U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8727956 PUBLICATION DATE: 05/20/2004 Name: ECONFINA RIVER, INSIDE FL NOAA Chart: 11405 Latitude: 30° 3.2' N ( 30.05330) USGS Quad: SNIPE ISLAND Longitude: 83° 54.6' W ( -83.91000) To reach the tidal bench marks from the intersection of U.S. Highway 98 and U.S. Highway 19 in Perry, proceed west on U.S. Highway 98 for 32.2 km (20.0 mi) to the intersection of County Road C-14, then turn left and proceed south on County Road C-14 for 8.7 km (5.4 mi) to a dirt road on the left, then turn and proceed east on the dirt road for 1.3 km (0.8 mi) to a crossroads, then turn and proceed south on the dirt road for 1.4 km (0.9 mi) to the last cottage at the road's end. The bench marks are located along the dirt road, and the tide gage and staff were located on a catwalk in front of the cottage. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7956 A 1977 DESIGNATION: 872 7956 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8259 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BD2686 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 3.3' N ( 30.05500) LONGITUDE: 83° 54.6' W ( -83.91000) The primary bench mark is a disk located 13.29 m (43.6 ft) SW of the SW corner of a cottage, 4.51 m (14.8 ft) east of the NE corner of the last cottage, 3.23 m (10.6 ft) ESE of a live oak tree, and 0.06 m (0.2 ft) NE of a metal witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8727956 PUBLICATION DATE: 05/20/2004 Name: ECONFINA RIVER, INSIDE FL NOAA Chart: 11405 Latitude: 30° 3.2' N ( 30.05330) USGS Quad: SNIPE ISLAND Longitude: 83° 54.6' W ( -83.91000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7956 B 1977 DESIGNATION: 872 7956 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8260 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BD2685 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 3.3' N ( 30.05500) LONGITUDE: 83° 54.5' W ( -83.90830) The bench mark is a disk located 73 m (240 ft) NE of bench mark 7956 A 1977, 10.85 m (35.6 ft) west of a live oak tree, 4 m (13 ft) SE of the centerline of the road, 2.41 m (7.9 ft) NNW of another live oak tree, and 0.09 m (0.3 ft) NW of a metal witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to refusal, and encased in PVC pipe and concrete kickblock. BENCH MARK STAMPING: 7956 C 1977 DESIGNATION: 872 7956 C TIDAL MONUMENTATION: Tidal Station disk VM#: 8261 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BD2684 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 3.3' N ( 30.05500) LONGITUDE: 83° 54.5' W ( -83.90830) The bench mark is a disk located 61 m (200 ft) NE of bench mark 7956 B 1977, 11.28 m (37.0 ft) east of a gate to a driveway, 4.24 m (13.9 ft) SE of the centerline of the dirt road, and 0.12 m (0.4 ft) north of a metal witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) 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 5 Station ID: 8727956 PUBLICATION DATE: 05/20/2004 Name: ECONFINA RIVER, INSIDE FL NOAA Chart: 11405 Latitude: 30° 3.2' N ( 30.05330) USGS Quad: SNIPE ISLAND Longitude: 83° 54.6' W ( -83.91000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7956 D 1977 DESIGNATION: 872 7956 D TIDAL MONUMENTATION: Tidal Station disk VM#: 8262 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BD2683 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 3.3' N ( 30.05500) LONGITUDE: 83° 54.5' W ( -83.90830) The bench mark is a disk set in the top of a concrete monument, 102 m (335 ft) ENE of bench mark 7956 C 1977, 29.38 m (96.4 ft) ESE of a powerline pole, 10.03 m (32.9 ft) SSE of the centerline of the dirt road, 0.15 m (0.5 ft) west of a metal witness post, and at ground level. BENCH MARK STAMPING: 7956 E 1977 DESIGNATION: 872 7956 E TIDAL MONUMENTATION: Tidal Station disk VM#: 8263 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: BD2682 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 3.3' N ( 30.05500) LONGITUDE: 83° 54.4' W ( -83.90670) The bench mark is a disk set in the top of a concrete monument, 78 m (255 ft) ENE of bench mark 7956 D 1977, 11.61 m (38.1 ft) WSW of a powerline pole, 11.37 m (37.3 ft) SSE of the centerline of a dirt road, 0.15 m (0.5 ft) NNW of a metal witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8727956 PUBLICATION DATE: 05/20/2004 Name: ECONFINA RIVER, INSIDE FL NOAA Chart: 11405 Latitude: 30° 3.2' N ( 30.05330) USGS Quad: SNIPE ISLAND Longitude: 83° 54.6' W ( -83.91000) T I D A L D A T U M S Tidal datums at ECONFINA RIVER, INSIDE based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: February 1977 - March 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.972 MEAN HIGH WATER MHW = 0.895 MEAN TIDE LEVEL MTL = 0.517 MEAN SEA LEVEL MSL = 0.465 North American Vertical Datum NAVD88 = 0.390 MEAN LOW WATER MLW = 0.138 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7956 A 1977 1.493 0.598 7956 B 1977 1.587 0.692 7956 C 1977 1.777 0.882 7956 D 1977 1.283 0.388 7956 E 1977 1.442 0.547
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8727956 PUBLICATION DATE: 05/20/2004 Name: ECONFINA RIVER, INSIDE FL NOAA Chart: 11405 Latitude: 30° 3.2' N ( 30.05330) USGS Quad: SNIPE ISLAND Longitude: 83° 54.6' W ( -83.91000) 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.