URS Corp., a provider of engineering and construction services, furloughed about 3,000 employees, the most announced by a single federal contractor since the U.S. government’s partial shutdown began.The total includes employees idled by the closing of a government facility where they work or directives from U.S. officials to halt operations or cut staffing, San Francisco- based URS said Thursday in a statement. More employees may be furloughed if the impasses continues, URS said.“The government shutdown, the continuing effects of sequestration and uncertainty about the federal budget are all having negative impacts on URS and many other government contractors,” Chief Financial Officer H. Thomas Hicks said in the statement. “We hope the situation is resolved as soon as possible to avoid additional impact on our federal business and our employees.”URS’s pullback showed the spreading effect on private business from the partial closing of government operations that began Oct. 1 with furloughs for about 800,000 federal workers. Federal agencies award more than $500 billion a year, or a rough average of $1.4 billion a day, to tens of thousands of contractors.The company is the 14th biggest U.S. government contractor with $3.9 billion in prime, or direct, awards in the fiscal year that ended Sept. 30, 2012, according to data compiled by Bloomberg. It had more than 54,000 employees globally as of Jan. 25, according to regulatory filings.