TREMPEALEAU, Wis. — State highway engineers switched gears and now plan to erect temporary bridging while new bridges are being built on the Trempealeau-Holmen route through Black River swamps. The revision replaces the original plan for a detour via Centerville – a 9-1/2 minute longer trip. The budget difference was not released by state engineers. The no-cost Centerville plan had sparked an uproar from Trempealeau-LaCrosse commuters and Trempealeau business owners.