U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) To reach the tidal bench marks from the intersection of U.S. Highway 41 and Causeway Boulevard (U.S. Business 41), proceed west on Causeway Boulevard for 1.6 km (1.0 mi) to the access road for Rockport Terminal, then go south on the access road for 1.1 km (0.7 mi) to the Rockport Terminal. The bench marks are located around the terminal between the loading dock and railroad tracks. The tide gauge is located at the south end of the loading dock west of the conveyor building. DCP 3 is located along Causeway BLVD approx. 0.55 km (0.34 miles) west of access road for Rockport Terminal On berth 150 at the SE corner of the seawall. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6667 J 1991 DESIGNATION: 872 6667 J MONUMENTATION: Tidal Station disk VM#: 6825 AGENCY: National Ocean Service (NOS) IDB PID#: DL1851 SETTING CLASSIFICATION: Concrete foundation of loader stop OPUS PID: LATITUDE: 27° 54.8' N ( 27.91344) LONGITUDE: 82° 25.4' W ( -82.42414) The primary bench mark is a disk set in the SW corner of the concrete foundation of a stop for the bulk loader that travels on rails along the waterfront, 18.41 m (60.40 ft) NE of the NE corner of the concrete walkway leading to the dock, 3.72 m (12.20 ft) WNW of the west rail of the bulk loader, and 0.91 m (2.99 ft) WSW of the SW corner of the stop.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6667 C 1976 DESIGNATION: 872 6667 C TIDAL MONUMENTATION: Tidal Station disk VM#: 6820 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7506 SETTING CLASSIFICATION: sidewalk OPUS PID: LATITUDE: 27° 54.9' N ( 27.91531) LONGITUDE: 82° 25.3' W ( -82.42233) The bench mark is a disk set on the concrete porch located along the SE wall of the Seaboard Coastline Railroad terminal office, SE of the boat mooring area, 75.3 m (247.0 ft) west of bench mark 6667 E 1976, 7.99 m (26.21 ft) SW of the east corner of the building, and 0.85 m (2.79 ft) SE of the SE wall of the building. BENCH MARK STAMPING: 6667 F 1976 DESIGNATION: 872 6667 F TIDAL MONUMENTATION: Tidal Station disk VM#: 6822 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7504 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AG7504 LATITUDE: 27° 55.0' N ( 27.91661) LONGITUDE: 82° 25.2' W ( -82.42022) The bench mark is a disk located on the north side of the access road near the Guard Shack and the entrance gate, 29.40 m (96.45 ft) WSW of the NS fence line, 6.15 m (20.17 ft) NNW of a chainlink fence 0.38 m (1.24 ft) west of power pole number 9 with a light, the last pole on the NE end of the property, and 0.3 m (0.98 ft) above road level. The bench mark is crimped to a copper-coated steel rod driven 12.2 m (40.0 ft) to refusal, and encased in a PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6667 G 1990 DESIGNATION: 872 6667 G MONUMENTATION: Tidal Station disk VM#: 6823 AGENCY: National Ocean Service (NOS) IDB PID#: DL1807 SETTING CLASSIFICATION: Mooring bollard base OPUS PID#: DL1807 LATITUDE: 27° 55.0' N ( 27.91711) LONGITUDE: 82° 25.3' W ( -82.42178) The bench mark is a disk set in the SW corner of the concrete base of a mooring bollard located near the NE end of the loading dock, 28.29 m (92.81 ft) NW of the NW corner of the restroom building, 23.9 m (78.4 ft) NW of power pole #2636940260, 2.80 m (9.19 ft) north of the centerline of the concrete ramp leading to the dock, 1.98 m (6.50 ft) west of the top edge of the riprap sea wall, and 0.18 m (0.59 ft) above ground. BENCH MARK STAMPING: 6667 H 1990 DESIGNATION: 872 6667 H MONUMENTATION: Tidal Station disk VM#: 6824 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 27° 55.0' N ( 27.91708) LONGITUDE: 82° 25.2' W ( -82.41931) The bench mark is a disk set in the SE corner of the concrete foundation of a steel arm structure located at the railroad unloading building,13.5 m (44.4 ft) west of the centerline of the access road, 7.8 m (25.5 ft) east of power pole #644540245, 6.68 m (21.90 ft) NE of the NE corner of the railroad unloading buidling, and 0.15 m (0.49 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6667 B 1976 DESIGNATION: 872 6667 B TIDAL MONUMENTATION: Tidal Station disk VM#: 20521 AGENCY: Florida Department of Natural ResourcesIDB PID#: AG7505 SETTING CLASSIFICATION: Railroad bell base OPUS PID: LATITUDE: 27° 54.9' N ( 27.91539) LONGITUDE: 