U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) To reach the tidal bench marks from the Ruskin Post Office, drive 3.06 km (1.9 mi) SW on U.S. Route 41 to the bridge over the Little Manatee River, then 0.16 km (0.1 mi) north from the east end of the four lane concrete bridge on U.S. Route 41 over the Little Manatee River, to the Paradise Mobile Court for mobile homes which is on the north (right) side of the highway, and west to an old concrete bridge. The tide gage was on a wooden dock at the Paradise Mobile court, 10.67 m (35.0 ft) west of the east shoreline of the Little Manatee River, 0.37 m (1.2 ft) NW of the west most part of the dock, the staff was 5.43 m (17.8 ft) SE of the gage, and the bench marks are along U.S. Route 41 and the old highway bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6492 A 1977 DESIGNATION: 872 6492 A TIDAL MONUMENTATION: Tidal Station disk VM#: 6534 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7526 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 27° 44.6' N ( 27.74330) LONGITUDE: 82° 28.1' W ( -82.46830) The primary bench mark is a disk set flush in the concrete slab of the southern most picnic shelter and about 0.21 m (0.7 ft) above the level of the park road in the middle of three palm trees, about 91.44 m (300.0 ft) ESE of bench mark 6492 E 1977, 37.19 m (122.0 ft) WNW of bench mark 6492 B 1977, 7.92 m (26.0 ft) NE of the approximate centerline of a dirt track road, 7.01 m (23.0 ft) ESE of a palm tree, 5.18 m (17.0 ft) west of a palm tree, and 0.55 m (1.8 ft) NE of a palm tree.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6492 B 1977 DESIGNATION: 872 6492 B TIDAL MONUMENTATION: Tidal Station disk VM#: 6535 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7527 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 27° 44.6' N ( 27.74330) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set flush in the concrete slab of the southern-most picnic shelter and about 0.21 m (0.7 ft) above the level of the park road located 7.13 m (23.4 ft) NE of the approximate centerline of a dirt road, 1.13 m (3.7 ft) NE of the SW edge of the slab, and 0.70 m (2.3 ft) SW of the NW edge of the slab. BENCH MARK STAMPING: 6492 C 1977 DESIGNATION: 872 6492 C TIDAL MONUMENTATION: Tidal Station disk VM#: 6536 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7528 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 27° 44.6' N ( 27.74330) LONGITUDE: 82° 28.1' W ( -82.46830) The benchmark is a disk located 15.24 m (50.0 ft) SE of a bush palm, 8.53 m (28.0 ft) NE of the centerline of the paved drive, and 0.67 m (2.2 ft) north of the north corner of the paved parking lot.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6492 E 1977 DESIGNATION: 872 6492 E TIDAL MONUMENTATION: Tidal Station disk VM#: 6537 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7529 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 27° 44.6' N ( 27.74330) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set flush in the concrete slab of the southern most picnic shelter and located about 85.34 m (280.0 ft) SE of the northern most picnic shelter, 21.95 m (72.0 ft) NE of the NE corner of the turnaround, 7.62 m (25.0 ft) NE of the approximate centerline of a dirt track road, 5.03 m (16.5 ft) south of a 15-inch palm tree, 0.76 m (2.5 ft) NE of a 12-inch palm tree, and 0.21 m (0.7 ft) above the level of the paved road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: W 695 2007 DESIGNATION: W 695 MONUMENTATION: Survey disk VM#: 19654 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: DL1732 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 27° 44.1' N ( 27.73517) LONGITUDE: 82° 27.9' W ( -82.46439) The bench mark is a disk set in the top of a round concrete monument flush with the ground and about level with the parkway, 16.09 m (52.8 ft) north of the approximate centerline of a paved road leading west (a private drive), 11.89 m (39.0 ft) west of the centerline of E.G. Simmons Parkway, 3.11 m (10.2 ft) north of a wooden power pole #163292 (24991 33671) with one guy wire attached, 3.05 m (10.0 ft) north of a carsonite witness post, and west for 3.30 km (2.05 mi) to the junction of E.G. Simmons Parkway and the mark on the left. NOTE: A magnet was imbedded in the ground on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MAX 1991 DESIGNATION: MAX MONUMENTATION: Survey disk VM#: 19655 AGENCY: Hillsborough IDB PID#: DG8994 SETTING CLASSIFICATION: Concrete drain box OPUS PID: LATITUDE: 27° 44.4' N ( 27.73947) LONGITUDE: 82° 28.0' W ( -82.46639) The bench mark is a disk set flush in top of a 4 foot square concrete drain box located 18.23 m (59.8 ft) SW of a 7-inch palm tree, 9.54 m (31.3 ft) NE of the west end of a stone wall, 8.44 m (27.7 ft) NW of the east end of a stone wall, 23.07 m (75.7 ft) east of the west end of the curb for the cross-over road east of the bridge, 11.46 m (37.6 ft) south of the centerline of the south bound lane, 9.63 m (31.6 ft) north of the centerline of the north bound lane, 3.17 m (10.4 ft) west of a Nail and Hill County disk in the west edge of pavement of park exit road, 0.61 m (2.0 ft) below the road, 0.61 m (2.0 ft) east of a carsonite witness post and Hillsborough County sticker, and 0.15 m (0.5 ft) west of a witness post. NOTE: To reach the mark go to the entrance of E.G. Simmons Park and the mark on the left, located just inside the park on the west side of exit road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6492 G 2007 DESIGNATION: 872 6492 G MONUMENTATION: Tidal Station disk VM#: 19656 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: DL1876 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 27° 44.5' N ( 27.74236) LONGITUDE: 82° 28.0' W ( -82.46686) The bench mark is a disk set flush in the concrete slab of the southern most picnic shelter located 27.34 m (89.7 ft) NE of the approximate centerline of the service road, 10.61 m (34.8 ft) east of the NW corner of the picnic shelter, 6.86 m (22.5 ft) SW of the approximate centerline of a dirt road, 0.76 m (2.5 ft) west of the SE corner of the picnic shelter, and about 0.21 m (0.7 ft) above the level of the park road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) T I D A L D A T U M S Tidal datums at MANGROVE POINT INSIDE based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: April 1977 - August 1977 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: MEAN HIGHER HIGH WATER MHHW = 0.763 MEAN HIGH WATER MHW = 0.676 North American Vertical Datum NAVD88 = 0.502 MEAN SEA LEVEL MSL = 0.409 MEAN TIDE LEVEL MTL = 0.400 MEAN LOW WATER MLW = 0.125 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6492 A 1977 2.106 1.430 6492 B 1977 2.515 1.839 6492 C 1977 2.330 1.654 6492 E 1977 2.201 1.525 W 695 2007 1.917 1.241 MAX 1991 2.382 1.706 6492 G 2007 2.767 2.091 Foot Notes: Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control standards for Second Order, Class 1 leveling. It is advised that a confirmation set of levels be established for bench marks 6492 G 2007, MAX 1991, and W 695 2007 to verify height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8726492 PUBLICATION DATE: 02/08/2011 Name: MANGROVE POINT INSIDE FL NOAA Chart: 11412 Latitude: 27° 44.5' N ( 27.74170) USGS Quad: RUSKIN Longitude: 82° 28.0' W ( -82.46670) 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.