U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8417227 PUBLICATION DATE: 02/28/2006 Name: BATH, KENNEBEC RIVER ME NOAA Chart: 13293 Latitude: 43° 55.5' N ( 43.92500) USGS Quad: BATH Longitude: 69° 48.9' W ( -69.81500) In Bath, Maine from the intersection of US Route 1 and Washington Street, proceed 1.9 km (1.2 mi) east on Washington Street to 229 Washington Street the additional Maine Maritime Museum Deering pier and additional parking. The bench marks are located around the museum, the pier, and State Road 209. The tide gauge is located at the SE corner of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7227 C 2005 DESIGNATION: 841 7227 C MONUMENTATION: Tidal Station disk VM#: 17905 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 43° 53.6' N ( 43.89330) LONGITUDE: 69° 48.9' W ( -69.81500) The bench mark is set in a rock outcrop just west of Deering pier, 53.50 m (175.5 ft) WSW of the NW corner of Deering pier, 26.40 m (86.6 ft) west of the west edge of the Deering pier monument, and 6.61 m (21.7 ft) south of the centerline of the dirt road leading to the pier. BENCH MARK STAMPING: 7227 B 2005 DESIGNATION: 841 7227 B MONUMENTATION: Tidal Station disk VM#: 17906 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 43° 53.6' N ( 43.89330) LONGITUDE: 69° 49.0' W ( -69.81670) The bench mark is set in the NE corner of a concrete slab supporting an electric generator on the south side of the Maritime Museum, 21.00 m (68.9 ft) north of a light pole, 2.78 m (9.1 ft) SW of the SW corner of the wooden loading dock, and 0.16 m (0.5 ft) SW of the NE corner of the concrete slab.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8417227 PUBLICATION DATE: 02/28/2006 Name: BATH, KENNEBEC RIVER ME NOAA Chart: 13293 Latitude: 43° 55.5' N ( 43.92500) USGS Quad: BATH Longitude: 69° 48.9' W ( -69.81500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7227 A 2005 DESIGNATION: 841 7227 A MONUMENTATION: Tidal Station disk VM#: 17907 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 43° 53.6' N ( 43.89330) LONGITUDE: 69° 48.9' W ( -69.81500) The bench mark is set in a rock outcrop east of the main building of the Maritime Museum, 13.80 m (45.3 ft) east of the NE corner of the building, 7.22 m (23.7 ft) south of the south edge of a sidewalk, and 2.27 m (7.4 ft) SW of the SW corner of a white wooden building. BENCH MARK STAMPING: 7227 D 2005 DESIGNATION: 841 7227 D MONUMENTATION: Tidal Station disk VM#: 17908 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 43° 53.6' N ( 43.89330) LONGITUDE: 69° 49.0' W ( -69.81670) The bench mark is set in a rock outcrop on the north side of the main building of the Maritime Museum, 10.89 m (35.7 ft) NNW of the NW corner of the building, 2.64 m (8.7 ft) east of the edge of the curb on the entrance drive, and 0.57 m (1.9 ft) west of the SW corner of the Mould Loft (building 247).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8417227 PUBLICATION DATE: 02/28/2006 Name: BATH, KENNEBEC RIVER ME NOAA Chart: 13293 Latitude: 43° 55.5' N ( 43.92500) USGS Quad: BATH Longitude: 69° 48.9' W ( -69.81500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 97 1943 DESIGNATION: A 97 MONUMENTATION: Bench Mark disk VM#: 17909 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: OB0199 SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 43° 53.7' N ( 43.89500) LONGITUDE: 69° 49.2' W ( -69.82000) The bench mark is a disk set in a rock outcrop near the intersection of State Highway 209 and Marshall Street, 31.00 m (101.7 ft) SSW of the centerline of Mitchell Road, 24.40 m (80.1 ft) NW of the junction of Marshall Street, 8.72 m (28.6 ft) west of the centerline of State Highway 209, and 2.8 m (9.2 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8417227 PUBLICATION DATE: 02/28/2006 Name: BATH, KENNEBEC RIVER ME NOAA Chart: 13293 Latitude: 43° 55.5' N ( 43.92500) USGS Quad: BATH Longitude: 69° 48.9' W ( -69.81500) T I D A L D A T U M S Tidal datums at BATH, KENNEBEC RIVER based on: LENGTH OF SERIES: 38 Days TIME PERIOD: July 21, 2005 - August 27, 2005 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 = 2.261 MEAN HIGH WATER MHW = 2.157 MEAN SEA LEVEL MSL = 1.131 MEAN TIDE LEVEL MTL = 1.114 MEAN LOW WATER MLW = 0.072 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7227 C 2005 5.342 3.185 7227 B 2005 9.615 7.459 7227 A 2005 6.180 4.023 7227 D 2005 10.161 8.004 A 97 1943 27.581 25.424
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8417227 PUBLICATION DATE: 02/28/2006 Name: BATH, KENNEBEC RIVER ME NOAA Chart: 13293 Latitude: 43° 55.5' N ( 43.92500) USGS Quad: BATH Longitude: 69° 48.9' W ( -69.81500) 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.