A Lock Haven log boom, smaller than but otherwise similar to the Susquehanna Boom at Williamsport, was constructed in 1849. Large cribs of timbers weighted with tons of stone were arranged in the pool behind the Dunnstown Dam, named for a settlement on the shore opposite Lock Haven. The piers, about from one another, stretched in a line from the dam to a point upriver. Connected by timbers shackled together with iron yokes and rings, the piers anchored an enclosure into which the river current forced floating logs. Workers called "boom rats" sorted the captured logs, branded like cattle, for delivery to sawmills and other owners. Lock Haven became the lumber center of Clinton County and the site of many businesses related to forest products.