U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) From the intersection of Park Road 22 and TX HWY 361, head North on TX HWY 361 for 28.16 km (17.5 mi), then continue on S Alister St for 1.29 km (0.8 mi), then turn right onto E Cotter Ave for 36.88 m (121 ft), then turn left onto Trout St for 0.16 km (0.1 mi). From the Fisherman s Wharf in Port Aransas, a ride on the Jetty Boat ferry can be chartered to cross the Port Aransas shipping channel to San Jose Island. The station is a steel platform located on the South side of the Northern jetty in Port Aransas. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 877 5241 B 2016 DESIGNATION: 877 5241 B MONUMENTATION: Metal Rod VM#: 22255 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGG79 LATITUDE: 27° 50.4' N ( 27.84081) LONGITUDE: 97° 2.8' W ( -97.04689) The primary bench mark is located 94.5 m (310.0 ft) ESE from the center of the jetty boat pier ramp, 79.1 m (259.5 ft) ESE from benchmark USACE 35, and30.8 m (101.0 ft) NE from the center of the concrete jetty walkway, . The datum point is the top of a stainless steel rod, driven 18.3 m (60 ft) to refusal and encased in a 6 inch PVC pipe which extends .3 m (1 ft) above the ground with a concrete kickblock with a magnet in the concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 65+.97 DESIGNATION: USACE 1 MONUMENTATION: Bench Mark disk VM#: 22249 AGENCY: US Corp of Engineers (USACE) IDB PID: SETTING CLASSIFICATION: Concrete jetty OPUS PID: LATITUDE: 27° 50.2' N ( 27.83703) LONGITUDE: 97° 2.4' W ( -97.03936) The bench mark is a brass disk set in the top of the northern concrete jetty located 348.98 m (1144.94 ft) ESE of USACE 3, 55.31 m (181.45 ft) NW of the tide station.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: USACE 2 MONUMENTATION: Bench Mark disk VM#: 22250 AGENCY: US Corp of Engineers (USACE) IDB PID: SETTING CLASSIFICATION: Concrete Jetty OPUS PID: LATITUDE: 27° 50.3' N ( 27.83761) LONGITUDE: 97° 2.5' W ( -97.04111) The bench mark is a brass disk set on the north side of the jetties and located 224.30 m (735.9 ft) NW of the station platform, 184.50 m (608.5 ft) NW of USACE 1, and 169.80 m (557.1 ft) SE of USACE 3.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: USACE 4 MONUMENTATION: Bench Mark disk VM#: 22252 AGENCY: US Corp of Engineers (USACE) IDB PID: SETTING CLASSIFICATION: Concrete jetty OPUS PID: LATITUDE: 27° 50.3' N ( 27.83848) LONGITUDE: 97° 2.6' W ( -97.04396) The bench mark is a brass disk set on the north side of the jetties located 159.79 m (524.25 ft) ESE of USACE 5, 133.04 m (436.48 ft) WNW of USACE 3.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 45 DESIGNATION: USACE 5 MONUMENTATION: Bench Mark disk VM#: 22253 AGENCY: US Corp of Engineers (USACE) IDB PID: SETTING CLASSIFICATION: Concrete jetty OPUS PID: LATITUDE: 27° 50.3' N ( 27.83914) LONGITUDE: 97° 2.7' W ( -97.04542) The bench mark is a brass disk set on the north side of the jetties located 231.9 m (758.51 ft) SE of 877 5241 B, 159.79 m (524.25 ft) WNW of USACE 4.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: USACE 35 MONUMENTATION: Bench Mark disk VM#: 22254 AGENCY: US Corp of Engineers (USACE) IDB PID: SETTING CLASSIFICATION: Concrete jetty OPUS PID: LATITUDE: 27° 50.5' N ( 27.84106) LONGITUDE: 97° 2.9' W ( -97.04767) The bench mark is a brass disk set on the north side of the jetties located 80.00 m (262.46 ft) WNW of 877 5241 B, 57.74 m (289.43 ft) SE of 877 5241 C. BENCH MARK STAMPING: 877 5241 C 2016 DESIGNATION: 877 5241 C MONUMENTATION: Metal Rod VM#: 22256 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: OPUS PID#: BBGK17 LATITUDE: 27° 50.5' N ( 27.84150) LONGITUDE: 97° 2.9' W ( -97.04783) The bench mark is located 149.40 m (490.2 ft) SE of 877 5241 D, 120.50 m (395.3 ft) NW from 877 5241 B, and 26.7 m (87.6 ft) NE from the center of the concrete jetty. The datum point is the top of a stainless steel rod driven 23.2 m (76 ft) to refusal, encased in a 6 inch PVC pipe which extends 0.3 m (1 ft) above the ground with a concrete kickblock with a magnet in the concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 877 5241 D 2016 DESIGNATION: 877 5241 D MONUMENTATION: Metal Rod VM#: 22257 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 50.6' N ( 27.84258) LONGITUDE: 97° 2.9' W ( -97.04894) The bench mark is located 211.20 m (692.9 ft) SE of 877 5241 E, 149.50 m (490.5 ft) NW of 877 5241 C, and 41.30 m (135.5 ft) NE of the center of the concrete jetty walkway. The datum point is the top of a stainless steel rod driven 11.9 m (39 ft) to refusal encased in a 6 inch PVC pipe which extends 0.3 m (1 ft) above the ground with a concrete kickblock and with a magnet in the concrete. BENCH MARK STAMPING: 877 5241 E 2016 DESIGNATION: 877 5241 E MONUMENTATION: Metal Rod VM#: 22258 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 50.6' N ( 27.84381) LONGITUDE: 97° 3.0' W ( -97.05039) The bench mark is located 358.6 m (1176.5 ft) NW of 877 5241 C, 212.20 m (696.2 ft) NW of 877 5241 D, and 36.6 m (120.1 ft) NE from the center of the concrete jetty walkway. The datum point is the top of a stainless steel rod driven 25.6 m (84 ft) to refusal and encased in a 6 inch PVC pipe which extends 0.3 m (1 ft) above the ground with concrete kickblock with a magnet in the concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) T I D A L D A T U M S Tidal datums at ARANSAS, ARANSAS PASS based on: LENGTH OF SERIES: 3 YEARS TIME PERIOD: October 2017 - September 2020 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8775870 BOB HALL PIER, CORPUS CHRISTI Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (07/25/2020) = 1.334 MEAN HIGHER HIGH WATER MHHW = 0.418 MEAN HIGH WATER MHW = 0.402 MEAN SEA LEVEL MSL = 0.255 MEAN TIDE LEVEL MTL = 0.233 North American Vertical Datum NAVD88 = 0.198 MEAN LOW WATER MLW = 0.065 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/20/2019) = -0.442 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 877 5241 B 2016 2.658 2.256 65+.97 1.575 1.173 USACE 2 1.488 1.086 USACE 4 1.503 1.101 45 1.717 1.315 USACE 35 1.759 1.357 877 5241 C 2016 1.398 0.996 877 5241 D 2016 1.631 1.229 877 5241 E 2016 1.746 1.344
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 8775241 PUBLICATION DATE: 05/21/2021 Name: ARANSAS, ARANSAS PASS TX NOAA Chart: 11312 Latitude: 27° 50.2' N ( 27.83660) USGS Quad: PORT ARANSAS Longitude: 97° 2.3' W ( -97.03910) 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.