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Commercially Navigable Waterway (CNW) Data

The data set representing Commercially Navigable Waterways are derived from the Pipeline Integrity Management in High Consequence Areas rulemaking (IMP Rulemaking).

PHMSA conducted a review of available data sources in December 2021 and confirmed that no changes are available. Version 5 is still the most up to date CNW dataset available from the NPMS. The next review is planned for December 2023.

The commercially navigable waterway data is derived from the US Army Corps of Engineers’ National Waterway Network database (NWN), excluding all non-commercial routes designated as no-traffic, non-navigable, and/or for special vessels such as fishing, power, and recreational boats.

Version 5 (Derived from 6/26/2019 NWN data)

Scale: Variable - see metadata.
Installation: Esri shapefiles can be used with numerous GIS applications.
Size: 1.3 MB
Posted: November 2019

Version 4 (Derived from 3/27/2017 NWN data)

Scale: Variable - see metadata.
Installation: Esri shapefiles can be used with numerous GIS applications.
Size: 1.2 MB
Posted: Summer 2017

Version 3 (Derived from 2011 BTS data)

Scale: Variable - see metadata.
Installation: Esri shapefiles can be used with numerous GIS applications.
Size: 1 MB
Posted: Spring 2012

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The National Pipeline Mapping System contains information about hazardous liquid and gas transmission pipelines under the jurisdiction of US DOT PHMSA.
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