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Inland Waterways Trust Fund


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Updated February 26, 2018


The Inland Waterways Trust Fund (IWTF) is a fund in the
U.S. Treasury that receives revenues from a tax (also
known as the inland waterway user fee) on commercial-
barge fuel on federally designated waterways.
Approximately 11,000 miles of the nation's 36,000 miles of
inland waterways are part of this system and subject to the
fuel tax (see Figure 1). Pursuant to the Water Resources
Development Act of 1986 (WRDA 1986; P.L. 99-662),
IWTF monies are subject to appropriation and used to
finance construction and major rehabilitation projects on
these waterways. IWTF funds are used to match federal
appropriations from the General Fund of the Treasury.
Overall, expenditures from the IWTF typically make up
5%-15% of total spending by the Army Corps of Engineers
(Corps) on federal inland waterways. Regular operations
and maintenance costs on these waterways, including
dredging and minor lock repairs, are funded entirely from
the General Fund.

The Water Resources Reform and Development Act of
2014 (WRRDA 2014; P.L. 113-121) authorized changes to
IWTF project planning and delivery, altered the cost-
sharing threshold for major rehabilitation projects, and
partially exempted one project (Olmsted Locks and Dam
Project, on the Ohio River) from IWTF cost sharing. That
same year, P.L. 113-295 included among its provisions an
increase to the inland waterway fuel tax. These changes
have stabilized the IWTF balance and allowed for an
overall increase in IWTF-related expenditures on inland
waterways (see Figure 2). This In Focus discusses the
IWTF, inland waterways, and related issues for Congress.

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Annual commercial traffic on the federal inland waterways
system (i.e., fuel-taxed waterways designated by Congress
and eligible for funding from the lWTF) accounts for 4%-
5% of total commercial tonnage shipped in the United
States. Although inland waterways are a relatively small
part of the nation's freight transportation network, they are
an important transportation route in some regions. In some
areas that rely on movement of bulk goods, the percentage
of commercial tonnage shipped by barge, especially for
specific commodities, is high. Along with freight rail,
inland waterways are a means of transport for the nation's
grain and oilseed exports and for bulk products such as
coal, petroleum, chemicals, processed metals, cement, sand,
and gravel.


Figure I. Federal Fuel-Taxed Inland Waterways


Source: CRS, based on Corps data.
Note: Alaska and Hawaii have no fuel-taxed waterways.

Whereas total freight tonnage for all other modes of
domestic shipping has increased in recent years, traffic and
tonnage on the inland waterways system has remained
relatively flat over the last 20 years. Future inland
waterways shipping is expected to increase, albeit at a rate
slower than other modes. A primary concern for many
commercial waterway users is the age of inland waterways
infrastructure and the potential for delays in shipping as this
infrastructure deteriorates. Some are concerned that these
delays could lead users to turn to other modes of freight
transit.


Congress established the inland waterways user fee in 1978.
WRDA 1986 formally established the system by which
these fees are utilized, including the IWTF and the current
system of financing inland waterways construction and
major rehabilitation projects. Costs for these projects are
shared equally between the IWTF and the General Fund,
whereas regular waterway operations and maintenance
costs are funded entirely from the General Fund. The IWTF
balance has varied considerably over time, reaching its
highest level in FY2002. Shortly thereafter, IWTF
appropriations increased significantly as the George W.
Bush Administration requested and Congress appropriated
greater investments in IWTF-funded projects. At the same
time, fuel tax receipts declined. As a result, the balance fell
sharply from FY2005 to FY2010 (see Figure 2).


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