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July 7, 2020


Inland and Intracoastal Waterways: Primer and

Issues for Congress


The federal government improves and maintains a system
of 12,000 miles of inland and intracoastal waterways with
over 200 lock and dam chambers. This system facilitates
the interstate movement of commercial cargo by barge.
Commercial navigation on these waterways annually moves
over 500 million tons of commodities, including petroleum
products, farm inputs (e.g., fertilizer), coal, and grains
accounting for 4% to 5% of total commercial tonnage
shipped in the United States. High-value cargo in containers
rarely moves on the inland or intracoastal waterways.

Most of the waterways are rivers (e.g., Mississippi River
and its tributaries) or along coasts located in the central and
eastern half of the conterminous United States. Although
these waterways are a relatively small part of the nation's
freight transportation network, they are an important
transportation route in some regions. Other waterway
stakeholders include recreational boaters (the dominant
traffic on the Atlantic Intracoastal Waterway), entities that
have special equipment transport needs (e.g., nuclear power
facilities), and municipal water suppliers with water
withdrawals near locks and dams. Policy issues for
Congress include options for paying for inland and
intracoastal waterways work and the effectiveness of
investments for sustaining system reliability.


Each year, Congress appropriates funds for the U.S. Army
Corps of Engineers (USACE) to perform construction and
operations and maintenance (O&M) work on 12,000 miles
of the nation's waterways. For FY2020, Congress
appropriated $1.29 billion for this work, with $1.16 billion
coming from the general fund of the Treasury and $131
million from the Inland Waterways Trust Fund (IWTF) (see
Table 1). Congress typically approves the funding as part
of the discretionary spending provided in an Energy and
Water Development appropriations act but also has on
occasion authorized supplemental funding for waterways.
For more on USACE funding, see CRS In Focus IF11462,
Army Corps of Engineers: FY2021 Appropriations.

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Since 1986, Congress generally has required that waterway
construction and major rehabilitation be paid with 50% of
the funds coming from the general fund and 50% from the
IWTF. The IWTF receives collections from a fuel tax on
commercial vessels using the 11,000 miles of waterways
designated in law (Figure 1). In 2014, P.L. 113-121 made
the general fund the sole source for waterway rehabilitation


costing less than $20 million. Also, in 2014, P.L. 113-295
increased the fuel tax from $0.20 to $0.29 per gallon.

Table I. USACE Inland and Intracoastal Waterways
Spending
($ in millions)
     USACE
     Account          FY2019              FY2020

  Investigations        $14                $26
  Construction      $330, of which     $389, of which
                   $1 16 from IWTF    $131 from IWTF
 O&M                    $836               $815
 MR&T                   $68                $60
 Total                 $1,248             $1,290
 Source: CRS, based on 33 U.S.C. §2212 and USACE funding data.
 Notes: O&M = Operations and Maintenance. MR&T = Mississippi
 River & Tributaries account; pays for lower Mississippi River Basin
 channel stabilization, which supports barge navigation. Construction
 account funds new waterway construction and rehabilitation work.

 Figure I. Inland and Intracoastal Waterways Subject
to Federal Commercial Vessel Fuel Tax


Source: CRS based on USACE data and 33 U.S.C. § 1804.
Note: Alaska and Hawaii have no fuel-taxed waterways.

Since FY2014, Congress has reduced the IWTF-required
portion of funds for specific projects (e.g., 35% from IWTF
and 65% from the general fund for Chickamauga Lock, TN,
in FY2020), thereby increasing general fund outlays for
waterway improvements by more than $440 million over
the period from FY2014 through FY2020 (Figure 2). For
FY2020, the Administration estimated inland waterway tax


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