CARLTON — Larry Johnson, class of 1966, was among the alumni who returned to see Carlton High School for a final time June 25. The school is being decommissioned as the Carlton and Wrenshall districts consolidate. The building, part of which is 110 years old, is being offered to Carlton County for redevelopment. All Carlton and Wrenshall secondary students will attend the Wrenshall School, now known as Silver Creek Secondary School, in the fall.…