U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8723355 PUBLICATION DATE: 02/26/2004 Name: RAGGED KEY NO. 5, BISCAYNE BAY FL NOAA Chart: 11465 Latitude: 25° 31.4' N ( 25.52330) USGS Quad: SOLDIER KEY Longitude: 80° 10.5' W ( -80.17500) To reach the tidal bench marks from the Florida Turnpike overpass of U.S. Highway 1 in Florida City, proceed north on U.S. Highway 1 for 1.0 km (0.6 mi) to Lucy Street, then east on Lucy Street for 14.2 km (8.8 mi) to the Biscayne National Park boat ramp. From there, proceed ENE by boat for 16.9 km (10.5 statute mi) to Boca Chita Key (also known as Ragged Key No. 5). The bench marks are in the vicinity of the boat basin. The tide gage and staff were SW of the boat basin near a stone wall. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3355 E 1987 DESIGNATION: 872 3355 E MONUMENTATION: Tidal Station disk VM#: 5818 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete flagpole base OPUS PID: LATITUDE: 25° 31.4' N ( 25.52330) LONGITUDE: 80° 10.6' W ( -80.17670) The primary bench mark is a disk set in a 2 m (6 ft) diameter concrete flag pole base, 91 m (300 ft) south of the lighthouse across from the boat basin entrance, 9.30 m (30.5 ft) NE of the NW corner of a stone fence, 9.02 m (29.6 ft) NNE of the NW corner of a gate opening, and 2.38 m (7.8 ft) SE of a sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8723355 PUBLICATION DATE: 02/26/2004 Name: RAGGED KEY NO. 5, BISCAYNE BAY FL NOAA Chart: 11465 Latitude: 25° 31.4' N ( 25.52330) USGS Quad: SOLDIER KEY Longitude: 80° 10.5' W ( -80.17500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3355 D 1987 DESIGNATION: 872 3355 D MONUMENTATION: Tidal Station disk VM#: 5817 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete walkway OPUS PID: LATITUDE: 25° 31.4' N ( 25.52330) LONGITUDE: 80° 10.6' W ( -80.17670) The bench mark is a disk set in the south side of a concrete walkway surrounding an ornamental lighthouse, 4.36 m (14.3 ft) north of the north end of a cannon, 2.47 m (8.1 ft) south of the south side of the lighthouse, and 0.15 m (0.5 ft) east of a 0.91 m (3.0 ft) high pillar. BENCH MARK STAMPING: 3355 F 1987 DESIGNATION: 872 3355 F MONUMENTATION: Tidal Station disk VM#: 5819 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 25° 31.4' N ( 25.52330) LONGITUDE: 80° 10.6' W ( -80.17670) The bench mark is a disk SE of the SE end of the boat basin, 43.28 m (142.0 ft) NNW of the north corner of the Captains Roost cabin, 41.03 m (134.6 ft) ENE of the NE corner of a stone and concrete foot bridge, 5.82 m (19.1 ft) SSE of the north edge of the boat basin sea wall, and 0.55 m (1.8 ft) SSE of a utility pole. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless steel rod driven 3.4 m (11 ft), and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8723355 PUBLICATION DATE: 02/26/2004 Name: RAGGED KEY NO. 5, BISCAYNE BAY FL NOAA Chart: 11465 Latitude: 25° 31.4' N ( 25.52330) USGS Quad: SOLDIER KEY Longitude: 80° 10.5' W ( -80.17500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3355 G 1987 DESIGNATION: 872 3355 G MONUMENTATION: Tidal Station disk VM#: 5820 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 25° 31.4' N ( 25.52330) LONGITUDE: 80° 10.6' W ( -80.17670) The bench mark is a disk SE of the boat basin, 46 m (150 ft) south of the SE corner of the "Gunkhole" cabin, 3 m (10 ft) SSE of the NE corner of a wall, and 0.55 m (1.8 ft) ENE of the east face of a 1.07 m (3.5 ft) high rock wall. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless steel rod driven 3.0 m (10 ft), and encased in a PVC pipe projecting 6 cm (0.2 ft) and a concrete kickblock. BENCH MARK STAMPING: 3355 H 1987 DESIGNATION: 872 3355 H MONUMENTATION: Tidal Station disk VM#: 5821 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete ramp OPUS PID: LATITUDE: 25° 31.4' N ( 25.52330) LONGITUDE: 80° 10.6' W ( -80.17670) The bench mark is a disk set in the concrete ramp of a large garage-type building SE of the boat basin, 98 m (321 ft) east of bench mark 3355 G 1987, 0.43 m (1.4 ft) NE of the NW corner of the building, and 0.15 m (0.5 ft) NNW of the north side of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8723355 PUBLICATION DATE: 02/26/2004 Name: RAGGED KEY NO. 5, BISCAYNE BAY FL NOAA Chart: 11465 Latitude: 25° 31.4' N ( 25.52330) USGS Quad: SOLDIER KEY Longitude: 80° 10.5' W ( -80.17500) T I D A L D A T U M S Tidal datums at RAGGED KEY NO. 5, BISCAYNE BAY based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: August 1987 - September 1987 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8723962 KEY COLONY BEACH Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.511 MEAN HIGH WATER MHW = 0.510 MEAN TIDE LEVEL MTL = 0.277 MEAN SEA LEVEL MSL = 0.272 MEAN LOW WATER MLW = 0.044 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 3355 E 1987 1.236 0.726 3355 D 1987 1.373 0.863 3355 F 1987 0.957 0.447 3355 G 1987 1.412 0.902 3355 H 1987 2.397 1.887
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8723355 PUBLICATION DATE: 02/26/2004 Name: RAGGED KEY NO. 5, BISCAYNE BAY FL NOAA Chart: 11465 Latitude: 25° 31.4' N ( 25.52330) USGS Quad: SOLDIER KEY Longitude: 80° 10.5' W ( -80.17500) 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.