Knife River Corporation has added to its growing footprint in the US with the acquisition of Donaldson Brothers Ready Mix Inc.’s assets.
The move marks Knife River’s third regional acquisition in 2026 and reflects a continued emphasis on securing long‑term aggregate reserves in growth markets.
Donaldson Brothers serves the Bitterroot Valley, a region south of Missoula that has seen steady construction activity and population growth. The business brings three aggregate sources with more than 30 years of available supply, along with a ready‑mix plant and a precast concrete operation. For Knife River, the acquisition provides both materials security and an entry point into a new Montana market where demand for construction materials is expected to remain strong.
The deal follows Knife River’s January acquisition of Sparrow Enterprises Inc. in Helena and its purchase of Morgan Asphalt Inc. in Salt Lake City last month. The transactions have seen Knife River expand its operations which anchored by reliable aggregate reserves across key US markets.
Knife River president and chief executive officer Brian Gray said the company’s recent activity in the Mountain Segment aligns with its long‑term growth strategy.
“These three acquisitions in the Mountain Segment support our strategy of targeting aggregates-based, vertically integrated opportunities in mid-size, higher-growth markets,” he said. Gray said that the Donaldson assets “provide strategic aggregate reserves in western Montana while establishing a foothold in a new market,” positioning the company to support continued development in the state.
