From the DNR:
The new temporary Deam Lake Trailhead is located on the eastside of the dam on Wilson Switch Road. Look for the Deam Lake Trailhead sign. Note, the first quarter-mile of the KT is shared with a horse trail. Click here for a map of the reroute. Note that the new Knobstone Trail map shows the southernmost Knobstone trail head at the Buzzard’s Roost shelter near the dam at Deam Lake. This trail head has not been built yet.