* Surveys shown are the most recent available. For information regarding previous surveys, see contact information below.

Hydrographic surveys are in New England System's Microstation DGN format. To view you must have CADD software capable of reading this format. Click on the self extracting ZIP file below and save to your hard drive. Open the survey in your CADD or Bentley Viewer software.

XYZ Data

Hydrographic Surveys are in PDF format.

Channel Condition Reports are in PDF format.