U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) To reach the tidal bench marks from the intersection of US Highway 1 and Knox Street in Thomaston, proceed 0.8 km (0.5 mi) south on Knox Street to the foot of the street at the waterfront, and the property of the Lyman and Morse Boatbuilding Company. The bench marks are located on the property and along the Maine Central Railroad. The tide gauge was located on the SW corner of the wooden bulkhead on the south side of Building 7 at the boat yard. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5709 B 2003 DESIGNATION: 841 5709 B MONUMENTATION: Tidal Station disk VM#: 17280 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Loading bay door sill OPUS PID: LATITUDE: 44° 4.4' N ( 44.07330) LONGITUDE: 69° 10.8' W ( -69.18000) The primary bench mark is a disk set in the concrete sill for a large overhead door (easternmost of three doors) on the north side of Building 3 (red aluminum siding) at the Lyman and Morse Boatbuilding Company, east of the railroad crossing of Knox street, 23.43 m (76.9 ft) ESE of the NW corner of Building 3, 5.50 m (18.0 ft) SW of the SW corner of the main office (Building 2), and 0.23 m (0.8 ft) WNW of the east edge of the overhead door. Handheld GPS: N 44d 04m 23.2s, W 069d 10m 47.2s
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5709 A 2003 DESIGNATION: 844 5709 A MONUMENTATION: Tidal Station disk VM#: 17122 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Loading bay door sill OPUS PID: LATITUDE: 44° 4.3' N ( 44.07170) LONGITUDE: 69° 10.8' W ( -69.18000) The bench mark is a disk set in the concrete sill for a large overhead door (middle and largest of three doors) on the north side of building 7 (gray shake siding) at the Lyman and Morse Boatbuilding Company, 33.00 m (108.3 ft) SE of the north end of the wooden retaining wall at the boat launch ramp, 32.22 m (105.7 ft) WSW of the southernmost utility pole at the boatyard, and 2.08 m (6.8 ft) ESE of the NW corner of the front middle section of the building. Handheld GPS: N 44d 04m 18.0s, W 069d 10m 50.6s
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 18 1933 56.119 DESIGNATION: A 18=TIDAL MARK MONUMENTATION: Tidal Station disk VM#: 17281 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: PE0883 SETTING CLASSIFICATION: Building OPUS PID: LATITUDE: 44° 4.4' N ( 44.07330) LONGITUDE: 69° 10.8' W ( -69.18000) The bench mark is a disk set vertically near the SE corner of a brick building housing the Thomaston Historical Society, 88 m (289 ft) east of Knox street, 3.37 m (11.1 ft) north of the north rail of the tracks, 0.32 m (1.0 ft) north of the SE corner of the building, and 0.44 m (1.4 ft) above the concrete foundation apron. Handheld GPS: N 44d 04m 24.3s, W 069d 10m 47.1s
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO. 4 1948 DESIGNATION: TIDAL 4 STA 40 MONUMENTATION: Tidal Station disk VM#: 17282 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: PE1066 SETTING CLASSIFICATION: Building foundation OPUS PID: LATITUDE: 44° 4.3' N ( 44.07170) LONGITUDE: 69° 10.8' W ( -69.18000) The bench mark is a disk set vertically in the west wall at the SW corner of the foundation for a blue-gray boat shed located east of Building 7 at the Lyman and Morse Boatbuilding Company, 43.10 m (141.4 ft) east of the east wall of Building 7, 0.14 m (0.5 ft) north of the SW corner, 1 m (3 ft) above the granite rip-rap, and 0.8 m (2.6 ft) below the clapboard siding of the building. Handheld GPS: N 44d 04m 17.1s, W 069d 10m 48.0s
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 5 1954 DESIGNATION: TIDAL 5 STA 40 MONUMENTATION: Tidal Station disk VM#: 17283 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: PE1064 SETTING CLASSIFICATION: Signal light base OPUS PID: LATITUDE: 44° 4.4' N ( 44.07330) LONGITUDE: 69° 10.8' W ( -69.18000) The bench mark is a disk set in the NE corner of an abandoned railroad sign base, near the entrance to the Lyman and Morse Boatbuilding Company property, 4.94 m (16.2 ft) west of the centerline of Knox Street, 2.78 m (9.1 ft) NNE of the north rail of the tracks, and 1.10 m (3.6 ft) south of railroad signal pole No. 365 820V. Handheld GPS: N 44d 04m 24.2s, W 069d 10m 51.1s
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) T I D A L D A T U M S Tidal datums at THOMASTON, ST GEORGE RIVER based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: July 2003 - September 2003 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8418150 PORTLAND, CASCO BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.000 MEAN HIGH WATER MHW = 2.875 MEAN SEA LEVEL MSL = 1.508 MEAN TIDE LEVEL MTL = 1.498 North American Vertical Datum NAVD88 = 1.358 MEAN LOW WATER MLW = 0.120 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5709 B 2003 16.927 14.052 5709 A 2003 4.169 1.294 A 18 1933 56.119 18.252 15.377 NO. 4 1948 4.496 1.621 NO 5 1954 18.119 15.244
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8415709 PUBLICATION DATE: 04/01/2004 Name: THOMASTON, ST GEORGE RIVER ME NOAA Chart: 13301 Latitude: 44° 4.3' N ( 44.07170) USGS Quad: THOMASTON Longitude: 69° 10.9' W ( -69.18170) 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.