(Reuters) - U.S. manufacturing activity hit a nearly 3-1/2-year high last month and construction spending rebounded strongly in July, signs the economy entered the third quarter on strong footing.
Tuesday's upbeat data added to reports on employment and housing that have suggested growth remains sturdy, despite a slowdown in consumer spending in recent months.
"Things continue to fall into place for our view that growth should accelerate in the year's back half," said Dan Greenhaus, chief strategist at BTIG in New York.
The Institute for Supply Management (ISM) said its index of national factory activity rose to 59.0 last month, the highest reading since March 2011, from 57.1 in July.
A reading above 50 indicates expansion in the manufacturing sector. Economists had expected a pullback to 56.8. August's reading was lifted by a surge in a gauge of new orders, which touched its highest level 10 years. Order backlogs and new export orders also rose.
U.S. manufacturers fared better in August than factories in Europe and Asia, which have been hurt more by escalating tensions in Ukraine and a patchy recovery in China.
The new orders index correlates closely with quarterly changes in gross domestic product. Carl Riccadonna, a senior economist at Deutsche Bank in New York, said the current level of new orders has historically been consistent with an annualized GDP growth pace of 4.4 percent.
Manufacturers were mostly upbeat in August, with business conditions described as improving, good, strong and robust. Furniture manufacturers said labor was becoming an issue.
The bullish manufacturing picture was corroborated by another factory survey. Financial data firm Markit said its U.S. manufacturing Purchasing Managers Index rose to 57.9, the highest level since April 2010, from 55.8 in July.
The dollar firmed against a basket of currencies on the data, while prices for U.S. Treasury debt fell. The industrial index .SPLRCI was flat, outperforming the broader stock market, which was down after a big rally in August.
The bright growth picture was underscored by a report from the Commerce Department that showed construction spending increased 1.8 percent in July to a 5-1/2-year high. It was the largest monthly gain since May 2012.
In addition, construction outlays for May and June were revised up, which left some economists expecting the government to raise its second-quarter GDP estimate by two-tenths of a percentage point to a 4.4 percent rate later this month.
Third-quarter growth estimates currently range as high as a 3.5 percent pace, and some economists say the run of relatively strong economic data, if sustained, could prompt an early interest rate increase from the Federal Reserve.
"We think that there will be a shift in forward guidance at the September policy meeting to a more neutral posture that would allow for a rate hike early in 2015," said John Ryding, chief economist at RDQ Economics in New York.
Construction spending in July was buoyed by a 3.4 percent jump in outlays for state and local government projects. That offset a 1.1 percent drop in spending by the federal government.
Private construction advanced 1.4 percent to its highest level since November 2008.