U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) To reach the tidal bench marks from the Catholic Church in Key West, proceed 31.7 km (19.7 mi) NE along U.S. Highway 1 to the east end of the New Bow Channel Bridge at Cudjoe Key. The bench marks are located along U.S. Highway 1. The tide gage and staff were located on the New Bow Channel Bridge. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: M 70 RESET 1938 DESIGNATION: M 70 RESET MONUMENTATION: Bench Mark disk VM#: 6959 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AA0159 SETTING CLASSIFICATION: Concrete wing wall OPUS PID: LATITUDE: 24° 39.7' N ( 24.66170) LONGITUDE: 81° 30.9' W ( -81.51500) The primary bench mark is a disk set on the top of the south concrete wingwall at the east end of Bow Channel Viaduct (bridge No. 9A), 5 m (15 ft) south of the centerline of U.S. Highway 1, and 1 m (3 ft) below highway level. BENCH MARK STAMPING: 4332 F 1982 DESIGNATION: 872 4332 F TIDAL MONUMENTATION: Bench Mark disk VM#: 6955 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: AA0725 SETTING CLASSIFICATION: Concrete bridge guardrail OPUS PID: LATITUDE: 24° 39.7' N ( 24.66170) LONGITUDE: 81° 30.9' W ( -81.51500) The bench mark is a disk set flush in the top of the NE end of the concrete guardrail for the new Bow Channel Bridge, 5.85 m (19.2 ft) north of the centerline of the highway, 3 m (10 ft) west of the NE end of the guardrail, and 0.91 m (3.0 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4332 G 1982 DESIGNATION: 872 4332 G TIDAL MONUMENTATION: Tidal Station disk VM#: 6956 AGENCY: National Ocean Service (NOS) IDB PID#: AA0724 SETTING CLASSIFICATION: Concrete bridge guardrail OPUS PID: LATITUDE: 24° 39.7' N ( 24.66170) LONGITUDE: 81° 30.9' W ( -81.51500) The bench mark is a disk set flush in the top of the SE concrete guardrail, 5.85 m (19.2 ft) south of the centerline of the highway, 0.21 m (0.7 ft) west of the SE corner of the guardrail, and 0.91 m (3.0 ft) above the level of the highway. BENCH MARK STAMPING: 4332 H 1982 DESIGNATION: 872 4332 H TIDAL MONUMENTATION: Tidal Station disk VM#: 6957 AGENCY: National Ocean Service (NOS) IDB PID#: AA0723 SETTING CLASSIFICATION: Concrete wing wall OPUS PID: LATITUDE: 24° 39.7' N ( 24.66170) LONGITUDE: 81° 30.9' W ( -81.51500) The bench mark is a disk set in the wingwall that supports the main waterline for the Keys, 7.19 m (23.6 ft) SSW of the centerline of the New Bow Channel Bridge, 3.32 m (10.9 ft) WSW of bench mark 4332 G 1982, 1.10 m (3.6 ft) SSW of the SE corner of the concrete rail, 0.14 m (0.45 ft) NNE of the south end of the wingwall, and 0.43 m (1.4 ft) below the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: G 272 1966 DESIGNATION: G 272 MONUMENTATION: Bench Mark disk VM#: 6960 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AA0153 SETTING CLASSIFICATION: Concrete wing wall OPUS PID: LATITUDE: 24° 39.6' N ( 24.66000) LONGITUDE: 81° 31.1' W ( -81.51830) The bench mark is a disk set in the top of a south concrete wingwall at the west end of Bow Channel Viaduct (bridge No. 9A) at the turn in the wingwall, 20 m (64 ft) south of the centerline of U.S. Highway 1, 3 m (11 ft) east of the west end of a wingwall, and 3 m (10 ft) below highway level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: T 328 1970 DESIGNATION: T 328 MONUMENTATION: Bench Mark disk VM#: 6962 AGENCY: National Geodetic Survey (NGS) IDB PID#: AA0158 SETTING CLASSIFICATION: Concrete wing wall OPUS PID: LATITUDE: 24° 39.7' N ( 24.66170) LONGITUDE: 81° 30.9' W ( -81.51500) The bench mark is a disk set flush in the top of the south concrete wingwall of the Bow Channel Viaduct, 20 m (67 ft) south of the centerline of Route 1, 17.59 m (57.7 ft) SE of bench mark M 70 RESET 1938, and 6 m (20 ft) west of the east end of the wingwall, and 3 m (10 ft) below highway level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) T I D A L D A T U M S Tidal datums at CUDJOE KEY PIRATES COVE based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: January 1971 - December 1971 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8724580 KEY WEST Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (11/04/1971) = 0.703 MEAN HIGHER HIGH WATER MHHW = 0.427 North American Vertical Datum NAVD88 = 0.370 MEAN HIGH WATER MHW = 0.357 MEAN TIDE LEVEL MTL = 0.207 MEAN SEA LEVEL MSL = 0.190 MEAN LOW WATER MLW = 0.057 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (08/31/1974) = -0.266 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW M 70 RESET 1938 3.868 3.511 4332 F 1982 5.063 4.706 4332 G 1982 5.046 4.689 4332 H 1982 3.796 3.439 G 272 1966 0.962 0.605 T 328 1970 0.971 0.614 Foot Notes: Bench marks 4332 F 1982, 4332 G 1982, 4332 H 1982, and G 272 1966 are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8724332 PUBLICATION DATE: 06/09/2003 Name: CUDJOE KEY PIRATES COVE FL NOAA Chart: 11434 Latitude: 24° 39.7' N ( 24.66170) USGS Quad: SUGARLOAF KEY Longitude: 81° 30.9' W ( -81.51500) 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.