U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) To reach the tidal bench marks from the overpass of Atlantic Boulevard (State Road 10) over Mayport Road (State Road A1A), proceed north along Mayport Road (SR A1A) for 3.6 km (2.3 mi) to a fork in the road, State Road A1A bears left (NW) while continuing straight ahead (North) on the same street (now called State Road 101, Main Street) for 2.9 km (1.8 mi) to the main gate of the navy base. A pass is required for admittance to the base, this may be obtained from an office just south of the main gate and east of Main Street. After passing through the gate, go north on Main Street for 2.1 km (1.3 mi) to the hazardous waste storage area. The tide gage is installed on the north end of the waste water treatment dock, located about 100.6 m (330.0 ft) north of the NW corner of Building Number 1241, about 48.2 m (158.0 ft) north of the south end of the waste water treatment dock and 43.3 m (141.9 ft) north of bench mark 0211 C 1995. Note: This is a temporary Aqua Trak (tide gage) which is subject to being removed. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0211 A 1995 DESIGNATION: 872 0211 A TIDAL MONUMENTATION: Flange-encased Rod VM#: 13465 AGENCY: National Ocean Service (NOS) IDB PID#: DI9219 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DI9219 LATITUDE: 30° 24.0' N ( 30.39944) LONGITUDE: 81° 24.8' W ( -81.41278) The primary bench mark is a flange-encased rod located 69.5 m (228.0 ft) NE of 0211 A 1995, 30.1 m (98.8 ft) SE of a 61.0 cm (24.0 in) palm tree, 18.4 m (60.5 ft) NE of the NE edge of the parking lot and 0.6 m (1.9 ft) west of the NW corner of a 1.8 m (6.0 ft) tall chainlink fence line. The datum point is recessed 0.1 m (0.3 ft) below the level of the NOS logo cap, being the top of a stainless steel rod, driven to refusal at a depth of 24.3 m (79.8 ft), and encased in a 5-inch NGS logo cap flush with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0211 B 1995 DESIGNATION: 872 0211 B MONUMENTATION: Flange-encased Rod VM#: 13466 AGENCY: National Ocean Service (NOS) IDB PID#: DL5745 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DL5745 LATITUDE: 30° 24.0' N ( 30.39972) LONGITUDE: 81° 24.9' W ( -81.41500) The bench mark is a flange-encased rod located 51.4 m (168.5 ft) NE of the approximate center of a paved road, 45.5 m (149.3 ft) NE of the SW end of a chainlink fence line, 41.0 m (134.6 ft) SSE of a palm tree, 7.1 m (23.3 ft) SW of the NE end of a chainlink fence line and 0.3 m (1.0 ft) SE of a NE-SW chainlink fence line and a carsonite witness post. The datum point is recessed 0.1 m (0.3 ft) below the level of the NOS logo cap, being the top of a stainless steel rod, driven to refusal at a depth of 21.8 m (71.4 ft), and encased in a 5-inch NGS logo cap flush with the ground. BENCH MARK STAMPING: 0211 C 1995 DESIGNATION: 872 0211 C MONUMENTATION: Tidal Station disk VM#: 13467 AGENCY: National Ocean Service (NOS) IDB PID#: DL5785 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 24.0' N ( 30.39917) LONGITUDE: 81° 24.7' W ( -81.41167) The bench mark is a disk set flush in the south end of the small concrete waste water treatment pier, 28.0 m (92.0 ft) north of the NE corner of the waste treatment building, 5.0 m (16.5 ft) north of the south end of the waste treatment dock (a 0.9 m (3.0 ft) wide dock) and 4.3 m (14.2 ft) SW of the south end of a north-south 1.8 m (6.0 ft) tall chainlink fence line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: K 324 1970 DESIGNATION: K 324 MONUMENTATION: Bench Mark disk VM#: 13468 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC0464 SETTING CLASSIFICATION: Concrete Base OPUS PID: LATITUDE: 30° 23.9' N ( 30.39833) LONGITUDE: 81° 24.9' W ( -81.41472) The bench mark is a disk set flush in the top of the NW corner of the concrete base supporting a large steel bollard, 17.4 m (57.0 ft) SW of the NW corner of the basin, 6.2 m (20.2 ft) west of the west edge of the bulkhead, and 0.9 m (3.0 ft) NW of a large steel bollard.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TUG 1989 JAX. FL. DESIGNATION: TUG MONUMENTATION: Bench Mark disk VM#: 13469 AGENCY: US Army Corps of Engineers (USE) IDB PID#: DL5780 SETTING CLASSIFICATION: Concrete Base OPUS PID: LATITUDE: 30° 23.9' N ( 30.39833) LONGITUDE: 81° 24.8' W ( -81.41361) The bench mark is a disk set flush on the top of the NE corner of the concrete base supporting a large steel bollard, 27.4 m (90.0 ft) south of the approximate center of main street, 4.5 m (14.6 ft) south of the SE corner of a small building, and 1.3 m (4.3 ft) north of survey mark MP 7 1979.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MP-7 1979 DET 4 GSS DESIGNATION: MP 7 MONUMENTATION: Bench Mark disk VM#: 13470 AGENCY: US Army Corps of Engineers (USE) IDB PID#: DL5781 SETTING CLASSIFICATION: Concrete Base OPUS PID: LATITUDE: 30° 23.9' N ( 30.39861) LONGITUDE: 81° 24.8' W ( -81.41389) The bench mark is a disk set flush in the top of the NE corner of the concrete base supporting a large steel bollard, 27.4 m (90.0 ft) south of the approximate center of Main Street, 4.5 m (14.6 ft) south of the SE corner of a small building and 1.3 m (4.3 ft) north of survey mark TUG 1980.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) T I D A L D A T U M S Tidal datums at WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: November 2003 - October 2004 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720218 BAR PILOTS DOCK, ST JOHNS RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/27/2004) = 2.382 MEAN HIGHER HIGH WATER MHHW = 1.559 MEAN HIGH WATER MHW = 1.469 North American Vertical Datum NAVD88 = 0.947 MEAN SEA LEVEL MSL = 0.774 MEAN TIDE LEVEL MTL = 0.759 MEAN LOW WATER MLW = 0.047 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (03/08/2005) = -0.569 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0211 A 1995 3.634 2.165 0211 B 1995 3.259 1.790 0211 C 1995 3.261 1.792 K 324 1970 3.471 2.002 TUG 1989 JAX. FL. 3.691 2.222 MP-7 1979 DET 4 GSS 3.671 2.202
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8720211 PUBLICATION DATE: 08/25/2011 Name: WWTD, MAYPORT NAVAL STA., ST JOHNS RIVER FL NOAA Chart: 11490 Latitude: 30° 24.0' N ( 30.40000) USGS Quad: MAYPORT Longitude: 81° 24.8' W ( -81.41330) 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.