U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8517137 PUBLICATION DATE: 01/13/2016 Name: BEACH CHANNEL CROSS B. BRIDGE NY NOAA Chart: 12350 Latitude: 40° 35.3' N ( 40.58830) USGS Quad: FAR ROCKAWAY Longitude: 73° 49.2' W ( -73.82000) To reach the station from JFK airport in Queens, NY, follow Belt Parkway 4.7 km (2.9 mi) west to exit 17S for Cross Bay Boulevard, proceed south on Cross Bay Boulevard 8.8 km (5.5 mi) through the toll plaza and to the end of the Cross Bay Bridge, stay left to take the exit for Far Rockaway and continue to stay left 0.4 km (0.25 mi) south and then west around the exit ramp to merge onto Beach Channel Drive, immediately turn left and proceed north on Beach 92nd Street 0.05 km (0.03 mi) to Thai Rock Restaurant and the tide station in the outside eating area. The bench marks are along the seawall west of the restaurant. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7137 B 2015 DESIGNATION: 851 7137 B MONUMENTATION: DB VM#: 21383 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Abutments and piers of large bridges OPUS PID: LATITUDE: 40° 35.3' N ( 40.58822) LONGITUDE: 73° 49.1' W ( -73.81853) The primary bench mark is a disk set in the NW corner of the bridge abutment, 14.06 m (46.1 ft) SW of pathway light pole p6, 13.34 m (43.8 ft) W of street light pole c84 for bridge traffic, 11.46 m (37.6 ft) E of NW fence corner under bridge, 8.67 m (28.4 ft) SE of pathway light pole p7, 1.65 m (5.4 ft) N of NE fence corner under bridge and about 1.4 m (4.6 ft) higher than the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8517137 PUBLICATION DATE: 01/13/2016 Name: BEACH CHANNEL CROSS B. BRIDGE NY NOAA Chart: 12350 Latitude: 40° 35.3' N ( 40.58830) USGS Quad: FAR ROCKAWAY Longitude: 73° 49.2' W ( -73.82000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7137 A 2015 DESIGNATION: 851 7137 A MONUMENTATION: DB VM#: 21384 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Retaining walls OPUS PID: LATITUDE: 40° 35.3' N ( 40.58875) LONGITUDE: 73° 49.0' W ( -73.81725) The bench mark is a disk set in the top of E end of the N wall for the pedestrian path up to the bridge, 17.66 m (57.9 ft) SW of power pole near Mcdonalds restaurant drive thru, 17.09 m (56.1 ft) SE of E most pathway light pole in park S of seawall, 16.68 m (54.7 ft) S of fire hydrant on W side of dead end Beach 92nd street, 15.79 m (51.8 ft) NNE of E facing sign for cross bay Vet Mem Bridge Belt Parkway, 9.37 m (30.7 ft) NW of stop sign at NW corner of Beach 92nd street and Beach Channel drive intersection and about 0.76 m (2.5 ft) higher than the ground. BENCH MARK STAMPING: 7137 C 2015 DESIGNATION: 851 7137 C MONUMENTATION: DB VM#: 21385 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID: LATITUDE: 40° 35.3' N ( 40.58769) LONGITUDE: 73° 49.2' W ( -73.81969) The bench mark is a disk set in the top of the concrete seawall, 25.16 m (82.5 ft) NE of light pole p16, 18.79 m (61.6 ft) N of NW end of a fence at bridge abutment, 10.35 m (34.0 ft) NNE of light pole p15, 9.50 m (31.2 ft) W of first pathway light pole p14 W of bridge off ramp and 6.32 m (20.7 ft) WSW of sign on seawall railing for discharge outfall point rk-011.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8517137 PUBLICATION DATE: 01/13/2016 Name: BEACH CHANNEL CROSS B. BRIDGE NY NOAA Chart: 12350 Latitude: 40° 35.3' N ( 40.58830) USGS Quad: FAR ROCKAWAY Longitude: 73° 49.2' W ( -73.82000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7137 D 2015 DESIGNATION: 851 7137 D MONUMENTATION: DB VM#: 21386 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID#: BBDV24 LATITUDE: 40° 35.2' N ( 40.58722) LONGITUDE: 73° 49.2' W ( -73.82061) The bench mark is a disk set in the top of the concrete seawall, 27.83 m (91.3 ft) WSW of sign on seawall railing warning of outfall during dry weather, 17.37 m (57.0 ft) W of light pole p19, 15.12 m (49.6 ft) NE of light pole p21 and 5.83 m (19.1 ft) N of light pole p20. BENCH MARK STAMPING: 7137 E 2015 DESIGNATION: 851 7137 E MONUMENTATION: DB VM#: 21387 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Retaining walls OPUS PID: LATITUDE: 40° 35.2' N ( 40.58681) LONGITUDE: 73° 49.3' W ( -73.82147) The bench mark is a disk set in the top of the SE end of the concrete wall inland of the riprap shore around beach channel high school, 24.39 m (80.0 ft) NW of light pole on N side of Beach Channel drive near end of W bound bridge exit lane, 18.22 m (59.8 ft) NNW of the SE corner of school fence at sidewalk along Beach Channel drive, 10.83 m (35.5 ft) W of police your pets sign, 0.45 m (1.5 ft) S of W end of stainless steel seawall railing and about 0.6 m (2.0 ft) higher than the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8517137 PUBLICATION DATE: 01/13/2016 Name: BEACH CHANNEL CROSS B. BRIDGE NY NOAA Chart: 12350 Latitude: 40° 35.3' N ( 40.58830) USGS Quad: FAR ROCKAWAY Longitude: 73° 49.2' W ( -73.82000) T I D A L D A T U M S Tidal datums at BEACH CHANNEL CROSS B. BRIDGE based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: April 2015 - August 2015 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8531680 SANDY HOOK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.831 MEAN HIGH WATER MHW = 1.723 MEAN TIDE LEVEL MTL = 0.894 MEAN SEA LEVEL MSL = 0.892 MEAN LOW WATER MLW = 0.066 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7137 B 2015 4.602 2.879 7137 A 2015 4.095 2.372 7137 C 2015 3.310 1.587 7137 D 2015 3.321 1.598 7137 E 2015 3.944 2.221
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8517137 PUBLICATION DATE: 01/13/2016 Name: BEACH CHANNEL CROSS B. BRIDGE NY NOAA Chart: 12350 Latitude: 40° 35.3' N ( 40.58830) USGS Quad: FAR ROCKAWAY Longitude: 73° 49.2' W ( -73.82000) 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.