U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729824 PUBLICATION DATE: 04/29/2004 Name: FLORIDATOWN, ESCAMBIA BAY FL NOAA Chart: 11382 Latitude: 30° 34.9' N ( 30.58170) USGS Quad: PACE Longitude: 87° 10.8' W ( -87.18000) To reach the tidal bench marks from the south end of the U.S. Highway 90 bridge over Escambia Bay, proceed north on U.S. Highway 90 for 4.0 km (2.5 mi) to a dirt road leading south to the George Bell residence (9720 North Davis Highway). The bench marks are along U.S. Route 90 at the north end of Escambia Bay. The tide gage and staff were located at the dock beside U.S. Highway 90. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9824 A 1977 DESIGNATION: 872 9824 A TIDAL MONUMENTATION: Tidal Station disk VM#: 10263 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3609 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 30° 35.0' N ( 30.58330) LONGITUDE: 87° 10.7' W ( -87.17830) The primary bench mark is a disk set in the median of U.S. Highway 90, 94.79 m (311.0 ft) NE of the NE end of the northernmost of five bridges over Escambia Bay, 10.45 m (34.3 ft) SE of the centerline of the westbound lane, and 9.42 m (30.9 ft) NW of the centerline of the eastbound lane, 12.19 m (40.0 ft) NE of the centerline of a median crossover, and 0.3 m (1 ft) south of a witness post. The bench mark is crimped to the top of a galvanized steel rod driven 12.2 m (40.0 ft), and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8729824 PUBLICATION DATE: 04/29/2004 Name: FLORIDATOWN, ESCAMBIA BAY FL NOAA Chart: 11382 Latitude: 30° 34.9' N ( 30.58170) USGS Quad: PACE Longitude: 87° 10.8' W ( -87.18000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9824 B 1977 DESIGNATION: 872 9824 B TIDAL FLDT MONUMENTATION: Survey disk VM#: 10264 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: BG3608 SETTING CLASSIFICATION: Concrete curb of bridge OPUS PID#: BG3608 LATITUDE: 30° 34.9' N ( 30.58170) LONGITUDE: 87° 10.8' W ( -87.18000) The bench mark is a disk set in top of the curb at the north corner of the westbound bridge, NW of and across the westbound lane from bench mark 9824 C 1977, 5.15 m (16.9 ft) NW of the centerline of the westbound lane, 0.27 m (0.9 ft) SW of the NE end of the bridge, and 12 cm (0.4 ft) above the level of the road. BENCH MARK STAMPING: 9824 C 1977 DESIGNATION: 872 9824 C TIDAL FLDT MONUMENTATION: Survey disk VM#: 10265 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: BG3607 SETTING CLASSIFICATION: Concrete guardrail OPUS PID: LATITUDE: 30° 34.9' N ( 30.58170) LONGITUDE: 87° 10.8' W ( -87.18000) The bench mark is a disk set in the top of the concrete guardrail at the north corner of the eastbound bridge, 5.55 m (18.2 ft) NW of the centerline of the eastbound lane, and 0.9 m (3.0 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8729824 PUBLICATION DATE: 04/29/2004 Name: FLORIDATOWN, ESCAMBIA BAY FL NOAA Chart: 11382 Latitude: 30° 34.9' N ( 30.58170) USGS Quad: PACE Longitude: 87° 10.8' W ( -87.18000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9824 D 1977 DESIGNATION: 872 9824 D TIDAL FLDT MONUMENTATION: Survey disk VM#: 10266 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: BG3606 SETTING CLASSIFICATION: Concrete guardrail OPUS PID: LATITUDE: 30° 34.9' N ( 30.58170) LONGITUDE: 87° 10.8' W ( -87.18000) The bench mark is a disk set in the top of a concrete guardrail at the south corner of the eastbound bridge, 5.76 m (18.9 ft) SE of the centerline of the eastbound lane, and 0.15 m (0.5 ft) NE of the SW end of the bridge. BENCH MARK STAMPING: 9824 E 1977 DESIGNATION: 872 9824 E TIDAL FLDT MONUMENTATION: Survey disk VM#: 10267 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: BG3605 SETTING CLASSIFICATION: Concrete curb of bridge OPUS PID: LATITUDE: 30° 34.9' N ( 30.58170) LONGITUDE: 87° 10.8' W ( -87.18000) The bench mark is a disk set in the top of the bridge curb at the south corner of the westbound bridge, NW of and across the eastbound lane from bench mark 9824 D 1977, 5.24 m (17.2 ft) SE of the centerline of the west-bound lane, and 0.09 m (0.3 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8729824 PUBLICATION DATE: 04/29/2004 Name: FLORIDATOWN, ESCAMBIA BAY FL NOAA Chart: 11382 Latitude: 30° 34.9' N ( 30.58170) USGS Quad: PACE Longitude: 87° 10.8' W ( -87.18000) T I D A L D A T U M S Tidal datums at FLORIDATOWN, ESCAMBIA BAY based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: June 1977 - July 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.442 MEAN HIGH WATER MHW = 0.423 MEAN TIDE LEVEL MTL = 0.227 MEAN SEA LEVEL MSL = 0.217 North American Vertical Datum NAVD88 = 0.116 MEAN LOW WATER MLW = 0.030 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9824 A 1977 3.785 3.362 9824 B 1977 4.299 3.876 9824 C 1977 4.847 4.424 9824 D 1977 4.856 4.433 9824 E 1977 4.463 4.040
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729824 PUBLICATION DATE: 04/29/2004 Name: FLORIDATOWN, ESCAMBIA BAY FL NOAA Chart: 11382 Latitude: 30° 34.9' N ( 30.58170) USGS Quad: PACE Longitude: 87° 10.8' W ( -87.18000) 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.