U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8724192 PUBLICATION DATE: 02/05/2004 Name: BIG PINE KEY, COUPON BIGHT INSIDE FL NOAA Chart: 11448 Latitude: 24° 39.1' N ( 24.65170) USGS Quad: BIG PINE KEY Longitude: 81° 21.0' W ( -81.35000) To reach the tidal bench marks from the west end of the U.S. Highway 1 bridge crossing Spanish Harbor, proceed NW on U.S. Highway 1 for 1.1 km (0.7 mi) to a prominent sand berm projecting westerly into Coupon Bight. The bench marks are along the sand berm, 0.3 km (0.2 mi) SE of two small mangrove islands in the bight. The tide station was SW of the western tip of the sand berm and due south of the two small mangrove islands in the bight. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1974 DESIGNATION: 872 4192 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 6411 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 21.0' W ( -81.35000) The primary bench mark is a disk located on a sand berm on a prominent point on Bights's east shore, 21 m (70 ft) SE of the NW point of the sand berm, 14 m (45 ft) NE of the SW edge of mangroves, 8 m (26 ft) NE of the approximate high water line along the western shore, and 0.21 m (0.7 ft) west of a witness post. The bench mark is set 27 cm (0.9 ft) above ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 4-inch steel pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8724192 PUBLICATION DATE: 02/05/2004 Name: BIG PINE KEY, COUPON BIGHT INSIDE FL NOAA Chart: 11448 Latitude: 24° 39.1' N ( 24.65170) USGS Quad: BIG PINE KEY Longitude: 81° 21.0' W ( -81.35000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1974 DESIGNATION: 872 4192 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 6412 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 21.0' W ( -81.35000) The bench mark is a disk located on a sand berm on a prominent point on Bights's east shore, 20 m (66 ft) SE of bench mark NO 1 1974, 13.72 m (45.0 ft) NE of the SW edge of mangroves, 8 m (27 ft) NE of the approximate high water line along the western shore, and 0.46 m (1.5 ft) SW of a witness post. The bench mark is set 21 cm (0.7 ft) above ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 4-inch steel pipe. BENCH MARK STAMPING: NO 3 1974 DESIGNATION: 872 4192 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 6413 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 21.0' W ( -81.35000) The bench mark is a disk located on a sand berm on a prominent point on Bights's east shore, 15 m (50 ft) NE of the outer edge of mangroves, 13 m (42 ft) SE of bench mark NO 5 1974, 0.15 m (0.5 ft) SW of a witness post. The bench mark is set 12 cm (0.4 ft) above ground level, crimped to the top of a copper-clad rod driven an unspecified depth to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8724192 PUBLICATION DATE: 02/05/2004 Name: BIG PINE KEY, COUPON BIGHT INSIDE FL NOAA Chart: 11448 Latitude: 24° 39.1' N ( 24.65170) USGS Quad: BIG PINE KEY Longitude: 81° 21.0' W ( -81.35000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1974 DESIGNATION: 872 4192 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 6414 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 21.0' W ( -81.35000) The bench mark is a disk located on a sand berm on a prominent point on Bights's east shore, 90 m (296 ft) SE of the NW point of the sand berm, 19.51 m (64.0 ft) SE of bench mark NO 3 1974, 14.02 m (46.0 ft) NE of the outer edge of mangroves, 3.2 m (10.5 ft) NE of the approximate high water line of the western shore, and 0.30 m (1.0 ft) SW of a witness post. The bench mark is set 6 cm (0.2 ft) above ground level, crimped to the top of a copper-clad rod driven an unspecified depth to refusal. BENCH MARK STAMPING: NO 5 1974 DESIGNATION: 872 4192 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 6415 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 21.0' W ( -81.35000) The bench mark is a disk located on a sand berm on a prominent point on Bights's east shore, 18 m (58 ft) NE of the outer edge of mangroves, 16.00 m (52.5 ft) SE of bench mark NO 2 1974, 11 m (35 ft) NE of the approximate high water line of the western shore, 3 m (9 ft) west of the low marsh area, and 0.40 m (1.3 ft) SW of a witness post. The bench mark is set 12 cm (0.4 ft) above ground level, crimped to the top of a copper-clad rod driven an unspecified depth to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8724192 PUBLICATION DATE: 02/05/2004 Name: BIG PINE KEY, COUPON BIGHT INSIDE FL NOAA Chart: 11448 Latitude: 24° 39.1' N ( 24.65170) USGS Quad: BIG PINE KEY Longitude: 81° 21.0' W ( -81.35000) T I D A L D A T U M S Tidal datums at BIG PINE KEY, COUPON BIGHT INSIDE based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: October 1974 - October 1974 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8724580 KEY WEST Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.482 MEAN HIGH WATER MHW = 0.401 MEAN SEA LEVEL MSL = 0.223 MEAN TIDE LEVEL MTL = 0.219 MEAN LOW WATER MLW = 0.037 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1974 1.143 0.742 NO 2 1974 1.274 0.873 NO 3 1974 1.193 0.792 NO 4 1974 0.910 0.509 NO 5 1974 1.266 0.865
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8724192 PUBLICATION DATE: 02/05/2004 Name: BIG PINE KEY, COUPON BIGHT INSIDE FL NOAA Chart: 11448 Latitude: 24° 39.1' N ( 24.65170) USGS Quad: BIG PINE KEY Longitude: 81° 21.0' W ( -81.35000) 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.