U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8413801 PUBLICATION DATE: 04/21/2003 Name: ELLSWORTH, UNION RIVER MAINE NOAA Chart: 13312 Latitude: 44° 32.2' N USGS Quad: ELLSWORTH Longitude: 68° 25.4' W To reach the bench marks from the intersection of U.S. Route 1A and U.S. Route 1/State Route 172 in Ellsworth, proceed west on Route 1/172 for 0.3 km (0.2 mi) to State Route 230, then south on Route 230 for 0.6 km (0.4 mi) to the entrance of the Ellsworth Public Boat Access on the right. The bench marks are located at the boat access, and the tide gage is located on the north end of the northernmost crib. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3801 A 1999 DESIGNATION: 841 3801 A MONUMENTATION: Tidal Station disk VM#: 15909 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Flag foundation The primary bench mark is a disk set in the concrete base of a flag pole in the southern part of the parking area of the Public Boat Access, 32.65 m (107.1ft) south of the ramp leading to the fuel pier, 13.17 m (43.2 ft) NNW of the NE corner of the boat ramp, and 0.42 m (1.4 ft) east of the center of the flag pole. BENCH MARK STAMPING: 3801 B 1999 DESIGNATION: 841 3801 B MONUMENTATION: Tidal Station disk VM#: 15910 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Gazebo foundation The bench mark is a disk set in the foundation of an octagonol gazebo near the parking area of the Public Boat Access, 53.72 m (176.2 ft) north of the north curb of the parking area, 9.67 m (31.7 ft) NE of the west point of the gazebo, and 0.60 m (2.0 ft) SSW of the NE point of the gazebo.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8413801 PUBLICATION DATE: 04/21/2003 Name: ELLSWORTH, UNION RIVER MAINE NOAA Chart: 13312 Latitude: 44° 32.2' N USGS Quad: ELLSWORTH Longitude: 68° 25.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3801 C 1999 DESIGNATION: 841 3801 C MONUMENTATION: Tidal Station disk VM#: 15913 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Foundation of building The bench mark is a disk set in the building foundation at the rear of the Ellsworth Water Treatment Plant, 18.56 m (60.9 ft) NE of the NE corner of the red frame garage, 3.89 m (12.8 ft) NE of the SW corner of the sewage holding tank, and 3.30 m (10.8 ft) NE of the SE side of the garage door of the treatment plant rear entrance. BENCH MARK STAMPING: 3801 D 1999 DESIGNATION: 841 3801 D MONUMENTATION: Tidal Station disk VM#: 15914 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Loading dock The bench mark is a disk set in a small loading dock at the front of the Ellsworth Water Treatment Plant, 18.90 m (62.0 ft) ESE of the north corner of the treatment plant, 2.25 m (7.4 ft) north of the brick retaining wall, and 0.66 m (2.2 ft) SE of the SE wall of the plant.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8413801 PUBLICATION DATE: 04/21/2003 Name: ELLSWORTH, UNION RIVER MAINE NOAA Chart: 13312 Latitude: 44° 32.2' N USGS Quad: ELLSWORTH Longitude: 68° 25.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3801 E 1999 DESIGNATION: 841 3801 E MONUMENTATION: Tidal Station disk VM#: 15916 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete retaining wall The bench mark is a disk set in a concrete retaining wall on the property of the Dead River Company, 14.33 m (47.0 ft) south of the NE corner of the concrete spill tank, 11.63 m (38.2 ft) NW of the NW edge of the asphalt driveway of the water treatment plant, and 2.34 m (7.7 ft) SSW of the SW wall of the Dead River Company.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8413801 PUBLICATION DATE: 04/21/2003 Name: ELLSWORTH, UNION RIVER MAINE NOAA Chart: 13312 Latitude: 44° 32.2' N USGS Quad: ELLSWORTH Longitude: 68° 25.4' W T I D A L D A T U M S Tidal datums at ELLSWORTH, UNION RIVER based on: LENGTH OF SERIES: 3 Months TIME PERIOD: July 1999 - September 1999 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8413320 BAR HARBOR, FRENCHMAN BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER (MHHW) = 3.471 MEAN HIGH WATER (MHW) = 3.343 MEAN SEA LEVEL (MSL) = 1.738 MEAN TIDE LEVEL (MTL) = 1.728 MEAN LOW WATER (MLW) = 0.114 MEAN LOWER LOW WATER (MLLW) = 0.000 National Geodetic Vertical Datum (NGVD 29) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 3801 A 1999 4.804 1.461 3801 B 1999 5.557 2.214 3801 C 1999 6.105 2.762 3801 D 1999 8.425 5.082 3801 E 1999 5.781 2.438
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8413801 PUBLICATION DATE: 04/21/2003 Name: ELLSWORTH, UNION RIVER MAINE NOAA Chart: 13312 Latitude: 44° 32.2' N USGS Quad: ELLSWORTH Longitude: 68° 25.4' W 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 (NAVD 88). NGVD 29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD 29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD 88 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. NAVD 88 replaces NGVD 29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD 88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD 88 elevations. The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD 88 elevations listed for each bench mark in the NGS database.