -1.087 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW F 9 USN 2.044 1.162 NO 1 1970 2.236 1.354 NO 2 1973 2.625 1.743 10 1938 3.829 2.947 11 1945 2.935 2.053 863-8660 A 1975 3.024 2.142 863-8660 B 1975 2.436 1.554 863-8660 C 1975 2.969 2.087 863-8660 D 1975 3.661 2.779 863-8660 E 1975 2.489 1.607 863-8660 F 1975 2.986 2.104 M 452 1971 3.049 2.167
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 10 Station ID: 8638660 PUBLICATION DATE: 05/02/2003 Name: PORTSMOUTH,NORFOLK NAVAL SHIPYRD VA NOAA Chart: 12221 Latitude: 36° 49.3' N ( 36.82170) USGS Quad: NORFOLK NORTH Longitude: 76° 17.6' W ( -76.29330) 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.