TREMPEALEAU, Wis. – Structural engineers will close State Highway 35 beginning Monday, one lane at a time, to examine the footings of the Black River bridge on the seven-mile straight-away through swamps between Trempealeau and Holmen. Soil sampling is expected to take several weeks. The highway is a major commuting route into LaCrosse. The bridge is site of a recreational boat landing down to the Mississippi.