U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8724226 PUBLICATION DATE: 05/12/2004 Name: BIG PINE KEY, NORTH EAST SHORE FL NOAA Chart: 11448 Latitude: 24° 43.7' N ( 24.72830) USGS Quad: SUMMERLAND KEY Longitude: 81° 23.2' W ( -81.38670) To reach the tidal bench marks from the intersection of U.S. Highway 1 and State Highway S-940, proceed NW on S-940 for 6.9 km (4.3 mi) to the end of the road. The bench marks are located at the end of the road and in the vicinity of a cut. The tide gage and staff were located in the cut. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1974 DESIGNATION: 872 4226 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 8997 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 43.7' N ( 24.72830) LONGITUDE: 81° 23.2' W ( -81.38670) The primary bench mark is a disk located at the intersection of a drainage ditch and the south shore of the cut, 107 m (350 ft) east and 46 m (150 ft) south of the end of S-940, 3 m (11 ft) SE of the south shore of the cut, and 1 m (4 ft) west of a drainage ditch. The bench mark is set 15 cm (0.5 ft) above the ground, crimped to a copper-clad rod driven to refusal. BENCH MARK STAMPING: NO 2 1974 DESIGNATION: 872 4226 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 8998 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 43.7' N ( 24.72830) LONGITUDE: 81° 23.2' W ( -81.38670) The bench mark is a disk set in concrete, 42 m (137 ft) SW of bench mark NO 1 1974, 15 m (50 ft) SE of the south shore of the cut, and 15 m (50 ft) NW of a drainage ditch running parallel to the cut. The bench mark is set 20 cm (0.8 ft) above the ground, crimped to a copper-clad rod driven to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8724226 PUBLICATION DATE: 05/12/2004 Name: BIG PINE KEY, NORTH EAST SHORE FL NOAA Chart: 11448 Latitude: 24° 43.7' N ( 24.72830) USGS Quad: SUMMERLAND KEY Longitude: 81° 23.2' W ( -81.38670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1974 DESIGNATION: 872 4226 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 8999 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 43.7' N ( 24.72830) LONGITUDE: 81° 23.2' W ( -81.38670) The bench mark is a disk set in concrete, approximately 46 m (150 ft) south and 12 m (38 ft) east of the end of S-940, 21 m (70 ft) west of the north shore of the cut, and 3 m (9 ft) north of a dirt road leading to the cut. The bench mark is set 15 cm (0.5 ft) above the ground, crimped to a copper-clad rod driven to refusal. BENCH MARK STAMPING: NO 4 1974 DESIGNATION: 872 4226 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 9000 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 43.7' N ( 24.72830) LONGITUDE: 81° 23.2' W ( -81.38670) The bench mark is a disk set in concrete, 51 m (166 ft) NW of bench mark NO 3 1974, 15 m (50 ft) south of a drainage ditch running perpendicular to the road, and 1 m (2 ft) north of the end of S-940 in the path of the road. The bench mark is set 15 cm (0.5 ft) above the ground, crimped to a copper-clad rod driven to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8724226 PUBLICATION DATE: 05/12/2004 Name: BIG PINE KEY, NORTH EAST SHORE FL NOAA Chart: 11448 Latitude: 24° 43.7' N ( 24.72830) USGS Quad: SUMMERLAND KEY Longitude: 81° 23.2' W ( -81.38670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 5 1974 DESIGNATION: 872 4226 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 9001 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 24° 43.7' N ( 24.72830) LONGITUDE: 81° 23.2' W ( -81.38670) The bench mark is a disk, 56 m (184 ft) SW of bench mark NO 4 1974, 46 m (150 ft) south and 13 m (43 ft) west of the end of S-940, 31 m (101 ft) west of bench mark NO 3 1974, and 11 m (35 ft) east of a drainage canal running parallel to the road. The bench mark is set 15 cm (0.5 ft) above the ground, crimped to a copper-clad rod driven to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8724226 PUBLICATION DATE: 05/12/2004 Name: BIG PINE KEY, NORTH EAST SHORE FL NOAA Chart: 11448 Latitude: 24° 43.7' N ( 24.72830) USGS Quad: SUMMERLAND KEY Longitude: 81° 23.2' W ( -81.38670) T I D A L D A T U M S Tidal datums at BIG PINE KEY, NORTH EAST SHORE 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 = 0.458 MEAN HIGH WATER MHW = 0.403 MEAN TIDE LEVEL MTL = 0.241 MEAN SEA LEVEL MSL = 0.241 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 NO 1 1974 0.689 0.286 NO 2 1974 0.836 0.433 NO 3 1974 0.871 0.468 NO 4 1974 1.130 0.727 NO 5 1974 0.941 0.538
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8724226 PUBLICATION DATE: 05/12/2004 Name: BIG PINE KEY, NORTH EAST SHORE FL NOAA Chart: 11448 Latitude: 24° 43.7' N ( 24.72830) USGS Quad: SUMMERLAND KEY Longitude: 81° 23.2' W ( -81.38670) 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.