National Water Level Observation Network (NWLON) (NWLON)

Updated 2012-07-25

The NWLON is a network of long term stations whose fundamental purpose is to provide vertical control (tidal datums) that support a host of national requirements. In addition, the NWLON collects continuous water level data and provides observations and derived data products that support: marine transportation and navigation ( hydrographic charting surveys, shoreline mapping surveys, tide predictions, forecast water levels, real time observations, dredging projects, hazardous material spill response); global sea level rise studies, storm surge and tsunami detection and warnings, marine boundary determination (federal/state, state/private, state/state), coastal zone management activities, ecosystem restoration, and effective marine spatial planning. Main gaps: Gap analysis report completed in FY2008 identifying gaps based primarily on providing vertical (tidal datum) control. Largest gaps in Arctic region – gaps in data and information in Bristol Bay, Bering Sea, Bering Strait, Chukchi Sea, and Beaufort Sea areas.

Time frame

Project time span
1840 -
Data collection
1840 -
Data processing
1840 -
Data reporting
1840 -

Contact information

Contact person
- -
Manoj Samant

Parameters and Media

Parameter groups measured/observed/modelled
Media sampled/studied/modelled
Human media
Seawater/suspended particulate matter


Regions studied

Data availability

Samples/specimens archived in specimen banks?

Methods & Procedures

Procedures and methodology used for, e.g., sampling and sample storage, sample pretreatment, extraction and analysis, including which laboratories are involved, references to methods employed, etc.

Water Level Data, Water temperature, Meteorological Data (wind speed/direction, air temperature, barometric pressure).

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
Other institutes involved in the project

US National Oceanic and Atmospheric Administration (NOAA)

Is this project reporting to other organizations/programmes?

International Hydrographic Organization (IHO), Global Sea Level Observing System (GLOSS) (GLOSS)

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