U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) To reach the tidal bench marks at the north end of Charlotte Harbor from Port Charlotte Beach, proceed by boat WNW (280 degrees) for 4.8 km (3.0 mi) to the east end of Hog Island at Locust Point. The bench marks are on Locust Point. The tide gage and staff were located offshore of a point of land surrounding a small bay. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5745 A 1977 DESIGNATION: 872 5745 A TIDAL MONUMENTATION: Tidal Station disk VM#: 7394 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The primary bench mark is a disk located 16.46 m (54.0 ft) west of bench mark 5745 B 1977, 6.71 m (22.0 ft) east of the west end of the grassy point of land on the north side of the small bay, 3 m (10 ft) south of the shoreline, and 0.46 m (1.5 ft) north of a witness post. The bench mark is 3 cm (0.1 ft) below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), and encased in a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5745 B 1977 DESIGNATION: 872 5745 B TIDAL MONUMENTATION: Tidal Station disk VM#: 7395 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The bench mark is a disk set in the top of a concrete monument, 13.72 m (45.0 ft) west of bench mark 5745 C 1977, 4 m (12 ft) south of the shoreline, 0.61 m (2.0 ft) south of an old witness post, 0.37 m (1.2 ft) north of a new witness post, and 0.06 m (0.2 ft) below ground level. BENCH MARK STAMPING: 5745 C 1977 DESIGNATION: 872 5745 C TIDAL MONUMENTATION: Tidal Station disk VM#: 7396 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The bench mark is a disk located east of the west end of the grassy point of land on the north side of the small bay, 1 m (4 ft) south of the shoreline, and 0.27 m (0.9 ft) north of a witness post. The bench mark is 0.27 m (0.9 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft), and encased in a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5745 E 1977 DESIGNATION: 872 5745 E TIDAL MONUMENTATION: Tidal Station disk VM#: 7397 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The bench mark is a disk located east of the west end of the grassy point of land on the north side of the small bay, 24.38 m (80.0 ft) east of bench mark 5745 C 1977, 2.74 m (9.0 ft) south of the shoreline, and 0.34 m (1.1 ft) north of a witness post. The bench mark is 0.21 m (0.7 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft), and encased in a concrete kickblock. BENCH MARK STAMPING: 5745 F 1977 DESIGNATION: 872 5745 F TIDAL MONUMENTATION: Tidal Station disk VM#: 7398 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The bench mark is a disk located east of the west end of the grassy point of land on the north side of the small bay, 68.58 m (225.0 ft) west of Locust Point, 23 m (75 ft) east of bench mark 5745 E 1977, and 0.30 m (1.0 ft) north of a witness post. The bench mark is 0.30 m (1.0 ft) above ground level, crimped to the top of a copper-clad steel rod driven 9.8 m (32.0 ft), and encased in a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5745 G 1981 DESIGNATION: 872 5745 G TIDAL MONUMENTATION: Tidal Station disk VM#: 7399 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 26° 55.8' N ( 26.93000) LONGITUDE: 82° 8.2' W ( -82.13670) The bench mark is a disk set in the top of a concrete monument located east of the west end of the grassy point of land, 16.46 m (54.0 ft) east of bench mark 5745 A 1977, 13.72 m (45.0 ft) west of bench mark 5745 C 1977, 3.66 m (12.0 ft) south of the shoreline, and 0.30 m (1.0 ft) west of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) T I D A L D A T U M S Tidal datums at LOCUST POINT, HOG ISLAND based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: April 1978 - May 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 = 0.594 MEAN HIGH WATER MHW = 0.498 MEAN TIDE LEVEL MTL = 0.313 MEAN SEA LEVEL MSL = 0.307 MEAN LOW WATER MLW = 0.127 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5745 A 1977 0.857 0.359 5745 B 1977 0.995 0.497 5745 C 1977 0.942 0.444 5745 E 1977 0.882 0.384 5745 F 1977 0.849 0.351 5745 G 1981 0.832 0.334 Foot Notes: Bench mark 5745 G 1981 is based on one differential leveling connection and does not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8725745 PUBLICATION DATE: 02/05/2004 Name: LOCUST POINT, HOG ISLAND FL NOAA Chart: 11426 Latitude: 26° 55.8' N ( 26.93000) USGS Quad: EL JOBEAN Longitude: 82° 8.2' W ( -82.13670) 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.