U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8726436 PUBLICATION DATE: 08/05/2005 Name: LITTLE MANATEE RIVER FL NOAA Chart: 11412 Latitude: 27° 42.3' N ( 27.70500) USGS Quad: RUSKIN Longitude: 82° 26.9' W ( -82.44830) To reach the tidal bench marks from the Ruskin Post Office, drive 3.0 km (1.9 mi) SW on U.S. Route 41 to the bridge over the Little Manatee River, then 0.2 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 mi) west of the east shoreline of the Little Manatee River, 0.37 m (1.2 mi) NW of the west most part of the dock, the staff was 5.43 m (17.8 mi) SE of the gage, and the bench marks are along U.S. Route 41 and the old highway birdge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6436 A 1977 DESIGNATION: 872 6436 A 1977 MONUMENTATION: Survey disk VM#: 12116 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7553 SETTING CLASSIFICATION: Concrete bridge curbing OPUS PID: LATITUDE: 27° 42.3' N ( 27.70500) LONGITUDE: 82° 26.9' W ( -82.44830) The primary bench mark is a disk set flush in the bridge surface 0.15 m (0.5 ft) above the surface of the road, 9.39 m (30.8 ft) south of the SE corner of the south bound lane bridge for U.S. Route 41, 5.33 m (17.5 ft) north of the centerline of the north bound lane of the bridge, and 0.55 m (1.8 ft) east of the NE edge of the bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8726436 PUBLICATION DATE: 08/05/2005 Name: LITTLE MANATEE RIVER FL NOAA Chart: 11412 Latitude: 27° 42.3' N ( 27.70500) USGS Quad: RUSKIN Longitude: 82° 26.9' W ( -82.44830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6436 B 1977 DESIGNATION: 872 6436 B 1977 MONUMENTATION: Survey disk VM#: 12117 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7551 SETTING CLASSIFICATION: Concrete drain box OPUS PID#: AG7551 LATITUDE: 27° 42.3' N ( 27.70500) LONGITUDE: 82° 26.9' W ( -82.44830) The bench mark is a disk set flush in top of a 1.22 (4.0 ft) square concrete drain box 0.61 m (2.0 ft) below the road, 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, and 0.15 m (0.5 ft) west of the witness post. BENCH MARK STAMPING: 6436 C 1977 DESIGNATION: 872 6436 C 1977 MONUMENTATION: Survey disk VM#: 12118 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7552 SETTING CLASSIFICATION: Concrete drain box OPUS PID#: AG7552 LATITUDE: 27° 42.3' N ( 27.70500) LONGITUDE: 82° 26.9' W ( -82.44830) The bench mark is a disk set flush in top of a 1.22 m (4.0 ft) square concrete drain box 0.61 m (2.0 ft) below the road, 111.25 m (365.0 ft) east of Bench Mark 6436 A 1977, 48 m (157 ft) west of Bench Mark 6436 B 1977, 10.67 m (35.0 ft) north of the centerline of the north bound lane, 9.81 m (32.2 ft) west of the east end of the median curb for the cross-over road, and 9.66 m (31.7 ft) south of the centerline of the south bound lane.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8726436 PUBLICATION DATE: 08/05/2005 Name: LITTLE MANATEE RIVER FL NOAA Chart: 11412 Latitude: 27° 42.3' N ( 27.70500) USGS Quad: RUSKIN Longitude: 82° 26.9' W ( -82.44830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6436 D DESIGNATION: 872 6436 D MONUMENTATION: Survey disk VM#: 12119 AGENCY: State Road Department IDB PID#: AG7554 SETTING CLASSIFICATION: Rail OPUS PID: LATITUDE: 27° 42.3' N ( 27.70500) LONGITUDE: 82° 26.9' W ( -82.44830) The bench mark is a disk set in top of the bridge rail 0.91 m (3.0 ft) above the surface of the bridge over the Little Manatee River on U.S. Route 41, 6.95 m (22.8 ft) north of the centerline of the south bound lane of the U.S. Route 41 bridge, and 1.80 m (5.9 ft) west of the NE corner of the south bound lane of the bridge. BENCH MARK STAMPING: LMR4 1961 JACKSONVILLE DESIGNATION: 872 6436 LMR4 1961 JACKS MONUMENTATION: Survey disk VM#: 12120 AGENCY: COE IDB PID#: AG6194 SETTING CLASSIFICATION: Concrete bridge walkway OPUS PID: LATITUDE: 27° 42.3' N ( 27.70500) LONGITUDE: 82° 26.9' W ( -82.44830) The bench mark is a disk set flush in the bridge surface 0.15 m (0.5 ft) above the surface of the road, 7.62 m (25.0 ft) NE of Bench Mark 6436 D, 6.74 m (22.1 ft) west of a witness post, 5.03 m (16.5 ft) north of the centerline of the old bridge, 4.60 m (15.1 ft) west of the NE corner of the old bridge, and 0.61 m (2.0 ft) south of the north edge of the old bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8726436 PUBLICATION DATE: 08/05/2005 Name: LITTLE MANATEE RIVER FL NOAA Chart: 11412 Latitude: 27° 42.3' N ( 27.70500) USGS Quad: RUSKIN Longitude: 82° 26.9' W ( -82.44830) T I D A L D A T U M S Tidal datums at LITTLE MANATEE RIVER based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: December 1978 - March 1979 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 = 0.606 MEAN HIGH WATER MHW = 0.549 North American Vertical Datum NAVD88 = 0.390 MEAN SEA LEVEL MSL = 0.314 MEAN TIDE LEVEL MTL = 0.314 MEAN LOW WATER MLW = 0.079 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6436 A 1977 8.453 7.904 6436 B 1977 3.945 3.396 6436 C 1977 4.729 4.180 6436 D 8.803 8.254 LMR4 1961 JACKSONVILLE 4.624 4.075
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8726436 PUBLICATION DATE: 08/05/2005 Name: LITTLE MANATEE RIVER FL NOAA Chart: 11412 Latitude: 27° 42.3' N ( 27.70500) USGS Quad: RUSKIN Longitude: 82° 26.9' W ( -82.44830) 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.