U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8725259 PUBLICATION DATE: 11/13/2003 Name: LITTLE HICKORY BAY FL NOAA Chart: 11426 Latitude: 26° 19.8' N ( 26.33000) USGS Quad: BONITA SPRINGS Longitude: 81° 50.3' W ( -81.83830) To reach the tidal bench marks from the intersection of U.S. Highway 41 (South Tamiami Trail) and Bonita Beach Road, proceed west on Bonita Beach Road for 3.5 km (2.2 mi) to Little Hickory Bay Bridge. The bench marks are located on the bridge and to the west of the bridge. The tide gage and staff were located due west of a two story apartment house NW of the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5259 C 1978 DESIGNATION: 872 5259 C TIDAL MONUMENTATION: Tidal Station disk VM#: 7858 AGENCY: National Ocean Survey (NOS) IDB PID#: AD7881 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 26° 19.9' N ( 26.33170) LONGITUDE: 81° 50.3' W ( -81.83830) The primary bench mark is a disk set in the top of a concrete monument west of the bridge, 79 m (258 ft) west of Bench Mark 5259 B 1978, 61 m (200 ft) west of the west end of the bridge, 17.65 m (57.9 ft) north of the centerline of Bonita Beach Road, and 0.37 m (1.2 ft) west of a utility pole. NOTE: Mark not found by US Power Squadron in 1998 and 1999.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8725259 PUBLICATION DATE: 11/13/2003 Name: LITTLE HICKORY BAY FL NOAA Chart: 11426 Latitude: 26° 19.8' N ( 26.33000) USGS Quad: BONITA SPRINGS Longitude: 81° 50.3' W ( -81.83830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Z 245 1 5259 DESIGNATION: Z 245 MONUMENTATION: Survey disk VM#: 7855 AGENCY: Florida State Road Department (FLSRD) IDB PID#: AD1301 SETTING CLASSIFICATION: Concrete bridge OPUS PID: LATITUDE: 26° 19.8' N ( 26.33000) LONGITUDE: 81° 50.2' W ( -81.83670) The bench mark is a disk set in the NE corner of the bridge, 5.61 m (18.4 ft) north of the centerline of Bonita Beach Road, and about level with the road. NOTE: Mark not found by US Power Squadron in 1998. BENCH MARK STAMPING: 5259 B 1978 DESIGNATION: 872 5259 B TIDAL MONUMENTATION: Tidal Station disk VM#: 7857 AGENCY: National Ocean Survey (NOS) IDB PID#: AD7880 SETTING CLASSIFICATION: Sea wall OPUS PID: LATITUDE: 26° 19.9' N ( 26.33170) LONGITUDE: 81° 50.2' W ( -81.83670) The bench mark is a disk set flush in a sea wall north of the bridge, 34 m (112 ft) south of the NE corner of the sea wall, 15 m (50 ft) north of the west end of the bridge, 4.94 m (16.2 ft) SE of the SE corner of a real estate office, and 0.30 m (1.0 ft) north of the south end of the sea wall. NOTE: Mark not found by US Power Squadron in 1999.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8725259 PUBLICATION DATE: 11/13/2003 Name: LITTLE HICKORY BAY FL NOAA Chart: 11426 Latitude: 26° 19.8' N ( 26.33000) USGS Quad: BONITA SPRINGS Longitude: 81° 50.3' W ( -81.83830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5259 D 1978 DESIGNATION: 872 5259 D TIDAL MONUMENTATION: Tidal Station disk VM#: 7859 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 26° 19.8' N ( 26.33000) LONGITUDE: 81° 50.3' W ( -81.83830) The bench mark is a disk located 104 m (340 ft) west of Bench Mark 5259 C 1978, 17.34 m (56.9 ft) north of the centerline of Bonita Beach Road, 0.37 m (1.2 ft) south of United System utility pole #2065, and 0.15 m (0.5 ft) south of a witness sign. The bench mark is 0.09 m (0.3 ft) above the ground, crimped to the top of a galvanized steel rod driven 11.0 m (36 ft) to refusal, and encased in a 4-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8725259 PUBLICATION DATE: 11/13/2003 Name: LITTLE HICKORY BAY FL NOAA Chart: 11426 Latitude: 26° 19.8' N ( 26.33000) USGS Quad: BONITA SPRINGS Longitude: 81° 50.3' W ( -81.83830) T I D A L D A T U M S Tidal datums at LITTLE HICKORY BAY based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: March 1978 - August 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8725235 WIGGINS PASS, INSIDE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.256 North American Vertical Datum NAVD88 = 0.214 MEAN HIGH WATER MHW = 0.207 MEAN TIDE LEVEL MTL = 0.122 MEAN SEA LEVEL MSL = 0.118 MEAN LOW WATER MLW = 0.036 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5259 C 1978 1.332 1.125 Z 245 1 5259 4.723 4.516 5259 B 1978 1.045 0.838 5259 D 1978 1.142 0.935
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8725259 PUBLICATION DATE: 11/13/2003 Name: LITTLE HICKORY BAY FL NOAA Chart: 11426 Latitude: 26° 19.8' N ( 26.33000) USGS Quad: BONITA SPRINGS Longitude: 81° 50.3' W ( -81.83830) 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.