U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) To reach the tidal bench marks from gate number 8 of the U.S. Naval Academy, proceed SE on Bowyer Road over a bridge to McNair Road, continue NE on McNair Road to Santee Road, proceed on Santee Road for 0.5 km (0.3 mi) to Santee Basin. The bench marks are located within the U.S. Naval Academys grounds. The gage and staff are located on Santee Pier in the Oceanography Laboratory Building. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7 DESIGNATION: 857 5512 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 438 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HV0207 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 38° 59.0' N ( 38.98325) LONGITUDE: 76° 28.9' W ( -76.48167) The primary bench mark is a disk set in a concrete monument located near the northern corner of Luce Hall, 5.55 m (18.2 ft) SW of the edge of the sidewalk on the south side of Santee Road, 4.45 m (14.6 ft) NE of the NE edge of the sidewalk entrance to Luce Hall, 3.23 m (10.6 ft) NW of the ironwood (locust tree), 2.86 m (9.4 ft) SE of the SE corner of the concrete foundation for an oriental monument, and 0.15 m (0.5 ft) below ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2 1928 DESIGNATION: TIDAL 2 STA 80 MONUMENTATION: Tidal Station disk VM#: 441 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HV0206 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 38° 58.9' N ( 38.98214) LONGITUDE: 76° 29.1' W ( -76.48481) The bench mark is a disk set in a concrete monument along the north edge of Chambers Walk between Chauvenet Walk and Chapel Walk, 62 m (203 ft) SE of the centerline of Chapel Walk, 41 m (136 ft) SW of the centerline of Stribling Walk, 27.04 m (88.7 ft) east of a granite monument for the Judge Joseph Hopper Nicholson Memorial bronze plaque, 23 m (75 ft) NE of the NE lamp post, 21.06 m (69.1 ft) NW of the NW edge of Chauvenet Walk, 0.09 m (0.30 ft) NE of the NE edge of Chambers Walk, and 0.03 m (0.10 ft) below ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3 1928 DESIGNATION: TIDAL 3 STA 80 MONUMENTATION: Tidal Station disk VM#: 442 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HV0205 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 38° 59.0' N ( 38.98286) LONGITUDE: 76° 29.2' W ( -76.48592) The bench mark is a disk set in a concrete monument at the NE edge of Chambers Walk in an area bounded by Stribling Walk, Chauvenet Walk, Chapel Walk, and Maryland Avenue, 54 m (176 ft) south of the south corner of the Mecedonian monument, 18.11 m (59.4 ft) west of the center of a manhole cover, 17.87 m (58.6 ft) NNW of the NW face of a 3.55 m (11.6 ft) circumference tulip poplar tree, 0.22 m (0.7 ft) west of the edge of Chambers Walk, and 0.06 m (0.2 ft) below ground. BENCH MARK STAMPING: 5 1928 DESIGNATION: 857 5512 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 443 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HV0204 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 38° 58.9' N ( 38.98247) LONGITUDE: 76° 29.2' W ( -76.48631) The bench mark is a disk set in a concrete monument in an area bounded by Chauvenet Walk, Blake Road, Maryland Avenue and Chapel Walk, 42.55 m (139.6 ft) WNW of the west corner of the granite foundation for a monument which bears the letters HERNDON, 42 m (138 ft) SE of the SE curb of Maryland Avenue, 30.94 m (101.5 ft) SW of the SW edge of Chauvenet Walk, 19.96 m (65.5 ft) NE of the NE curb of Blake Road, and 13 m (44 ft) south of the south edge of an east-west brick walk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5510 A 1978 DESIGNATION: 857 5512 A MONUMENTATION: Tidal Station disk VM#: 444 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 38° 59.0' N ( 38.98256) LONGITUDE: 76° 28.8' W ( -76.48064) The bench mark is a disk located at the SE face of Luce Hall, 6.16 m (20.2 ft) SW of the east corner of Luce Hall, 4.36 m (14.3 ft) NE of the centerline of the SE entrance to Luce Hall, and 0.52 m (1.7 ft) SE of the SE wall of Luce Hall. The bench mark is 0.03 m (0.1 ft) below ground, crimped to a stainless steel rod driven 13 m (42 ft) to refusal, and encased in a 4-inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: 5510 B 1978 DESIGNATION: 857 5512 B TIDAL MONUMENTATION: Tidal Station disk VM#: 1409 AGENCY: National Ocean Survey (NOS) IDB PID#: AC6864 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 38° 59.0' N ( 38.98319) LONGITUDE: 76° 28.9' W ( -76.48156) The bench mark is a disk located at the NW face of Luce Hall, 6.92 m (22.7 ft) NE of the centerline of the NW entrance to Luce Hall, 3.57 m (11.7 ft) SW of the north corner of Luce Hall, and 0.43 m (1.4 ft) NW of the NW wall of Luce Hall. The bench mark is 3 cm (0.1 ft) below ground, crimped to a stainless steel rod driven 11.0 m (36 ft) to refusal, and encased in a 4-inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5510 D 1979 RESET DESIGNATION: 857 5512 D TIDAL RESET MONUMENTATION: Tidal Station disk VM#: 16271 AGENCY: National Ocean Survey (NOS) IDB PID#: AJ8035 SETTING CLASSIFICATION: Concrete bulkhead OPUS PID#: BBDJ75 LATITUDE: 38° 59.0' N ( 38.98328) LONGITUDE: 76° 28.7' W ( -76.47911) The bench mark is a disk set in the concrete bulkhead located at the east corner of Santee Pier near the Hendrix Oceanographic Lab, 13.65 m (44.8 ft) SE of the SE face of the foundation for a steel crane, 11.45 m (37.6 ft) NE of the NE face of a small wooden shed, and 0.15 m (0.5 ft) SW of the NE face of the bulkhead. BENCH MARK STAMPING: 5512 E 2006 DESIGNATION: 857 5512 E MONUMENTATION: Tidal Station disk VM#: 18169 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 38° 59.0' N ( 38.98400) LONGITUDE: 76° 28.8' W ( -76.48006) The bench mark is a disk set in the concrete bulkhead located at the north corner of the Santee Pier near the Hendrix Oceanographic Lab, 60.30 m (197.8 ft) NE of the NE corner of the foundation of the field mantainance building, 21.31 m (69.9 ft) E of the NE corner of the foundation of a green high voltage box (TS-74) next to the practice field, and 19.27 m (63.2 ft) NNW of the NW corner of the foundation of the cutter shed.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) T I D A L D A T U M S Tidal datums at U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY based on: LENGTH OF SERIES: 19 YEARS TIME PERIOD: January 1983 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/19/2003) = 2.183 MEAN HIGHER HIGH WATER MHHW = 0.438 MEAN HIGH WATER MHW = 0.364 North American Vertical Datum NAVD88 = 0.235 MEAN SEA LEVEL MSL = 0.219 MEAN TIDE LEVEL MTL = 0.215 MEAN LOW WATER MLW = 0.067 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/31/1962) = -1.194 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7 1.500 1.136 2 1928 6.119 5.755 3 1928 5.028 4.664 5 1928 6.716 6.352 5510 A 1978 1.690 1.326 5510 B 1978 1.723 1.359 5510 D 1979 RESET 1.641 1.277 5512 E 2006 1.980 1.616
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8575512 PUBLICATION DATE: 10/14/2011 Name: U.S. NAVAL ACADEMY, SEVERN R., CHES. BAY MD NOAA Chart: 12282 Latitude: 38° 59.0' N ( 38.98328) USGS Quad: ANNAPOLIS Longitude: 76° 28.9' W ( -76.48156) 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.