U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) From the intersection of Interstate 310 South and US Highway 90 West, proceed west on US Highway 90 for 4.8 km (3.0 mi) to the intersection of LA 306, take LA 306 South for 9.6 km (6.0 mi) to Bayou Gauche, LA. The tide gauge and benchmarks are in the vicinity of the Bayou Gauche Volunteer Fire Department Boat house. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2482 A 2003 DESIGNATION: 876 2482 A MONUMENTATION: Tidal Station disk VM#: 17092 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 47.3' N ( 29.78864) LONGITUDE: 90° 25.2' W ( -90.41986) The primary bench mark is a disk located 7.30 m (23.95 ft) SSW from the centerline of LA HWY 306, 6.85 m (22.47 ft) NNE from the NE corner of the boathouse, 1.81 m (5.94 ft) east of a power pole, and 0.84 m (2.76 ft) NE of a orange witness post, driven 25.1 m (82.3 ft) to refusal and encased in 5" PVC pipe with a concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 B 2003 DESIGNATION: 876 2482 B MONUMENTATION: Tidal Station disk VM#: 17093 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 47.3' N ( 29.78883) LONGITUDE: 90° 25.2' W ( -90.41958) The bench mark is tidal disk located 6.85 m (22.47 ft) NNE from the centerline of LA HWY 306, 6.05 m (19.85 ft) WSW from the SW corner of the residence at 3629, 1.50 m (4.92 ft) NNW of a power pole, and 0.45 m (1.48 ft) WSW from an orange withness post, driven 26.82 m (87.99 ft) to refusal and encased in 5" PVC pipe with a concrete kick block. BENCH MARK STAMPING: 2482 C 2003 DESIGNATION: 876 2482 C MONUMENTATION: Tidal Station disk VM#: 17094 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 47.4' N ( 29.78972) LONGITUDE: 90° 25.3' W ( -90.42144) The bench mark is a disk located 8.30 m (27.23 ft) west of the NW corner the porch at residence NO. 3571, 5.60 m (18.37 ft) NNE of the centerline of LA HWY 306, 0.60 m (1.97 ft) NNW of a power pole, and 0.45 m (1.48 ft) SSW from an orange withness post, driven 19.5 m (64.0 ft) to refusal and encased in 5" PVC pipe with a concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 D 2003 DESIGNATION: 876 2482 D MONUMENTATION: Tidal Station disk VM#: 17095 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bridge foundation OPUS PID#: BBFX45 LATITUDE: 29° 47.4' N ( 29.79039) LONGITUDE: 90° 25.4' W ( -90.42325) The bench mark is a disk set in a concrete bridge foundation located 10.40 m (34.12 ft) SSW from power pole #710, 5.75 m (18.86 ft) NE from the centerline of LA HWY 306, 0.55 m (1.80 ft) NNE from the NE corner of bridgewall footing, and 0.18 m (0.59 ft) SE from the NW side of bridge footing. BENCH MARK STAMPING: 2482 E 2003 DESIGNATION: 876 2482 E MONUMENTATION: Flange-encased Rod VM#: 17096 AGENCY: National Ocean Service (NOS) IDB PID#: DJ9385 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: DJ9385 LATITUDE: 29° 47.4' N ( 29.79061) LONGITUDE: 90° 25.4' W ( -90.42397) The bench mark is a flange-encased rod located 43.7 m (143.4 ft) ESE from Badeaux Lane, 28.5 m (93.5 ft) north of the NW corner of residence at #80, and 0.45 m (1.48 ft) north of a witness post, driven 20.7 m (67.9 ft) to refusal and encased in 5" PVC and has a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 G 2006 DESIGNATION: 876 2482 G MONUMENTATION: Tidal Station disk VM#: 18282 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Steel rod OPUS PID#: BBCN89 LATITUDE: 29° 47.3' N ( 29.78806) LONGITUDE: 90° 25.1' W ( -90.41803) The bench mark is a disk located along LA HWY 306, 78.94 m (258.99 ft) ESE of bench mark 876 2482 F, 17.06 m (55.97 ft) ESE of the mailbox at 3683 LA HWY 306, 22.55 m (73.98 ft) WNW of of mailbox at 3701 LA 306, 9.44 m (30.97 ft) SSE of the SE corner of the house at 3683 LA HWY 306, 4.57 m (14.99 ft) NE of center of LA 306, and 0.60 m (1.97 ft) WSW of witness post. The datum point is the top of a stainless steel