U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) To reach the tidal bench marks from the intersection of U.S. Alt. Route 19 and Klosterman Road (County Road 79), proceed south on U.S. Alt. Route 19 for 3.1 km (1.9 mi) to the intersection with Desoto Boulevard, then turn right and proceed north on Desoto Boulevard for 0.2 km (0.1 mi) to Oceanview Avenue, then turn left and proceed west on Oceanview Avenue for 0.6 km (0.4 mi) to Phillips Way, then turn right and proceed north on Phillips Way for 0.2 km (0.1 mi) to house # 117. The bench marks are located near house # 117 and near the intersection of Oceanview Avenue and Desoto Boulevard. The tide gage and staff were on the wood dock behind house # 117. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1975 DESIGNATION: 872 6853 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 7628 AGENCY: National Ocean Survey (NOS) IDB PID#: AL7485 SETTING CLASSIFICATION: Concrete patio OPUS PID: LATITUDE: 28° 6.2' N ( 28.10330) LONGITUDE: 82° 46.7' W ( -82.77830) The primary bench mark is a disk set in the SW corner of the concrete patio of the house at 117 Phillips Way, 28.19 m (92.5 ft) NE of Bench Mark NO 2 1975, and 0.61 m (2.0 ft) SW of the SE corner of the house.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1975 DESIGNATION: 872 6853 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 7629 AGENCY: National Ocean Survey (NOS) IDB PID#: AL7484 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 6.2' N ( 28.10330) LONGITUDE: 82° 46.7' W ( -82.77830) The bench mark is a disk located on the south property line of the house at 117 Phillips Way, 17 m (57 ft) SW of the SW corner of the house, 13.56 m (44.5 ft) west of the NW corner of house # 115, 6 m (21 ft) ENE of the centerline of Phillip Way and 0.67 m (2.2 ft) east of utility pole No. 117. The bench mark is 0.06 m (0.2 ft) below ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: NO 3 1975 DESIGNATION: 872 6853 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 7630 AGENCY: National Ocean Survey (NOS) IDB PID#: AL7483 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 28° 6.1' N ( 28.10170) LONGITUDE: 82° 46.4' W ( -82.77330) The bench mark is a disk located 0.2 km (0.1 mi) west of the intersection of Desoto Boulevard and Oceanview Avenue, 151 m (496 ft) NW of Bench Mark NO 4 1975, 12 m (39 ft) NNW of utility pole #12 A-4460R, 6 m (18 ft) NNE of the NE corner of the intersection of the railroad track and Ocean View Avenue, 4.72 m (15.5 ft) north of the centerline of Ocean View Avenue, 2.04 m (6.7 ft) SSW of a railroad signal light, and 0.76 m (2.5 ft) NW of a stop sign. The bench mark is 0.15 m (0.5 ft) below ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, 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 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1975 DESIGNATION: 872 6853 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 7631 AGENCY: National Ocean Survey (NOS) IDB PID#: AL7482 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AL7482 LATITUDE: 28° 6.0' N ( 28.10000) LONGITUDE: 82° 46.4' W ( -82.77330) The bench mark is a disk located at the SW corner of the intersection of Desoto Boulevard and Oceanview Avenue, 148 m (485 ft) north of Bench Mark INNISBROOK K, 8.69 m (28.5 ft) west of the centerline of Desoto Boulevard, 5.94 m (19.5 ft) south of the centerline of Ocean View Avenue, and 1.07 m (3.5 ft) north of utility pole #101-4. The bench mark is 0.30 m (0.3 ft) below ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: INNISBROOK K DESIGNATION: INNISBROOK K MONUMENTATION: Survey disk VM#: 7632 AGENCY: Pinellas County IDB PID#: AL0243 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 28° 6.0' N ( 28.10000) LONGITUDE: 82° 46.4' W ( -82.77330) The bench mark is a disk set into the top of a concrete monument SW of the intersection of U.S. Alt. Route 19 and Desoto Boulevard, 12 m (40 ft) SW of the SE corner of the Jersey Bar, 8 m (26 ft) SW of a Jersey Bar sign, 2.23 m (7.3 ft) SE of the SW corner of a brick driveway, 0.76 m (2.5 ft) NE of powerline pole # 12A-5828R.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) T I D A L D A T U M S Tidal datums at INDIAN BLUFF ISLAND based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: November 1975 - November 1975 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8726724 CLEARWATER BEACH, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.930 MEAN HIGH WATER MHW = 0.824 North American Vertical Datum NAVD88 = 0.583 MEAN SEA LEVEL MSL = 0.505 MEAN TIDE LEVEL MTL = 0.496 MEAN LOW WATER MLW = 0.168 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 1975 2.177 1.353 NO 2 1975 1.940 1.116 NO 3 1975 2.414 1.590 NO 4 1975 2.985 2.161 INNISBROOK K 8.556 7.732
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8726853 PUBLICATION DATE: 04/01/2004 Name: INDIAN BLUFF ISLAND FL NOAA Chart: 11412 Latitude: 28° 6.2' N ( 28.10330) USGS Quad: DUNEDIN Longitude: 82° 46.7' W ( -82.77830) 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.