U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) To reach the tidal bench marks from the north end of the US Highway 17 Business Bridge (North Bridge Street) over the Tar River and the intersection with West Main Street, proceed 0.25 km (0.2 mi) ESE on West Main Street to the intersection with West Stewart Parkway, turn right onto West Stewart Parkway and proceed south 0.1 km (0.05 mi). The bench marks are in the vicinity of the Washington Waterfront Marina and along West Main Street and North Market Street. The tide gauge is located next to the dock attendant office at the NW end of the Washington Waterfront Marina. 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 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: Z 25 1932 DESIGNATION: Z 25 MONUMENTATION: Survey disk VM#: 20451 AGENCY: USC&GS IDB PID#: EY0446 SETTING CLASSIFICATION: Building steps OPUS PID: LATITUDE: 35° 32.6' N ( 35.54319) LONGITUDE: 77° 3.2' W ( -77.05414) The primary bench mark is a disk set 0.3 m (1 ft) above the municipal building sidewalk, 14.9 m (49.0 ft) southeast of centerline of Market Street, 9.0 m (29.6 ft) northeast of centerline of West Second Street, 4.9 m (16.2 ft) east of a fire hydrant and 4.7 m (15.3 ft) south-southeast of the flagpole. BENCH MARK STAMPING: 3365 A 2012 DESIGNATION: 865 3365 A MONUMENTATION: Survey disk VM#: 20445 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Seawall OPUS PID: LATITUDE: 35° 32.6' N ( 35.54278) LONGITUDE: 77° 3.5' W ( -77.05889) The bench mark is a disk set in the top of a concrete seawall, 24.25 m (79.6 ft) west of a 0.6 m (2.0 ft) diameter oak tree, 14.16 m (46.5 ft) west-southwest of a flag pole, 8.46 m (27.8 ft) south-southwest of a light post on the seawall, 7.75 m (25.4 ft) northwest of a light post on the seawall, 0.44 m (1.4 ft) east of the outside corner of the seawall and 0.10 m (0.3 ft) east of the metal railing on the seawall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3365 B 2012 DESIGNATION: 865 3365 B MONUMENTATION: Survey disk VM#: 20446 AGENCY: NOS IDB PID#: SETTING CLASSIFICATION: Seawall OPUS PID#: BBCS66 LATITUDE: 35° 32.5' N ( 35.54206) LONGITUDE: 77° 3.5' W ( -77.05783) The bench mark is a disk set in the top of a concrete seawall, 18.38 m (60.3 ft) south-southeast of a light post on the southwest side of West Stewart Parkway, 14.33 m (47.0 ft) west of a light post on the southwest side of West Stewart Parkway, 12.60 m (41.3 ft) southwest of the top back of curb on the southwest side of West Stewart Parkway, 8.11 m (26.6 ft) northwest of a light post on the seawall, 5.93 m (19.5 ft) southeast of a light post on the seawall, 0.48 m (1.6 ft) northwest of a concrete pillar on the seawall, 0.35 m (1.1 ft) northeast of the seaward edge of the seawall and 0.09 m (0.3 ft) northeast of a metal railing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BRIDGE 1965 DESIGNATION: BRIDGE MONUMENTATION: Survey disk VM#: 20447 AGENCY: NC Geodetic Survey IDB PID#: EY1496 SETTING CLASSIFICATION: Concrete bridge OPUS PID: LATITUDE: 35° 32.7' N ( 35.54486) LONGITUDE: 77° 3.7' W ( -77.06094) The bench mark is a standard N.C. brass traverse disk, cemented in the sidewalk flush with the surface of the sidewalk, 30.5 m (100 ft) north of the north end of U.S. 17 Bridge over Pamlico River and in sidewalk in north quadrant of intersection, 20.2 m (66.4 ft) southwest of a power pole with reference tag, 17.3 m (56.7 ft) south of southwest corner of Gulf service station, 14.1 m (46.3 ft) northwest of centerline of highway, 7.6 m (24.9 ft) northeast of centerline main street and 6.2 m (20.4 ft) west of a power pole with reference tag.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HARRIS 1979 DESIGNATION: HARRIS MONUMENTATION: Survey disk VM#: 20448 AGENCY: NC Geodetic Agency IDB PID#: EY4271 SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 35° 32.6' N ( 35.54261) LONGITUDE: 77° 3.4' W ( -77.05639) The bench mark is a standard disk set in drilled hole in concrete sidewalk, 3.3 m (10.8 ft) south-southwest of curb of main street, 3.1 m (10.1 ft) southwest of metal traffic signal post, 2.3 m (7.6 ft) northeast of northwest corner of river town mall building, and 2.0 m (6.7 ft) south-southeast of fire hydrant.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: WASHINGTON 1932 DESIGNATION: WASHINGTON MONUMENTATION: Survey disk VM#: 20449 AGENCY: USC&GS IDB PID#: EY0448 SETTING CLASSIFICATION: Exterior of concrete building OPUS PID: LATITUDE: 35° 32.6' N ( 35.54294) LONGITUDE: 77° 3.4' W ( -77.05703) The bench mark is a disk set vertically in the Bank of America buiding, 12.00 m (39.4 ft) west-northwest of the southeast corner of the building, 4.83 m (15.8 ft) north-northeast of the top back of curb on the north side of West Main Street, 4.81 m (15.8 ft) east of a stop light at the northeast corner of the intersection of North Respess Street and West Main Street, 3.39 m (11.1 ft) east of a light pole, 2.60 m (8.5 ft) west-northwest of the center of the entrance to the building and 1.40 m (4.6 ft) above the ground. BENCH MARK STAMPING: 12 DESIGNATION: 12 MONUMENTATION: Survey disk VM#: 20452 AGENCY: USGS IDB PID#: EY0447 SETTING CLASSIFICATION: Building wall OPUS PID: LATITUDE: 35° 32.6' N ( 35.54319) LONGITUDE: 77° 3.2' W ( -77.05414) The bench mark is a disk 0.3 m (1 ft) above the sidewalk set vertically in the southeast face of the stucco over brick building housing the public library, 37.8 m (124.0 ft) west-southwest of bench mark Z 25, 20.1 m (66.0 ft) south of Second Street, 8.9 m (29.3 ft) west of Market Street, and 0.6 m (2.0 ft) northeast of south corner of building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) T I D A L D A T U M S Tidal datums at WASHINGTON, TAR RIVER, PAMLICO RIVER based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: May 2012 - July 2012 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8652587 OREGON INLET MARINA, PAMLICO SOUND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.321 North American Vertical Datum NAVD88 = 0.285 MEAN HIGH WATER MHW = 0.281 MEAN SEA LEVEL MSL = 0.171 MEAN TIDE LEVEL MTL = 0.166 MEAN LOW WATER MLW = 0.050 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW Z 25 1932 3.322 3.041 3365 A 2012 1.199 0.918 3365 B 2012 1.202 0.921 BRIDGE 1965 3.060 2.779 HARRIS 1979 3.092 2.811 WASHINGTON 1932 4.110 3.829 12 3.375 3.094
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8653365 PUBLICATION DATE: 12/04/2012 Name: WASHINGTON, TAR RIVER, PAMLICO RIVER NC NOAA Chart: 11554 Latitude: 35° 32.7' N ( 35.54500) USGS Quad: WASHINGTON, NC Longitude: 77° 3.7' W ( -77.06170) 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.