SPRINGFIELD, Oregon — Roseboro plans to spend around $120 million to expand its manufacturing site in Springfield. Founded in Springfield in 1939, Rosboro claims to be the largest producer of glue-laminated timber products in North America. Now, the company said it will construct two new mills on its Springfield campus, and expand its timber-drying operation there. …Rosboro VP of Marketing and Strategic Development Brian Wells said the dry-kiln expansion is almost complete, and both of the new mills should be operational by the end of 2026. He said altogether, this could create up to 100 new union jobs. …In February of this year, Rosboro laid off 25 workers when it closed down its stud mill in Springfield. Wells said due to market conditions and government regulations, that facility was making a product that wasn’t profitable.