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Commercially Navigable Waterways (CNWs) are considered High Consequence Areas (HCA) as defined in <\/SPAN><\/SPAN>49 CFR § 195.450. <\/SPAN><\/SPAN> The CNW data is a subset of the National Waterway Network (NWN) as distributed by the US Army Corps of Engineers (available for download at https://usace.contentdm.oclc.org/digital/collection/p16021coll2/id/3799. Lines in the NWN with FUNC_CLASS equal to S, B, or D were extracted from the NWN and are considered by PHMSA to be commercially navigable. The data set covers the 48 contiguous states plus the District of Columbia, Hawaii, Alaska, Puerto Rico and water links between. The nominal scale of the dataset varies with the source material. The majority of the information is at 1:100,000 with larger scales used in harbor/bay/port areas and smaller scales used in open waters.<\/SPAN><\/SPAN><\/P>

HCAs are defined in 49 CFR § 195.450. This dataset is one resource available to assist operators with identifying locations that meet the regulatory definition of an HCA. If a location meets the regulatory definition of an HCA but it is not mapped in the HCA data currently available from PHMSA, that location is still an HCA. Operators must continually assess the locations in which their lines are located, to include reference to NPMS as one avenue to obtain data but not the sole avenue, to determine if they are in or could affect an HCA.<\/SPAN><\/P>

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