rod driven 27.40 m (89.89 ft) to refusal, in a sleeve extending to a depth of 0.91 m (2.99 ft) and encased in a 5-inch PVC pipe with an aluminum cover and concrete kickblock. Note - sleeve depth does not meet the specifications for class A rod mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 H 2006 DESIGNATION: 876 2482 H MONUMENTATION: Tidal Station disk VM#: 18283 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Steel rod OPUS PID: LATITUDE: 29° 47.3' N ( 29.78817) LONGITUDE: 90° 25.0' W ( -90.41697) The bench mark is a disk located along LA HWY 306, 106.98 m (350.98 ft) SE of bench mark 876 2482 G, 12.49 m (40.98 ft) south of utility pole (no number) in front of 3727 LA HWY 306, 9.75 m (31.99 ft) NW of NW corner of dock across street from 3727 LA HWY 306, 21.94 m (71.98 ft) west of mailbox at 3727 LA HWY 306, 5.18 m (16.99 ft) south of center of LA HWY 306, and 0.60 m (1.97 ft) north of the witness post. The datum point is the top of a stainless steel rod driven 27.40 m (89.89 ft) to refusal, in a sleeve extending to a depth of 0.91 m (2.99 ft) and encased in a 5 -inch PVC pipe with an aluminum cover and concrete kickblock. Note - Sleeve depth does not meet the specifications for class A rod mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 K 2006 DESIGNATION: 876 2482 K MONUMENTATION: Tidal Station disk VM#: 18284 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Steel rod OPUS PID: LATITUDE: 29° 47.3' N ( 29.78753) LONGITUDE: 90° 24.9' W ( -90.41564) The bench mark is a disk located along LA HWY 306, 89.61 m (294.00 ft) east of bench mark 876 2482 H, 17.67 m (57.97 ft) NW of large split-trunk tree across street from 3755 LA HWY 306, 11.27 m (36.97 ft) SSE of the SE corner of the house at 3751 LA HWY 306, 7.62 m (25.00 ft) North of center of road, 1.21 m (3.97 ft) NNE of the witness post, and 0.91 m (2.99 ft) north of light pole (no number) in yard of 3751 LA HWY 306. The datum point is the top of a stainless steel rod driven 27.40 m (89.89 ft) to refusal, in a sleeve extending to a depth of 0.91 m (2.99 ft) and encased in a 5 -inch PVC pipe with an aluminum cover and concrete kickblock. Note - sleeve depth does not meet the specifications for class A rod mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2482 M 2016 DESIGNATION: 876 2482 M MONUMENTATION: Flange-encased Rod VM#: 22330 AGENCY: NOS IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 47.3' N ( 29.78750) LONGITUDE: 90° 24.9' W ( -90.41500) The bench mark is located along LA HWY 306, 30.4 m (99.7 ft) NW of a 5 cm (2 in) chlorinator regulator pipe sticking approximately 1 m (3.3 ft) above ground, 30.2 m (99.1 ft) east of telephone pole # P1013, 4.7 m (15.4 ft) north of centerline of Bayou Gauche Rd, 15 cm (6 in) west of a witness post, and is a stainless steel rod driven 27.1 m (88.8 ft) to substantial resistance, in a sleeve extending to a depth of 1 m (3.3 ft) and encased in a 13 cm (5 in) PVC pipe with an aluminum cover and concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) T I D A L D A T U M S Tidal datums at WEST BANK 1, BAYOU GAUCHE based on: LENGTH OF SERIES: 9 YEARS TIME PERIOD: June 2003 - August 2018 TIDAL EPOCH: 2012-2016 CONTROL TIDE STATION: 8761724 GRAND ISLE, EAST POINT Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS: MEAN SEA LEVEL MSL = 0.000 North American Vertical Datum NAVD88 = -0.145 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MSL 2482 A 2003 0.247 2482 B 2003 0.345 2482 C 2003 0.308 2482 D 2003 1.448 2482 E 2003 1.217 2482 G 2006 0.322 2482 H 2006 0.478 2482 K 2006 0.147 2482 M 2016 0.267 Foot Notes:
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 8762482 PUBLICATION DATE: 01/08/2021 Name: WEST BANK 1, BAYOU GAUCHE LA NOAA Chart: 11352 Latitude: 29° 47.3' N ( 29.78861) USGS Quad: DES ALLEMANDS Longitude: 90° 25.2' W ( -90.42028) 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.