U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) To reach the tidal bench marks from I-10 heading east, take exit 29, Lakeshore Drive/Downtown, follow Lakeshore Drive which leads directly to the Civic Center, then turn west on Bord du Lac Drive and follow it around to the SE area of the Civic Center property. The bench marks are in the vicinity of the waterfront, Bord du Lac Drive, and North Lakeshore Drive. The tide gauge was located on a small dock near the SE corner of Lake Charles. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: A 269 1972 DESIGNATION: A 269 MONUMENTATION: Bench Mark disk VM#: 16850 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BK1489 SETTING CLASSIFICATION: Flood wall OPUS PID#: BK1489 LATITUDE: 30° 13.4' N ( 30.22406) LONGITUDE: 93° 13.3' W ( -93.22142) The primary bench mark is a disk set in the top of a concrete flood wall supporting a pipe guard rail located 42.4 m (139.10 ft) west of the center of Lake Shore Drive, 31.40 m (103.0 ft) south of the center of west Clarence Street, 0.60 m (2.0 ft) west of the east end of the flood wall, 0.12 m (0.39 ft) north of the pipe railing and about level with the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: H 1 1918 19.672 DESIGNATION: H 1 MONUMENTATION: Bench Mark disk VM#: 16851 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BK1488 SETTING CLASSIFICATION: Building wall OPUS PID: LATITUDE: 30° 13.6' N ( 30.22647) LONGITUDE: 93° 13.1' W ( -93.21833) The bench mark is a disk set vertically in the north brick wall of the old courthouse located in the SW corner of the intersection of Kirby and Ryan Streets, 24.2 m (79.4 ft) south of the south curb of Kirby Street, 0.4 m (1.31 ft) west of the NE corner of the courthouse, and about 0.9 m (2.95 ft) above the level of the street. BENCH MARK STAMPING: 4 1955 DESIGNATION: 876 7816 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 16852 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BK1491 SETTING CLASSIFICATION: Walkway OPUS PID: LATITUDE: 30° 13.4' N ( 30.22364) LONGITUDE: 93° 13.3' W ( -93.22128) The bench mark is a disk set in the top of the south end of the west concrete walkway of a bridge over a canal 45.75 m (150.10 ft) SE of bench mark A 269, 4.72 m (15.49 ft) west of the center of the highway, 0.6 m (1.968 ft) east of the south end of the west guard rail, 0.27 m (0.89 ft) north of the south end of the walkway, and about 0.3 m (0.98 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 5 1973 DESIGNATION: 876 7816 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 16853 AGENCY: National Ocean Survey/service (NOS) IDB PID#: BK2269 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 30° 13.4' N ( 30.22378) LONGITUDE: 93° 13.3' W ( -93.22119) The bench mark is a disk set in the top of the west end of the north retaining wall of a bridge over a canal, 6.40 m (21.00 ft) west of the centerline of Front Street and 0.43 m (1.41 ft) west of the NW corner of a concrete guard rail, and 0.30 m (0.98 ft) above the road. BENCH MARK STAMPING: BM NO 7 1988 DESIGNATION: 876 7816 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 16854 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID#: BBFY03 LATITUDE: 30° 13.5' N ( 30.22461) LONGITUDE: 93° 13.4' W ( -93.22258) The bench mark is a disk set flush in the southern section of the Civic Center Park, 207.20 m (679.79 ft) west of the intersection of Lakeshore Drive and Bord Du Lac Drive, 17.68 m (58.01 ft) south of the south curb of the public parking area, 9.75 m (31.99 ft) SW of an electrical box, 2.13 m (6.988 ft) west of the centerline of the wooden walkway leading to the pier, and 0.38 m (1.25 ft) north of the south face of a