U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: BM E.D.M. 15 MSL 1942 DESIGNATION: EDM 15 MONUMENTATION: Tidal Station disk VM#: 13976 AGENCY: National Ocean Service (NOS) IDB PID#: BC0458 SETTING CLASSIFICATION: Step OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The primary bench mark is a disk set near the SW end of the bottom step at the SE entrance to a house at the Ferry Maintenance Facility at 4610 Ocean Street, 57.30 m (187.99 ft) SE of the SE corner of the Ferry Maintenance Office, 23.29 m (76.41 ft) SW of the center of an entrance road and gate, and 14 m (46 ft) NW of the center of Ocean Street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM E.D.M. 14 M.S.L. 1942 DESIGNATION: EDM 14 MONUMENTATION: Survey disk VM#: 13978 AGENCY: National Ocean Service (NOS) IDB PID#: BC0467 SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The bench mark is a disk set in the top of a concrete block near a garage at the Ferry Maintenance Facility at 4610 Ocean Street, 20.79 m (68.2 ft) SW of the SE corner of the office building, 17.80 m (58.4 ft) WSW of a flag pole, 3.20 m (10.5 ft) NNW of the NW corner of a garage, 0.50 m (1.6 ft) NE of a witness post, and 0.09 m (0.30 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: B 407 1991 DESIGNATION: B 407 MONUMENTATION: Metal Rod VM#: 13979 AGENCY: National Ocean Service (NOS) IDB PID#: BC2546 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The bench mark is a metal rod located at the Ferry Maintenance Depot at 4610 Ocean Street, on the SW side of the property, next to a chain link fence, 38.89 m (127.6 ft) SW of the SW corner of the Ferry Maintenance Office, 22.59 m (74.1 ft) NW of a chain-link fence, 18.20 m (59.7 ft) SE of the SE face of a retaining wall, 9.51 m (31.2 ft) SW of the west corner of a garage, and 0.91 m (3.0 ft) NE of a chain-link fence. The datum point is the top of a stainless steel rod driven 20.39 m (66.9 ft) to refusal, and encased in a 5-inch NGS logo cap. BENCH MARK STAMPING: 0220 B 1978 DESIGNATION: 872 0220 B TIDAL MONUMENTATION: Tidal Station disk VM#: 13980 AGENCY: National Ocean Service (NOS) IDB PID#: BC2545 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The bench mark is a disk encased in a 4-inch PVC pipe that is flush with the ground surface, located in Mayport at 4610 Ocean Street, 20.51 m (67.3 ft) ENE of a flag pole, 16.18 m (53.1 ft) SE of the NE corner of the Ferry Maintenance Office at 4610 Ocean Street, 9.39 m (30.8 ft) SW of a chain-link fence, and 0.70 m (2.3 ft) NW of the NW corner of a porch along the west side of a warehouse.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0220 A 1978 DESIGNATION: 872 0220 A TIDAL MONUMENTATION: Vertical Control disk VM#: 13982 AGENCY: National Ocean Service (NOS) IDB PID#: BC2486 SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The bench mark is a disk located on the Ferry Maintenance Facility grounds, 13.32 m (43.7 ft) south of the south corner of an office, 13.11 m (43.0 ft) west of the west corner of the warehouse, and 2.68 m (8.8 ft) SE of a flagpole. The bench mark is crimped to an unspecified steel rod driven to refusal, encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: EDM 13 1942 DESIGNATION: EDM 13 MONUMENTATION: Survey disk VM#: 13983 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Set into the top of a metal pipe driven into the ground OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 81° 25.9' W ( -81.43170) The bench mark is a disk set atop a pipe on the west side of the warehouse at the Ferry Maintenance Facility, 5.33 m (17.49 ft) SW of the NW corner of the warehouse, 1.37 m (4.49 ft) west of its west wall, 0.46 m (1.51 ft) WSW of bench mark Mayport 2 RM NO 1 1946, and 0.15 m (0.49 ft) south of a concrete slab inside a wooden fenced area used for garbage can storage.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) T I D A L D A T U M S Tidal datums at MAYPORT (FERRY DEPOT), ST JOHNS RIVER based on: LENGTH OF SERIES: 11 MONTHS TIME PERIOD: April 1997 - February 1998 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720220 MAYPORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.513 MEAN HIGH WATER MHW = 1.430 North American Vertical Datum NAVD88 = 0.939 MEAN SEA LEVEL MSL = 0.752 MEAN TIDE LEVEL MTL = 0.737 MEAN LOW WATER MLW = 0.045 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW BM E.D.M. 15 MSL 1942 2.679 1.249 BM E.D.M. 14 M.S.L. 1942 1.984 0.554 B 407 1991 1.980 0.550 0220 B 1978 2.101 0.671 0220 A 1978 2.205 0.775 EDM 13 1942 2.121 0.691
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8720224 PUBLICATION DATE: 05/16/2005 Name: MAYPORT (FERRY DEPOT), ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 23.7' N ( 30.39500) USGS Quad: MAYPORT Longitude: 81° 25.9' W ( -81.43170) 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.