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File Information

File Information

NOTE: Surveys shown are the most recent available. For information regarding previous surveys, contact the Navigation Section.

 Hydrographic surveys are in Bentley Microstation V8i DGN format. Click on the self extracting ZIP file below and save to your hard drive. Open the survey in your CADD Software Product or Bentley (Free) View software. See Bentley website to obtain free viewer.

NOTE: Hydrographic surveys without a DGN file were most recently processed through eHydro using ArcGIS software. More information about eHydro products can be found in this PowerPoint.

 XYZ Data – ASCII (space delimited) bathymetry sounding data, sorted for minimum depths for printing within a scale dependent plot.

 Hydrographic Surveys, Survey Results / Channel Condition Reports are in PDF format.

Meta Data text file image Metadata file.

New Hampshire Projects

The Corps has completed 10 navigation projects in New Hampshire that have improved rivers, harbors, and lakes used by commercial interests, fishermen, and the many recreational boaters that benefit from New Hampshire's coastal and inland waterways. Initial work on some of the projects dates back to the 19th century. However, most of the navigational work in today's rivers and harbors has been constructed by the Corps within the past 50 years, costing an aggregate $6.65 million. Below are the Corps' navigation projects in New Hampshire.
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 Back Channel / Sagamore Creek | Project Map
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
8/7/2013 
 Condition Survey
Complete Project Drawing
Meta Data text file image
 3/17/2017   After Dredge Survey
Supplemental Drawing
      Meta Data text file image 
 Bellamy River |Project Maps
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
9/05/2019
Condition Survey
Complete Project Drawing
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
7/22/2019
Condition Survey
Complete Project Drawing
 Exeter River
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
11/3/2021
Condition Survey
Complete Project Drawing
 Hampton Harbor | Project Map
Publication Date Project Title / Description PDF Drawings Survey Results DGN File XYZ File Metadata File
11//9/2017
Condition Survey
Complete Project Drawing
Meta Data text file image
 Isles of Shoals Harbor
Publication Date: 6/1/1967
Project Map:  
PDF Drawings:  
 Lake Winnipesauke
Publication Date: N/A
Project Map:  
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
8/29/2019
Condition Survey
Complete Project Drawing
 Little Harbor | Project Map
Publication Date Project Title / Description PDF Drawings Survey Results DGN File XYZ File Metadata File
11/26/2013
Condition Survey
Complet Project Drawing
Meta Data text file image
 Portsmouth Harbor and Piscataqua River | Project Map, |Channel Coordinates
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
3/08/2021
Condition Survey
Complete Project Drawing
Publication Date Project Title / Description PDF Drawings Survey Results XYZ File Metadata File
3/05/2021
After Dredge Survey
Complete Project Drawing