U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8724947 PUBLICATION DATE: 02/05/2004 Name: CAPE ROMANO ISLAND FL NOAA Chart: 11429 Latitude: 25° 51.2' N ( 25.85330) USGS Quad: CAPE ROMANO Longitude: 81° 40.5' W ( -81.67500) To reach the tidal bench marks from the County Road 953 bridge over Big Marco River at Goodland, proceed by boat in a southerly direction for 5 km (3 statute mi) through the marked channel to Day Beacon "R2", then SW for 4.0 km (2.9 nm) to a small cottage on pilings with a dock on the west shore of Cape Romano Island. The bench marks are in the vicinity of the cottage owned by Mr. Ted Currie and to the south of the dock. The tide gage and staff were located on the dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4947 A 1978 DESIGNATION: 872 4947 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9705 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 25° 51.2' N ( 25.85330) LONGITUDE: 81° 40.5' W ( -81.67500) The primary bench mark is a disk located 8.26 m (27.1 ft) NW of the NE corner of the cottage, 8.05 m (26.4 ft) NE of the NW corner of the cottage, and 0.24 m (0.8 ft) south of a witness post. The bench mark is set 0.30 m (1.0 ft) above ground level, crimped to the top of an unspecified steel rod driven 9.8 m (32 ft) to resistance and encased in a 4-inch steel pipe projecting 0.40 m (1.3 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8724947 PUBLICATION DATE: 02/05/2004 Name: CAPE ROMANO ISLAND FL NOAA Chart: 11429 Latitude: 25° 51.2' N ( 25.85330) USGS Quad: CAPE ROMANO Longitude: 81° 40.5' W ( -81.67500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4947 B 1978 DESIGNATION: 872 4947 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9706 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 25° 51.2' N ( 25.85330) LONGITUDE: 81° 40.5' W ( -81.67500) The bench mark is a disk located 47 m (154 ft) WNW of bench mark 4947 A 1978, 5.43 m (17.8 ft) east of the east end of a canal, and 0.40 m (1.3 ft) east of a witness post. The bench mark is set 0.27 m (0.9 ft) above ground level, crimped to the top of an unspecified steel rod driven 9.8 m (32 ft) to resistance and encased in a 4-inch steel pipe projecting 0.46 m (1.5 ft). BENCH MARK STAMPING: 4947 C 1978 DESIGNATION: 872 4947 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9707 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 25° 51.2' N ( 25.85330) LONGITUDE: 81° 40.5' W ( -81.67500) The bench mark is a disk located 48.77 m (160.0 ft) south of bench mark 4947 B 1978, 24 m (80 ft) west of the approximate shoreline, and 0.40 m (1.3 ft) NNE of a witness post. The bench mark is set 0.18 m (0.6 ft) above ground level, crimped to the top of an unspecified steel rod driven 9.8 m (32 ft) to resistance and encased in a 4-inch steel pipe projecting 0.37 m (1.2 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8724947 PUBLICATION DATE: 02/05/2004 Name: CAPE ROMANO ISLAND FL NOAA Chart: 11429 Latitude: 25° 51.2' N ( 25.85330) USGS Quad: CAPE ROMANO Longitude: 81° 40.5' W ( -81.67500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4947 D 1978 DESIGNATION: 872 4947 D TIDAL MONUMENTATION: Tidal Station disk VM#: 9708 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 25° 51.2' N ( 25.85330) LONGITUDE: 81° 40.5' W ( -81.67500) The bench mark is a disk located 69.19 m (227.0 ft) SSW of bench mark 4947 C 1978, 23 m (75 ft) NW of the approximate shoreline, and 0.3 m (1 ft) NNE of a witness post. The bench mark is set 0.37 m (1.2 ft) above ground level, crimped to the top of an unspecified steel rod driven 9.8 m (32 ft) to resistance and encased in a 4-inch steel pipe projecting 0.46 m (1.5 ft). BENCH MARK STAMPING: 4947 E 1978 DESIGNATION: 872 4947 E TIDAL MONUMENTATION: Tidal Station disk VM#: 9709 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 25° 51.2' N ( 25.85330) LONGITUDE: 81° 40.5' W ( -81.67500) The bench mark is a disk located 88 m (289 ft) SSW of bench mark 4947 D 1978, 17 m (55 ft) NNE of the NW corner of a shanty on pilings, 4.94 m (16.2 ft) ENE of a 0.21 m (0.7 ft) diameter Sabal palm, and 0.40 m (1.3 ft) east of a witness post. The bench mark is set 0.24 m (0.8 ft) above ground level, crimped to the top of an unspecified steel rod driven 9.8 m (32 ft) to resistance and encased in a 4-inch steel pipe projecting 0.30 m (1.0 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8724947 PUBLICATION DATE: 02/05/2004 Name: CAPE ROMANO ISLAND FL NOAA Chart: 11429 Latitude: 25° 51.2' N ( 25.85330) USGS Quad: CAPE ROMANO Longitude: 81° 40.5' W ( -81.67500) T I D A L D A T U M S Tidal datums at CAPE ROMANO ISLAND based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: May 1978 - August 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8724919 CHOKOLOSKEE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.049 MEAN HIGH WATER MHW = 0.975 MEAN TIDE LEVEL MTL = 0.579 MEAN SEA LEVEL MSL = 0.559 MEAN LOW WATER MLW = 0.183 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4947 A 1978 1.668 0.693 4947 B 1978 2.315 1.340 4947 C 1978 2.174 1.199 4947 D 1978 2.018 1.043 4947 E 1978 1.761 0.786
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8724947 PUBLICATION DATE: 02/05/2004 Name: CAPE ROMANO ISLAND FL NOAA Chart: 11429 Latitude: 25° 51.2' N ( 25.85330) USGS Quad: CAPE ROMANO Longitude: 81° 40.5' W ( -81.67500) 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.