concrete bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: CIVL DESIGNATION: 876 7816 CIVL MONUMENTATION: Survey disk VM#: 17165 AGENCY: IDB PID: SETTING CLASSIFICATION: Unspecified deep rod OPUS PID: LATITUDE: 30° 13.6' N ( 30.22617) LONGITUDE: 93° 13.4' W ( -93.22347) The bench mark is a disk set flush with the ground surface, 19.45 m (63.81 ft) west of the center of Bord Du Lac Drive, 4.65 m (15.26 ft) west of the NW corner of a sidewalk around a parking area, 3.15 m (10.33 ft) NNE of an unmarked light pole and a fiberglass witness post, 3.22 m (10.56 ft) east of the east edge of the sea wall sidewalk. The bench mark is a 2-inch diameter aluminum disk, crimped to a metal rod driven 10 m (32 ft) and encased in PVC. The sidewalk nearby is painted with "GPS" and an arrow pointing towards it.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: G 1 1918 19.754 DESIGNATION: G 1 MONUMENTATION: Bench Mark disk VM#: 18214 AGENCY: U. S. Coast and Geodetic Survey (USC&GS) IDB PID#: BK1400 SETTING CLASSIFICATION: Building OPUS PID: LATITUDE: 30° 13.8' N ( 30.22922) LONGITUDE: 93° 12.9' W ( -93.21422) The bench mark is a disk set vertically in the NW corner of an abandoned three story building (501 Broad Street) at the NE quadrant of the intersection of Hodges and Broad Streets, 19.82 m (65.03 ft) north of the north curb of Broad Street, 2.37 m (7.78 ft) east of the east curb of Hodges Street, 0.96 m (3.15 ft) south of the NW corner of the building, and 1.2 m (3.9 ft) above the level of the street. BENCH MARK STAMPING: 7816 A 2008 DESIGNATION: 876 7816 A MONUMENTATION: Flange-encased Rod VM#: 19001 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBFY10 LATITUDE: 30° 13.4' N ( 30.22317) LONGITUDE: 93° 13.3' W ( -93.22181) The bench mark is a flange-encased rod located 51.8 m (169.9 ft) SW of the SE corner of the Pithon Cooulee gravity drainage pump house, 15.50 m (50.8 ft) NNW of the NE corner of the concrete retaining wall located on the SE side of Lakeshore Drive, 14.0 m (45.9 ft) SW of posted 35 mph speed limit sign, 8.4 m (27.6 ft) from the centerline of Lakeshore Drive. The datum point being the top of a stainless steel rod driven 14.6 m (47.9 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: H 1 MONUMENTATION: See descriptive text VM#: 19514 AGENCY: IDB PID: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 30° 13.6' N ( 30.22610) LONGITUDE: 93° 13.1' W ( -93.21810)
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) T I D A L D A T U M S Tidal datums at LAKE CHARLES, CALCASIEU RIVER based on: LENGTH OF SERIES: 11 YEARS TIME PERIOD: 3/07-2/08, 2/09-1/10, 3/10-2/19 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8770570 SABINE PASS NORTH Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (08/30/2017) = 1.499 MEAN HIGHER HIGH WATER MHHW = 0.428 MEAN HIGH WATER MHW = 0.397 MEAN SEA LEVEL MSL = 0.240 MEAN TIDE LEVEL MTL = 0.237 North American Vertical Datum NAVD88 = 0.204 MEAN LOW WATER MLW = 0.078 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/02/2008) = -0.893 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW A 269 1972 1.957 1.560 H 1 1918 19.672 5.565 5.168 4 1955 2.621 2.224 NO 5 1973 2.732 2.335 BM NO 7 1988 1.902 1.505 CIVL 2.002 1.605 G 1 1918 19.754 5.571 5.174 7816 A 2008 2.911 2.514 H 1 5.567 5.170 Foot Notes: Bench mark ' H 1 1918 19.672' is based on one differential leveling connection and does not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8767816 PUBLICATION DATE: 10/15/2020 Name: LAKE CHARLES, CALCASIEU RIVER LA NOAA Chart: 11347 Latitude: 30° 13.4' N ( 30.22364) USGS Quad: CALCASIEU Longitude: 93° 13.3' W ( -93.22167) 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.