CO-OPS station 8418150: PORTLAND, CASCO BAY
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Cite as: Center for Operational Oceanographic Products and Services (CO-OPS) (2007): CO-OPS 1-minute Tsunami Water Level Data. NOAA National Centers for Environmental Information. doi:10.7289/V59884XF. Accessed [date].
Quality-Controlled and De-Tided
Coastal Water Level Data (2008-01-01 to 2025-04-15)
Unassessed ("Preliminary")
Coastal Water Level Data (2025)
Comments
None
Datums (Epoch: 1983-2001)
| Datum | Description | Value [meters] |
|---|---|---|
| STND | Station Datum | 0.0 |
| MHHW | Mean Higher-High Water | 5.626 |
| MHW | Mean High Water | 5.493 |
| DTL | Mean Diurnal Tide Level | 4.117 |
| MTL | Mean Tide Level | 4.103 |
| MSL | Mean Sea Level | 4.113 |
| MLW | Mean Low Water | 2.712 |
| MLLW | Mean Lower-Low Water | 2.607 |
| GT | Great Diurnal Range | 3.019 |
| MN | Mean Range of Tide | 2.781 |
| DHQ | Mean Diurnal High Water Inequality | 0.133 |
| DLQ | Mean Diurnal Low Water Inequality | 0.105 |
| HWI | Greenwich High Water Interval (in hours) | 3.593 |
| LWI | Greenwich Low Water Interval (in hours) | 9.751 |
| NAVD88 | North American Vertical Datum of 1988 | 4.208 |
Station History
| Date | Notes |
|---|---|
| 1910-03-04 | NOAA NOS CO-OPS establishment of Station 8418150 in support of the NWLON |
| 2007-07-25 | Station 8418150 Sensor and DCP updated to receive 1 minute water level data |
Sensor History
| Date | Type | Make | Model | Serial No. |
|---|---|---|---|---|
| 2008-01-06 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | *70 |
| 2008-11-29 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 1384-4072 |
| 2010-01-23 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 1971-4241 |
| 2010-12-18 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 979-3256 |
| 2011-09-24 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 1904-4172 |
| 2012-10-06 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 0893-3173 |
| 2013-08-11 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 903-8183 |
| 2015-02-21 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 0983-4076 |
| 2016-09-15 | Acoustic Sensor | Aquatrak | NG-3000 Water Level Sensor | 2492-AQ0292 |
Our approach to data processing is described in this article.
Top plot: Dates and times of full and new moons acquired from the Astronomical Applications Department of the U.S. Naval Observatory.
Top plot: Dates and times of full and new moons acquired from the Astronomical Applications Department of the U.S. Naval Observatory.