U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) To reach the tidal bench marks from the intersection of U.S. Route 1 and Main Street in Biddeford, proceed east for 0.5 mile (0.8 km) to Water Street, then east on Water Street for 0.2 mile (0.3 km) to Cleaves Street, then east on Cleaves Street for 0.1 mile (0.2 km) to Rumery's Boat Yard. The bench marks are in the boat yard, and along Clifford and Pool Streets. The tide gage and staff were in the NW corner of the boat yard. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8828 A 1991 DESIGNATION: 841 8828 A MONUMENTATION: Tidal Station disk VM#: 12013 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete retaining wall OPUS PID: LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0) The primary bench mark is a disk set in the center of the south retaining wall for the boat lift at Rumery's Boat Yard, 24.38 m (80.0 ft) ENE of the NE corner of the red brick main building, 11.58 m (38.0 ft) west of the north corner of a large grey corrugated metal building, 11.49 m (37.7 ft) SSW of the north corner of the west retaining wall of the boat lift, and level with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8828 B 1991 DESIGNATION: 841 8828 B MONUMENTATION: Tidal Station disk VM#: 12014 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0) The bench mark is a disk set in a bedrock outcropping on the south side of Clifford Street, 17.71 m (58.1 ft) west of utility pole NET&T #7.7 on the south side of the street, 14.69 m (48.2 ft) NNE of utility pole C&P Co #7.1 on the north side of the street at the east side of the driveway to #31 Clifford Street, and 7.83 m (25.7 ft) ESE of the SE corner of the house at #31 Clifford Street. BENCH MARK STAMPING: 8828 C 1991 DESIGNATION: 841 8828 C MONUMENTATION: Tidal Station disk VM#: 12015 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0) The bench mark is a disk set in the concrete bridge abutment on the south side of the Pool Street bridge over Westbrook Stream, 44.20 m (145.0 ft) NNW of utility pole NET&E #463045 on the north side of the entrance to the Parkside By The Falls development, 10.82 m (35.5 ft) WSW of the centerline of Pool Street, 4.30 m (14.1 ft) SSE of the north end of the abutment, and 1.74 m (5.7 ft) below the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: M 98 1943 DESIGNATION: M 98 MONUMENTATION: Bench Mark disk VM#: 12016 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: OC0241 SETTING CLASSIFICATION: Granite wall OPUS PID: LATITUDE: 43° 29.3' N ( 43.48830) LONGITUDE: 70° 26.9' W ( -70.44830) The bench mark is a disk set in the top of the granite stone wall at the entrance to 131 Pool Street, 20.18 m (66.2 ft) NW of AT&T power pole #21, 14.90 m (48.9 ft) north of the west stone pillar at the entrance to Clifford Park, 8.72 m (28.6 ft) east of AT&T power pole #22, 7.19 m (23.6 ft) north of the centerline of Pool Street, and 0.24 m (0.8 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: W 18 1941 36 DESIGNATION: W 18 USGS RESET MONUMENTATION: Survey disk VM#: 12017 AGENCY: Maine Highway Dept (MEHD) IDB PID#: OC0244 SETTING CLASSIFICATION: Granite wing wall OPUS PID: LATITUDE: 43° 29.1' N ( 43.48500) LONGITUDE: 70° 26.4' W ( -70.44000) The bench mark is a disk set in the granite wing wall on the north side of the Pool Street bridge over Westbrook stream, 12.86 m (42.2 ft) SE of the west end of a steel guard rail, 11.55 m (37.9 ft) east of the centerline of Pool Street, 0.43 m (1.4 ft) west of the east corner of the granite block, and 1 m (4 ft) below the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) T I D A L D A T U M S Tidal datums at BIDDEFORD, SACO RIVER based on: LENGTH OF SERIES: 3 Months TIME PERIOD: July 1991 - September 1991 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 = 2.998 MEAN HIGH WATER MHW = 2.862 MEAN SEA LEVEL MSL = 1.518 MEAN TIDE LEVEL MTL = 1.482 MEAN LOW WATER MLW = 0.102 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8828 A 1991 4.071 1.209 8828 B 1991 26.567 23.705 8828 C 1991 11.060 8.198 M 98 1943 36.345 33.483 W 18 1941 36 12.186 9.324
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8418828 PUBLICATION DATE: 04/21/2003 Name: BIDDEFORD, SACO RIVER ME NOAA Chart: 13286 Latitude: 43° 29.5' N ( 43.49170) USGS Quad: KENNEBUNKPORT Longitude: 70° 26.8' W ( -70.44670) 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.