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.