Construction spending fell 1.7% in March, the Commerce Department said Wednesday.
The decline brought outlays to $856.7 billion and followed a 1.5% rise in February, Commerce said.
Economists had forecast a 0.6% increase, Bloomberg News reported.
Government projects dropped by 4.1%, the biggest decline since March 2002, Bloomberg reported.
Revised figures showed construction spending in January dropped 4%, the biggest drop since records began in 1993, Bloomberg reported.
Private construction spending declined 0.6%, and spending on single-family homes rose 0.4%.
Construction spending can boost demand for trucking services because spending increases the number of shipments of goods and building materials.