U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8455083 PUBLICATION DATE: 04/01/2004 Name: POINT JUDITH, HARBOR OF REFUGE RI NOAA Chart: 13219 Latitude: 41° 21.8' N ( 41.36330) USGS Quad: NARRAGANSETT PIER Longitude: 71° 29.4' W ( -71.49000) To reach the tidal bench marks from the intersection of State Highway 108 and Ocean Road in Point Judith, proceed 0.8 km (0.5 mi) south on Ocean Road, then bear right at a turn in the road and continue to the entrance of Breakwater Village, then turn left on a dirt drive after passing through the entrance gate and continue down the hill, through the trailer park, to the small boat basin. The bench marks are located in the vicinity of the boat basin and the eastern breakwater of the Harbor of Refuge. The tide gage is located at the SW corner of a breakwater on the east side of the small boat basin. The tide staff is located on a cluster of pilings just inside the mouth of the basin on the east side. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5083 D 1987 DESIGNATION: 845 5083 D TIDAL MONUMENTATION: Tidal Station disk VM#: 2212 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Granite Boulder OPUS PID: LATITUDE: 41° 21.8' N ( 41.36330) LONGITUDE: 71° 29.4' W ( -71.49000) The primary bench mark is a disk set in a large granite boulder on the south side of a small boat basin at Breakwater Village, 38 m (124 ft) WNW of power pole #4584, 12 m (41 ft) WSW of a three pile cluster at the SE corner of the boat basin, 3 m (10 ft) WSW of an abandoned steel pole base filled with concrete, 2 m (6 ft) SE of the easternmost of four abandoned dock pilings, 0.85 m (2.8 ft) east of the east edge of a wooden walkway leading to a floating dock, and 0.21m ( 0.7 ft) above the walkway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8455083 PUBLICATION DATE: 04/01/2004 Name: POINT JUDITH, HARBOR OF REFUGE RI NOAA Chart: 13219 Latitude: 41° 21.8' N ( 41.36330) USGS Quad: NARRAGANSETT PIER Longitude: 71° 29.4' W ( -71.49000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 7 1948 DESIGNATION: 845 5083 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 2210 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete head wall OPUS PID: LATITUDE: 41° 21.8' N ( 41.36330) LONGITUDE: 71° 29.4' W ( -71.49000) The bench mark is a disk set in the south end of a 2 m (6 ft) long concrete headwall on the west side of an abandoned gun emplacement which is located between the Point Judith Coast Guard Station and the eastern breakwater of the Harbor of Refuge, 39 m (128 ft) east of the center of a large rock on the beach, 31 m (101 ft) NW of the center of a concrete manhole structure on the beach, 0.12 m (0.4 ft) north of the south end of the head wall, and 0.61 m (2.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8455083 PUBLICATION DATE: 04/01/2004 Name: POINT JUDITH, HARBOR OF REFUGE RI NOAA Chart: 13219 Latitude: 41° 21.8' N ( 41.36330) USGS Quad: NARRAGANSETT PIER Longitude: 71° 29.4' W ( -71.49000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5083 E 1989 DESIGNATION: 845 5083 E TIDAL MONUMENTATION: Tidal Station disk VM#: 2213 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 41° 21.8' N ( 41.36330) LONGITUDE: 71° 29.4' W ( -71.49000) The bench mark is disk set along the NE shoulder of the gravel parking lot of the Camp Cronin Fishing Area off of Ocean Road, in line with the east face of the eastern breakwater of the Harbor of Refuge, 122 m (400 ft) NW of bench mark NO 7 1948, 56 m (185 ft) SE of the northernmost boulder of the group of boulders at the NW edge of the parking lot, 52 m (170 ft) NE of the shore end of the eastern breakwater, and 2.56 m( 8.4 ft) NE of the approximate edge of the parking lot. The bench mark is set 0.61 (2.0 ft) below the level of the parking lot, crimped to the top of a stainless steel rod driven 12.2 m (40 ft) to refusal and encased in a PVC pipe. BENCH MARK STAMPING: 5083 F 1989 DESIGNATION: 84505083 F TIDAL MONUMENTATION: Tidal Station disk VM#: 2214 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete manhole OPUS PID: LATITUDE: 41° 21.8' N ( 41.36330) LONGITUDE: 71° 29.4' W ( -71.49000) The bench mark is a disk set in the north corner of a concrete manhole at the NE side of an abandoned gun emplacement located between the Point Judith Coast Guard Station and the eastern breakwater of the Harbor or Refuge, 7.99 m (26.2 ft) SE of the center of the gravel road leading to the Camp Cronin Fishing Area, 1.04 m (3.4 ft) NW of the east corner of the manhole, and 0.30 m (1.0 ft) south of a NOS witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8455083 PUBLICATION DATE: 04/01/2004 Name: POINT JUDITH, HARBOR OF REFUGE RI NOAA Chart: 13219 Latitude: 41° 21.8' N ( 41.36330) USGS Quad: NARRAGANSETT PIER Longitude: 71° 29.4' W ( -71.49000) T I D A L D A T U M S Tidal datums at POINT JUDITH, HARBOR OF REFUGE based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: August 1987 - October 1987 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8452660 NEWPORT, NARRAGANSETT BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.030 MEAN HIGH WATER MHW = 0.953 MEAN TIDE LEVEL MTL = 0.496 MEAN SEA LEVEL MSL = 0.468 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5083 D 1987 2.029 1.076 NO 7 1948 5.273 4.320 5083 E 1989 4.310 3.357 5083 F 1989 5.881 4.928
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8455083 PUBLICATION DATE: 04/01/2004 Name: POINT JUDITH, HARBOR OF REFUGE RI NOAA Chart: 13219 Latitude: 41° 21.8' N ( 41.36330) USGS Quad: NARRAGANSETT PIER Longitude: 71° 29.4' W ( -71.49000) 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.