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Stayton-based Slayden Construction Group has been purchased by a global construction firm. MWH Constructors, a subsidiary of MWH Global, confirmed its latest acquisition Friday, though the deal became effective Jan. 1.

鈥淲hile the deal was effective on the first of the year, we wanted to ensure communication was given to all clients and internal operating groups before sharing the news externally,鈥� MWH spokeswoman Faithe Gorman-Smith wrote to the Daily Journal of Commerce. 鈥淲e are formally distributing the announcement this week.鈥�

Slayden and its 140 employees will move forward as 鈥�Slayden Constructors Inc.鈥� Additional sale terms were not disclosed.

Slayden had $67 million in gross billings in the Portland area in 2013, the last year for which figures are available. The company was founded in 1984 and has since tackled work in a variety of sectors ranging from heavy civil to environmental. However, in recent years it has focused primarily on environmental projects 鈥� specifically dam removal, fish ladders and hatcheries, and public water and wastewater projects.

Slayden and Arizona-based Sundt are teaming up to handle general contractor duties for the $307.5 million project to replace the Sellwood Bridge. The Slayden/Sundt joint venture in January 2015 filed suit against that project’s owner, Multnomah County, for allegedly providing inaccurate information resulting in cost overruns totaling $10 million.

MWH is an offshoot of MWH Global, a Broomfield, Colo.-based environmental consultancy group with around 1,000 employees based in the U.S. and 630 in the United Kingdom.