The Cuyuna Lakes State Trail had an at-grade crossing of TH 6 in the City of Crosby. The crossing on the heavily used trail in the Cuyuna Country State Recreation Area was dangerous for pedestrians. The City of Crosby partnered with the Minnesota DNR, MnDOT, and IRRRB to fund and construct a pedestrian tunnel separating pedestrian traffic from TH 6. Bolton & Menk provided plan development and construction assistance for the grade separation project. Snowmobilers and bikers now can enjoy a safe crossing of the busy TH 6 highway.