Salinity Monitoring: Gulf of Mexico Coastal Ocean Observing System
http://ocean.tamu.edu/GCOOS/gcoos.htm

Freshwater Inflow and Salinity: Texas
http://www.tpwd.state.tx.us/landwater/water/conservation/freshwater_inflow
http://tx.water.usgs.gov

Freshwater Inflow and Salinity: Louisiana
http://www.mvn.usace.army.mil/eng/edhd/watercon.htm
http://la.water.usgs.gov

Freshwater Inflow and Salinity: Mississippi
http://www.dmr.state.ms.us/Fisheries/Hydrological/HydrologicalData.htm
http://ms.water.usgs.gov/

Freshwater Inflow and Salinity: Alabama
http://al.water.usgs.gov

Freshwater Inflow and Salinity: Florida
http://fl.water.usgs.gov