U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8535375 PUBLICATION DATE: 07/31/2014 Name: TOWNSEND INLET NJ NOAA Chart: 12316 Latitude: 39° 7.3' N ( 39.12170) USGS Quad: SEA ISLE CITY Longitude: 74° 43.0' W ( -74.71670) To reach the tidal bench marks from the intersection of U.S. Highway 9 and Sea Isle Boulevard in Ocean View, proceed SE on Sea Isle Boulevard for 4.5 km (2.8 mi) to the intersection with Landis Avenue, turn right and proceed SW on Landis Avenue for 3.8 km (2.3 mi) to the intersection with 86th Street, turn right and then head NW on 86th Street for 170 m (557 ft) to its termination at Sunset Pier Restaurant and Marina. The bench marks are located along Landis Avenue from the United States Coast Guard Station to the Townsends Inlet Toll Bridge. The tide gauges and staff are located on the western side of Sunset Pier Restaurant and Marina property at the NW end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5375 E 1977 DESIGNATION: 853 5375 E MONUMENTATION: Tidal Station disk VM#: 20839 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete Bridge Support Footing OPUS PID: LATITUDE: 39° 7.2' N ( 39.11994) LONGITUDE: 74° 42.9' W ( -74.71544) The primary bench mark is a disk set in top of a 8-foot diameter concrete footing supporting the east of two bridge columns third from the water line, on the northern side of Townsends Inlet and under the bridge, 11.23 m (36.8 ft) SSE of the SW corner of the west concrete piling in the southernmost set of three columns supporting a cap beam, 9.47 m (31.1 ft) SSW of the SE corner of the east concrete piling in the southernmost set three columns supporting a cap beam, 6.09 m (20.0 ft) ESE of the NW corner of the west column of the third bridge support from water, 0.26 m (0.9 ft) north of the north face of the east concrete column third from the water line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8535375 PUBLICATION DATE: 07/31/2014 Name: TOWNSEND INLET NJ NOAA Chart: 12316 Latitude: 39° 7.3' N ( 39.12170) USGS Quad: SEA ISLE CITY Longitude: 74° 43.0' W ( -74.71670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TOWNSEND 1932 DESIGNATION: TOWNSEND MONUMENTATION: Triangulation Station disk VM#: 20840 AGENCY: US Coast & Geodetic Survey IDB PID#: JU2926 SETTING CLASSIFICATION: Concrete Post OPUS PID#: JU2926 LATITUDE: 39° 7.7' N ( 39.12819) LONGITUDE: 74° 42.6' W ( -74.70928) The bench mark is a disk set in top of a 12-inch concrete monument in the lawn of the United States Coast Guard (USCG) recreation facility at 8101 Landis Avenue, 28.11 m (92.2 ft) west of the centerline of Pleasure Avenue, 27.06 m (88.8 ft) ESE of the NE corner of a brick USCG outbuilding, 27.00 m (88.5 ft) SSE of the USCG flag pole, 23.72 m (77.8 ft) SSW of the SE corner of the main structure on the USCG property, 16.23 m (53.2 ft) ESE of reference mark TOWNSEND 5, and 1.42 m (4.6 ft) WNW of the edge of the parking lot pavement. BENCH MARK STAMPING: 5375 B 1977 DESIGNATION: 853 5375 B MONUMENTATION: Tidal Station disk VM#: 20841 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: 5/8-inch Galvanized Steel Rod OPUS PID: LATITUDE: 39° 7.3' N ( 39.12217) LONGITUDE: 74° 42.9' W ( -74.71472) The bench mark is a disk located in the SW corner of the gravel yard of 9205 Landis Avenue, 11.10 m (36.4 ft) ESE of the centerline of Landis Avenue, 10.55 m (34.6 ft) NNE of the centerline of 93rd Street, 8.95 m (29.4 ft) west of the SW corner of 9205 Landis Avenue, and 4.16 m (13.6 ft) east of a utility pole numbered 557 at the corner of 93rd Street and Landis Avenue. The bench mark is crimped to a galvanized steel drive rod driven 15.2 m (50 ft), and encased in a 4-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8535375 PUBLICATION DATE: 07/31/2014 Name: TOWNSEND INLET NJ NOAA Chart: 12316 Latitude: 39° 7.3' N ( 39.12170) USGS Quad: SEA ISLE CITY Longitude: 74° 43.0' W ( -74.71670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5375 C 1977 DESIGNATION: 853 5375 C MONUMENTATION: Tidal Station disk VM#: 20842 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete Bridge Abutment OPUS PID: LATITUDE: 39° 7.3' N ( 39.12125) LONGITUDE: 74° 42.9' W ( -74.71528) The bench mark is a disk set in top of a concrete bridge abutment just north of an expansion joint on the west side of the northern end of the bridge over Townsends Inlet, 15.56 m (51.0 ft) SW of the concrete post at the end of the railing on the east side of bridge, 14.66 m (48.1 ft) SSW of a metal Bridge Has Steel Grid Deck sign, 3.44 m (11.2 ft) WNW of the centerline of Ocean Drive, 1.27 m (4.2 ft) south of a utility pole numbered BT31S1, 0.35 m (1.1 ft) WNW of the curb edge of Ocean Drive, and 0.25 m (0.8 ft) above road level. BENCH MARK STAMPING: 5375 D 1977 DESIGNATION: 853 5375 D MONUMENTATION: Tidal Station disk VM#: 20843 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: 5/8-inch Galvanized Steel Rod OPUS PID: LATITUDE: 39° 7.2' N ( 39.12069) LONGITUDE: 74° 42.9' W ( -74.71528) The bench mark is a disk located in the sand on the east side of the northern end of the bridge over Townsends Inlet, 82.50 m (270.7 ft) NNE of bench mark 853 5375 E, 15.20 m (49.9 ft) south of a utility pole numbered W32729, 6.11 m (20.0 ft) NE of the NE corner of fifth concrete cap beam south of the northern bridge abutment, 3.91 m (12.8 ft) SE of the SE corner of fourth concrete cap beam south from the northern bridge abutment. The bench mark is set 0.69 m (2.3 ft) below grade and 3.46 m (11.4 ft) below the level of the bridge, crimped to a 5/8-inch galvanized steel drive rod driven 15.2 m (50 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8535375 PUBLICATION DATE: 07/31/2014 Name: TOWNSEND INLET NJ NOAA Chart: 12316 Latitude: 39° 7.3' N ( 39.12170) USGS Quad: SEA ISLE CITY Longitude: 74° 43.0' W ( -74.71670) T I D A L D A T U M S Tidal datums at TOWNSEND INLET based on: LENGTH OF SERIES: 9 MONTHS TIME PERIOD: August 2013 - April 2014 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8534720 ATLANTIC CITY, ATLANTIC OCEAN Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.380 MEAN HIGH WATER MHW = 1.261 MEAN SEA LEVEL MSL = 0.671 MEAN TIDE LEVEL MTL = 0.658 MEAN LOW WATER MLW = 0.055 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5375 E 1977 1.632 0.371 TOWNSEND 1932 3.017 1.756 5375 B 1977 2.821 1.560 5375 C 1977 4.042 2.781 5375 D 1977 2.354 1.093
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8535375 PUBLICATION DATE: 07/31/2014 Name: TOWNSEND INLET NJ NOAA Chart: 12316 Latitude: 39° 7.3' N ( 39.12170) USGS Quad: SEA ISLE CITY Longitude: 74° 43.0' W ( -74.71670) 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.