U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) To reach the tidal bench marks from the 90 degree bend in U.S. Highway 41 in the city of Naples, proceed east on U.S. Highway 41 for 0.56 km (0.35 mi) to the first bridge over the Gordon River, then turn right and proceed south on River Point Drive to the Naples Sailing and Yacht Club. The bench marks are in the vicinity of the bridge and Yacht Club. The gage and staff were on a dock on the south end of the property. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5114 A 1978 DESIGNATION: 872 5114 A TIDAL MONUMENTATION: Tidal Station disk VM#: 7893 AGENCY: National Ocean Survey (NOS) IDB PID#: AD6328 SETTING CLASSIFICATION: Concrete manhole cover OPUS PID: LATITUDE: 26° 8.4' N ( 26.14000) LONGITUDE: 81° 47.3' W ( -81.78830) The primary bench mark is a disk set flush on the west side of a 1 m x 1 m (3 ft x 4 ft) concrete manhole cover at the Naples Sailing and Yacht Club, 91 m (300 ft) south of the south side of the pavement of the south bound lane of U.S. Highway 41, 7.92 m (26.0 ft) west of the centerline of River Point Drive, and 0.3 m (1 ft) SW of the NW corner of the most western lid of the manhole cover. NOTE: Mark not found in 1990 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BMT A 47 DESIGNATION: BMT A 47 MONUMENTATION: Survey disk VM#: 7840 AGENCY: LOCSUR IDB PID#: AD6329 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 26° 8.3' N ( 26.13830) LONGITUDE: 81° 47.3' W ( -81.78830) The bench mark is a disk set in the top of the sea wall on the east side of the club, 85 m (278 ft) NE of the juntion of the sea wall with the east-west running sea wall, and (0.8 ft) SW of the NE end of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BMT B 48 DESIGNATION: BMT B 48 MONUMENTATION: Survey disk VM#: 7841 AGENCY: LOCSUR IDB PID#: AD6330 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 26° 8.3' N ( 26.13830) LONGITUDE: 81° 47.3' W ( -81.78830) The bench mark is a disk set in the top of the SE end of a concrete sea wall running NW-SE, 88 m (287 ft) south of bench mark BMT B 48, 15 m (49 ft) south of the south corner of the yacht club, 15 m (48 ft) east of the SE corner of the patio, and 0.2 m (0.6 ft) north of the south side of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BMT C 49 DESIGNATION: BMT C 49 MONUMENTATION: Survey disk VM#: 7842 AGENCY: LOCSUR IDB PID#: AD6331 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 26° 8.3' N ( 26.13830) LONGITUDE: 81° 47.3' W ( -81.78830) The bench mark is a disk set in the top of a NW-SE running sea wall, 35.97 m (118.0 ft) north of the south end of the boat pier, 16 m (51 ft) SW of the west corner of the yacht club, and 13 m (43 ft) SW of a flagpole. BENCH MARK STAMPING: 14.98 DESIGNATION: 14.98 MONUMENTATION: Survey disk VM#: 7843 AGENCY: Florida State Road Department (FLSRD) IDB PID#: AD1249 SETTING CLASSIFICATION: Concrete bridge rail OPUS PID: LATITUDE: 26° 8.5' N ( 26.14170) LONGITUDE: 81° 47.4' W ( -81.79000) The bench mark is a disk set in the top of the north concrete bridge rail of bridge # 030013, 7.01 m (23.0 ft) north of the center of the westbound lanes of the highway, 0.21 m (0.7 ft) east of the west end of the north concrete bridge rail, and 1.2 m (3.9 ft) above highway level. NOTE: The bridge rail is part of the abutment.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) T I D A L D A T U M S Tidal datums at NAPLES BAY, NORTH based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: August 1978 - August 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.840 MEAN HIGH WATER MHW = 0.765 North American Vertical Datum NAVD88 = 0.630 MEAN SEA LEVEL MSL = 0.478 MEAN TIDE LEVEL MTL = 0.464 MEAN LOW WATER MLW = 0.163 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5114 A 1978 2.152 1.387 BMT A 47 1.422 0.657 BMT B 48 1.459 0.694 BMT C 49 1.443 0.678 14.98 4.857 4.092
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8725114 PUBLICATION DATE: 01/06/2004 Name: NAPLES BAY, NORTH FL NOAA Chart: 11429 Latitude: 26° 8.2' N ( 26.13670) USGS Quad: NAPLES NORTH Longitude: 81° 47.3' W ( -81.78830) 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.