82° 25.3' W ( -82.42225) The bench mark is a disk set in the concrete foundation for a brass bell located on the property of the Seaboard Coastline Railroad, 34.44 m (113 ft) SE of telephone pole #26343 40217 on NW side of the access road, 13.41 m (44 ft) NW of centerline of Sagasta St running in front of the terminal office, 7.01 m (23 ft) east of eastern corner of the terminal office buiding. BENCH MARK STAMPING: 8726667 K 2019 DESIGNATION: 872 6667 K MONUMENTATION: Bench Mark disk VM#: 23099 AGENCY: National Ocean Service IDB PID: SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBGP17 LATITUDE: 27° 55.4' N ( 27.92322) LONGITUDE: 82° 25.3' W ( -82.42128) The bench mark is a nos brass disk set in the seawall, 12.8 m (42.0 ft) south of the edge of perimeter fence. 7.6 m (24.9 ft) north of the mwwl stand and 46 cm (18 inches) west of the seawall edge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8726667 L 2019 DESIGNATION: 872 6667 L MONUMENTATION: Flange-encased Rod VM#: 23100 AGENCY: National Ocean Service IDB PID: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 27° 55.5' N ( 27.92436) LONGITUDE: 82° 25.2' W ( -82.42011) The bench mark is a flange-encased rod set 2.8 m (9.2 ft)east-northeast of power pole # 26424-40527. 1.1 m (3.6 ft)south of edge of concrete of highway. 0.7 m (2.3 ft)south to centerline of sidewalk. The datum point is a top of a stainless steel rod driven 14 m (45.9 ft) to refusal and encased in a 6 inch (15 cm) well and aluminum cap set in a concrete kickplate. BENCH MARK STAMPING: 8726667 M 2019 DESIGNATION: 872 6667 M MONUMENTATION: Bench Mark disk VM#: 23101 AGENCY: National Ocean Service IDB PID: SETTING CLASSIFICATION: Power pole base OPUS PID: LATITUDE: 27° 55.4' N ( 27.92372) LONGITUDE: 82° 25.2' W ( -82.41922) The bench mark is a brass disk set in the south side base of a power pole, 53 m (173.9 ft) west-northwest of power pole next to telephone pole #453827. 25 m (82.0 ft) east-southeast of power pole unmarked. 2.3 m (7.5 ft) sourh of centerline of sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8726667 N 2019 DESIGNATION: 872 6667 N MONUMENTATION: Bench Mark disk VM#: 23102 AGENCY: National Ocean Service IDB PID: SETTING CLASSIFICATION: Light pole base OPUS PID: LATITUDE: 27° 55.4' N ( 27.92317) LONGITUDE: 82° 25.1' W ( -82.41800) The bench mark is a brass disk set in base of light pole, 48.5 m (159.1 ft) west-northwest of power pole 014615. 19.4 m (63.6 ft) south of centerline of highway. 1.2 m (3.9 ft) north of center of sidewalk. BENCH MARK STAMPING: 8726667 P 2019 DESIGNATION: 872 6667 P MONUMENTATION: Bench Mark disk VM#: 23103 AGENCY: National Ocean Service IDB PID: SETTING CLASSIFICATION: Light pole base OPUS PID: LATITUDE: 27° 55.4' N ( 27.92300) LONGITUDE: 82° 25.0' W ( -82.41714) The bench mark is a brass disk set in the base of a light pole, 52 m (170.6 ft) west of power pole 019844. 43.4 m (142.4 ft) ENE of power pole 014615. 19.4 m (63.6 ft) south of centerline of highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) T I D A L D A T U M S Tidal datums at CSX ROCKPORT, MCKAY BAY ENTRANCE based on: LENGTH OF SERIES: 14 YEARS TIME PERIOD: 1/1999 - 12/2007 & 1/2015 - 12/2019 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8726520 ST. PETERSBURG, TAMPA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/08/1996) = 2.128 MEAN HIGHER HIGH WATER MHHW = 0.817 MEAN HIGH WATER MHW = 0.717 North American Vertical Datum NAVD88 = 0.514 MEAN SEA LEVEL MSL = 0.443 MEAN TIDE LEVEL MTL = 0.434 MEAN LOW WATER MLW = 0.152 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (09/11/2017) = -1.417 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6667 J 1991 3.037 2.320 6667 C 1976 3.102 2.385 6667 F 1976 3.200 2.483 6667 G 1990 2.846 2.129 6667 H 1990 3.369 2.652 6667 B 1976 3.100 2.383 8726667 K 2019 3.371 2.654 8726667 L 2019 3.066 2.349 8726667 M 2019 3.953 3.236 8726667 N 2019 2.887 2.170 8726667 P 2019 2.703 1.986
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) Foot Notes: Bench marks K, L, M, N, and P are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 8726667 PUBLICATION DATE: 12/17/2020 Name: CSX ROCKPORT, MCKAY BAY ENTRANCE FL NOAA Chart: 11412 Latitude: 27° 54.8' N ( 27.91333) USGS Quad: TAMPA Longitude: 82° 25.5' W ( -82.42500) 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.