U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) To reach from the intersection of state highway 193 and county road 24 (laurendine rd) in belle fontaine, proceed on route 193 for 6.0 km (3.7 mi) then turn left onto old cedar point road and continue 0.3 km (0.2 mi) to the fowl river marina. The bench marks are located at the marina and along Rt 193 north of the bridge. The gauge is located on the top of the 193 bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5523 C 2011 DESIGNATION: 873 5523 C MONUMENTATION: Flange-encased Rod VM#: 20120 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBCL89 LATITUDE: 30° 26.7' N ( 30.44536) LONGITUDE: 88° 6.9' W ( -88.11525) The primary bench mark is a deep-driven rod driven 87 ft (26.5 m) to refusal, located near the northeast foot of the east fowl river brige in a grassy slope next to bridge. 13.5 m (44.3 ft) east of the white line of state road 193, 15.0 m (49.2 ft) south of the centerline of paved road to marina, 14.10 m (46.3 ft) west of the center of a concrete culvert, 20.35 m (66.8 ft) northwest of a pile of rock next to the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5523 D 2011 DESIGNATION: 873 5523 D MONUMENTATION: Tidal Station disk VM#: 20107 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete road OPUS PID: LATITUDE: 30° 26.6' N ( 30.44411) LONGITUDE: 88° 6.9' W ( -88.11433) The bench mark is a disk set in the concrete roadway on the southwest side near the crest of the bridge, on the apron of the south bound land of the 193 bridge (east fowl river), 145.78 m (478.3 ft) east-southeast of the north end of the bridge, 6.43 m (21.1 ft) southwest of the centerline of the highway, 0.71 m (2.3 ft) northeast of the west side of the bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) T I D A L B E N C H M A R K S BENCH MARK STAMPING: AL 17 DESIGNATION: AL 17 MONUMENTATION: Survey disk VM#: 20108 AGENCY: US Army Corps of Engineers (USE) IDB PID: SETTING CLASSIFICATION: Aluminum rod OPUS PID: LATITUDE: 30° 26.7' N ( 30.44525) LONGITUDE: 88° 6.8' W ( -88.11381) The bench mark is a rod set in the parking lot of the peligan reef parking lot next to a lite pole #5-00879, 14.80 m (48.6 ft) NE of the NW corner of the fuel containment wall, 11.31 m (37.1 ft) WSW of the centerline of the road leading to a boat ramp, 0.66 m (2.2 ft) west of the lite pole, flush with the concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) T I D A L B E N C H M A R K S BENCH MARK STAMPING: AL 17B DESIGNATION: AL 17B MONUMENTATION: Survey disk VM#: 20109 AGENCY: US Army Corps of Engineers (USE) IDB PID: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: BBFW22 LATITUDE: 30° 26.7' N ( 30.44497) LONGITUDE: 88° 6.8' W ( -88.11400) The bench mark is a disk set in the concrete walkway leading to the fuel dock store next to the boat ramp, 9.17 m (30.1 ft) southwest of the southwest corner of the fuel storage container wall, 4.65 m (15.3 ft) northwest of the centerline of the boat ramp, 3.40 m (11.2 ft) east of the northeast corner of the fuel store. BENCH MARK STAMPING: 5523 A 2011 DESIGNATION: 873 5523 A MONUMENTATION: Tidal Station disk VM#: 20118 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 30° 26.7' N ( 30.44489) LONGITUDE: 88° 6.8' W ( -88.11331) The bench mark is a disk set in the concrete bulkhead at beginnning of pier next to restauraunt. 7.4 m (24.3 ft) northeast of a chain link fence, 2.79 m (9.2 ft) southeast of the northeast corner of a wood building, 17.67 m (58.0 ft) north-northwest of the south end of the pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5523 B 2011 DESIGNATION: 873 5523 B MONUMENTATION: Tidal Station disk VM#: 20119 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete drain OPUS PID#: BBFW23 LATITUDE: 30° 26.7' N ( 30.44572) LONGITUDE: 88° 6.9' W ( -88.11431) The bench mark is a disk set in a concrete drain in the southwest corner of a parking lot for the pelican reef restaurant and boat ramp, 7.33 m (24.0 ft) west of the centerline of road leading into restaurant, 10.34 m (33.9 ft) south of a manhole cover, 26.88 m (88.2 ft) northwest of the center of a metal gate.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) T I D A L D A T U M S Tidal datums at STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER based on: LENGTH OF SERIES: 7 YEARS TIME PERIOD: August 2011 - July 2018 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8735180 DAUPHIN ISLAND, MOBILE BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/08/2017) = 1.618 MEAN HIGHER HIGH WATER MHHW = 0.447 MEAN HIGH WATER MHW = 0.431 MEAN TIDE LEVEL MTL = 0.225 MEAN SEA LEVEL MSL = 0.221 North American Vertical Datum NAVD88 = 0.197 MEAN LOW WATER MLW = 0.019 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/17/2018) = -0.548 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5523 C 2011 5.890 5.459 5523 D 2011 14.676 14.245 AL 17 1.903 1.472 AL 17B 0.881 0.450 5523 A 2011 1.365 0.934 5523 B 2011 3.211 2.780
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8735523 PUBLICATION DATE: 11/12/2020 Name: STATE HIGHWAY 193 BRIDGE, E. FOWL RIVER AL NOAA Chart: 11376 Latitude: 30° 26.6' N ( 30.44361) USGS Quad: BELLE-FONTAINE Longitude: 88° 6.8' W ( -88.11389) 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.