U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) To reach the tide station from the intersection of US Route 1 and Maine Route 189 in Whiting ME, travel north 3.5 km (2.2 mi) on US Route 1 (River Road), turn right onto Tide Mill Road and proceed northeast for 0.48 km (0.3 mi) across a small bridge, turn right and proceed 0.28 km (0.2 mi) east to the beach in the wooded area at the base of the bluff on the end of Gravelly Point. The bench marks are located southeast of the bridge on both sides of the tidal stream. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: Unstamped C DESIGNATION: 841 0864 C MONUMENTATION: Bench Mark disk VM#: 19604 AGENCY: IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID#: BBBW07 LATITUDE: 44° 49.4' N ( 44.82253) LONGITUDE: 67° 9.3' W ( -67.15481) The primary bench mark is a disk set near the top of a bedrock outcropping which becomes an islet at extreme high water and forms the north side of the southeastern end of the stream channel SE of the Tide Mill Road bridge, 78.15 m (256.4 ft) SE of the centerline of Tide Mill Rd, 55.77 m (182.9 ft) SE of bench mark 841 0864 MAINE, 37.66 m (123.6 ft) ESE of bench mark 841 0864 B and 3.97 m (13.0 ft) north of the highest point of outcrop.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MAINE 1907 DESIGNATION: 841 0864 MAINE MONUMENTATION: Bench Mark disk VM#: 19605 AGENCY: IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 44° 49.3' N ( 44.82250) LONGITUDE: 67° 9.4' W ( -67.15594) The bench mark is a silver colored disk set in bedrock SE of Tide Mill Road just SW of the bridge on the edge of a pasture, 55.77 m (183.0 ft) NW of bench mark 841 0864 A, 12.25 m (40.2 ft) SE of the centerline of Tide Mill Road, and 11.54 m (37.9 ft) south of the lowest and southern most end of the sloped concrete bridge abutment. BENCH MARK STAMPING: 0864 A 2010 DESIGNATION: 841 0864 A MONUMENTATION: Bench Mark disk VM#: 19606 AGENCY: NOS (National Ocean Service) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 44° 49.3' N ( 44.82231) LONGITUDE: 67° 9.3' W ( -67.15533) The bench mark is a disk set flush in the bedrock outcrop that forms the southern side of the southeastern end of the stream channel SE of the Tide Mill Road bridge, 68.02 m (223.1 ft) SE of the centerline of Tide Mill Road, 55.05 m (180.6 ft) north of the northern end of a line of pine trees separating a pasture from the beach, and 8.34 m (27.4 ft) NW of the SE end of the bedrock outcrop.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Unstamped B DESIGNATION: 841 0864 B MONUMENTATION: Bench Mark disk VM#: 19607 AGENCY: IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 44° 49.4' N ( 44.82256) LONGITUDE: 67° 9.3' W ( -67.15528) The bench mark is a disk set in bedrock on the middle of three prominent bedrock high points on the north side of the stream channel SW of the Tide Mill Road bridge, 45.65 m (149.8 ft) SE of the centerline of Tide Mill rd, 32.39 m (106.3 ft) SSE of a 1.29 m X 0.25 m (4.2 ft x 0.8 ft) round mill stone set in the lawn SE of Tide Mill Rd, 2.47 m (8.1 ft) NE of the NE cliff like edge of the stream channel. BENCH MARK STAMPING: Unstamped D DESIGNATION: 841 0864 D MONUMENTATION: Bench Mark disk VM#: 19608 AGENCY: IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 44° 49.4' N ( 44.82383) LONGITUDE: 67° 9.1' W ( -67.15194) The bench mark is a disk set near the top of the first bedrock outcropping north of Gravelly Point along the beach of the eastern side of the point, 25.45 m (83.5 ft) west of where the mudflats of the cove to the north meet the gravel beach at low water, 18.65 m (61.2 ft) SSE of bench mark 841 0864 E, 5.20 m (17.1 ft) north of where the bedrock outcrop meets the gravel beach, 2.1 m (6.9 ft) east of the tree line, and 1.51 m (5.0 ft) above the gravel beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Unstamped E DESIGNATION: 841 0864 E MONUMENTATION: Bench Mark disk VM#: 19609 AGENCY: IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 44° 49.4' N ( 44.82394) LONGITUDE: 67° 9.1' W ( -67.15203) The bench mark is a disk set in bedrock near the tree line north of the gravel beach that forms the eastern side of Gravelly Point and around a slight bend to the NW of the bedrock shoreline, 56.5 m (185.4 ft) SSE of the northern edge of bedrock outcrop measured on the curve of the shoreline, 18.65 m (61.2 ft) NNW of bench mark 841 0864 D, and 0.51 m (1.7 ft) ENE of the tree line.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) T I D A L D A T U M S Tidal datums at GRAVELLY PT., WHITING BAY based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: May 2010 - October 2010 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8410140 EASTPORT, PASSAMAQUODDY BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 5.702 MEAN HIGH WATER MHW = 5.555 MEAN TIDE LEVEL MTL = 2.827 MEAN SEA LEVEL MSL = 2.827 MEAN LOW WATER MLW = 0.099 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW Unstamped C 7.368 1.813 MAINE 1907 8.746 3.191 0864 A 2010 6.241 0.686 Unstamped B 7.335 1.780 Unstamped D 6.634 1.079 Unstamped E 6.491 0.936
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8410864 PUBLICATION DATE: 11/19/2010 Name: GRAVELLY PT., WHITING BAY ME NOAA Chart: 13394 Latitude: 44° 49.4' N ( 44.82333) USGS Quad: WHITING Longitude: 67° 9.1' W ( -67.15167) 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.