Atwater 20-meter Buoy

Latitude:              43.1 (43°6’0″ N)
Longitude:          -87.85 (87°51’0″ W)


NDBC Station 45013


The Atwater 20-meter buoy (ATW20) is located approximately 2km offshore of Milwaukee’s Atwater Beach in Lake Michigan. A two-point mooring system secures the buoy over sand and rock substrate in 20 meters (65.6 feet) of water. The solar powered CB-1500 coastal data buoy is equipped with a weather station, a wave sensor, water quality sensors that collect data every 30 min, a vertical string of water temperature sensors, a downward-looking acoustic doppler current profiler (ADCP), and a surface camera which collects snapshot images every 10 minutes.


Meteorological data collected include wind speed and direction, air temperature, relative humidity, pressure, and solar irradiance.  Hydrological data include surface temperature, conductivity, pH, dissolved oxygen, turbidity, chlorophyll, water temperature at 1m intervals down to 20m, easterly and northerly current speed/direction at 2m intervals down to 20m, and wave speed, direction, and height. This buoy has also been used as a platform to deploy dissolved oxygen monitoring probes provided by the EPA Great Lakes National Program Office.