U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) To reach the station from the intersection of State Highways 103 and 114 in Warren, proceed south on Route 114 for 3.7 km (2.3 mi) to the intersection with Gibson Road. Turn right and proceed west on Gibson Road for 1.0 km (0.6 mi) to its termination at Shore Road. Turn left on Shore Road and proceed 30 m (100 ft) south to the driveway to a waterfront park and pier operated by the Bristol Highlands Improvement Association (BHIA). The bench marks are located on the property of the BHIA and along the right-of-way of State Highway 114 both north and south of Gibson Road. The tide gauge is located on the west end of the fixed pier north of the driveway. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2154 E 1977 DESIGNATION: 845 2154 E 1977 MONUMENTATION: DB VM#: 2163 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID: LATITUDE: 41° 41.7' N ( 41.69581) LONGITUDE: 71° 17.5' W ( -71.29239) The bench mark is a disk set flush in top of the S end of a concrete seawall located within the grounds of the Bristol Highlands Improvement Association (BHIA) Park, 25 m (81 ft) SE of the centerline of the steps in the seawall which lead to the beach, 10 m (32 ft) N of the centerline of a boat ramp at the S end of the park, and 4.11 m (13.5 ft) SE of the junction of the NW-SE seawall and the north-south seawall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2154 A 1977 DESIGNATION: 845 2154 A 1977 MONUMENTATION: DB VM#: 2159 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID: LATITUDE: 41° 41.8' N ( 41.69619) LONGITUDE: 71° 17.5' W ( -71.29219) The bench mark is a disk set flush in top of the N end of a north-south concrete seawall located within the grounds of the Bristol Highlands Improvement Association (BHIA) Park, 35.20 m (115.5 ft) W of a 2 m (5 ft) high stone and cement column set in the fence along the E side of the park, 23.41 m (76.8 ft) SW of the SW corner of the park, and 19 m (61 ft) N of the centerline of the concrete steps in the seawall, which lead to the beach. BENCH MARK STAMPING: 2154 B 1977 DESIGNATION: 845 2154 B 1977 MONUMENTATION: DB VM#: 2160 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID: LATITUDE: 41° 41.8' N ( 41.69611) LONGITUDE: 71° 17.5' W ( -71.29219) The bench mark is a disk set flush in top of a north-south concrete seawall located within the grounds of the Bristol Highlands Improvement Association (BHIA) park, 37.95 m (124.5 ft) W of the centerline of the road paralleling the shoreline on the E side of the park, 8 m (25 ft) NW of the NW corner of a cement and wood pavilion in the center of BHIA Park, and 6 m (20 ft) north of the centerline of the concrete steps in the seawall, which lead to the beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2154 D 1977 DESIGNATION: 845 2154 D 1977 MONUMENTATION: DB VM#: 2162 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Massive retaining walls OPUS PID: LATITUDE: 41° 41.8' N ( 41.69592) LONGITUDE: 71° 17.5' W ( -71.29233) The bench mark is a disk located where the seawall begins to curve to the SW, set flush in top of a north-south concrete seawall located within the grounds of the Bristol Highlands Improvement Association (BHIA) park, 12 m (38 ft) S of the centerline of the steps leading to the beach, in the seawall, and 6.86 m (22.5 ft) SW of the SW corner of the pavilion in the center of the park. BENCH MARK STAMPING: 2154 G 2015 DESIGNATION: 845 2154 G MONUMENTATION: F VM#: 21434 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 41° 41.7' N ( 41.69561) LONGITUDE: 71° 17.5' W ( -71.29203) The primary bench mark is a flange encased rod set 32.86 m (107.8 ft) SE of the S corner of a wooden bench overlooking the ocean, 30.51 m (100.1 ft) SSW of a 1 ft (0.3 m) by 1 ft (0.3 m) by 3 ft (0.9 m) tall granite right-of-way marker, 16.45 m (54.0 ft) ENE of the face of a 30 inch (76 cm) diameter tree, 12.02 m (39.4 ft) NNW of the face of a 24 inch (61 cm) diameter tree and 11.82 m (38.8 ft) W of the W post of the private beach parking only sign. The datum point is set 4 cm (2 inches) below the ground, being the top of a stainless steel rod driven 3.9 m (12.8 ft) to refusal and encased in a 7-inch (18 cm) nos logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2154 F 2015 DESIGNATION: 845 2154 F MONUMENTATION: DB VM#: 21435 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: In a boulder OPUS PID: LATITUDE: 41° 41.8' N ( 41.69617) LONGITUDE: 71° 17.5' W ( -71.29186) The bench mark is a disk set in an embedded boulder 27.29 m (89.5 ft) ESE of a post for shower head E of the seawall, 18.40 m (60.4 ft) NNW of a light pole numbered 61 at NE corner of Gibson and shore roads, 16.49 m (54.1 ft) NE of the NE corner of a pavilion on a concrete slab, 13.99 m (45.9 ft) N of a utility pole numbered 61-1 and 12.72 m (41.7 ft) S of a 2.5 ft (0.8 m) by 2.5 ft (0.8 m) by 4 ft (1.2 m) tall stone post at the N end of a 3 ft (0.9 m) wood fence. BENCH MARK STAMPING: 2154 H 2015 DESIGNATION: 845 2154 H MONUMENTATION: F VM#: 21436 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDV58 LATITUDE: 41° 41.7' N ( 41.69575) LONGITUDE: 71° 17.4' W ( -71.29081) The bench mark is flange encased rod set on the E side of a sloping field S of Gibson road, 54.01 m (177.2 ft) N of a power pole numbered nec01, 31.85 m (104.5 ft) NW of a flagpole with a small cannon, 21.51 m (70.6 ft) SW of the face of a 34 inch (86 cm) diameter pine tree at the SE corner of ledge street and Gibson street, 19.10 m (62.7 ft) SSE of a power pole numbered neco31 and 5.70 m (18.7 ft) W of the centerline of ledge road. The datum point is set 7 cm (3 inches) below ground being the top of a stainless steel rod driven 5.4 m (17.7 ft) to refusal and encased in a 7 inch (18 cm) NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: ELEV BM NO 441 DESIGNATION: 441 MONUMENTATION: DB VM#: 21437 AGENCY: Rhode Island Burea of Public Roads IDB PID#: LW0562 SETTING CLASSIFICATION: Set into the top of a concrete monumentOPUS PID: LATITUDE: 41° 41.3' N ( 41.68822) LONGITUDE: 71° 16.8' W ( -71.27919) The bench mark is a brass disk set in a 1 ft (0.3 m) by 1 ft (0.3 m) square concrete post near the intersection with asylum road, 13.40 m (44.0 ft) S of utility pole 140, 11.64 m (38.2 ft) N of utility pole 141, 11.55 m (37.9 ft) N of the NE corner of the marble block corner of the wall along the sidewalk N of asylum road, 10.48 m (34.4 ft) W of the centerline of route 114, 0.31 m (1.0 ft) E of a 1.5 ft (0.5 m) tall and 2 ft (0.6 m) wide marble wall and set about 0.30 m (1.0 ft) higher than the ground. BENCH MARK STAMPING: ELEV BM NO 440 DESIGNATION: 440 MONUMENTATION: DB VM#: 21438 AGENCY: Rhode Island Burea of Public Roads IDB PID#: LW0561 SETTING CLASSIFICATION: Set into the top of a concrete monumentOPUS PID: LATITUDE: 41° 42.1' N ( 41.70244) LONGITUDE: 71° 16.8' W ( -71.28000) The bench mark is a brass disk set in a 1 ft (0.3 m) by 1 ft (0.3 m) square concrete post 20.19 m (66.2 ft) SE of power pole 34 on the N side of beach road, 18.70 m (61.4 ft) N of utility pole 85 on the W side of route 114, 13.09 m (42.9 ft) S of utility pole 35 on the NW corner of beach road and route 114, 4.14 m (13.6 ft) E of a stop sign on the S side of beach road, 2.39 m (7.8 ft) NW of a fire hydrant at the SW corner of beach road at route 114 and about 0.15 m (0.5 ft) higher than the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) T I D A L D A T U M S Tidal datums at BRISTOL HIGHLANDS, NARRAGENSETT BAY based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: April 2015 - August 2015 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8454000 PROVIDENCE, PROVIDENCE RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.381 MEAN HIGH WATER MHW = 1.308 North American Vertical Datum NAVD88 = 0.716 MEAN TIDE LEVEL MTL = 0.680 MEAN SEA LEVEL MSL = 0.634 MEAN LOW WATER MLW = 0.051 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 2154 E 1977 2.906 1.598 2154 A 1977 2.591 1.283 2154 B 1977 2.532 1.224 2154 D 1977 2.303 0.995 2154 G 2015 4.502 3.194 2154 F 2015 6.891 5.583 2154 H 2015 14.505 13.197 ELEV BM NO 441 18.143 16.835 ELEV BM NO 440 35.598 34.290
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8452154 PUBLICATION DATE: 01/14/2016 Name: BRISTOL HIGHLANDS, NARRAGENSETT BAY RI NOAA Chart: 13224 Latitude: 41° 41.8' N ( 41.69670) USGS Quad: Bristol Longitude: 71° 17.6' W ( -71.29330) 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.