A freak thunderstorm dumped up to 6 inches of rain and inundated a tiny Wyoming town, collapsing a bridge, damaging homes and businesses, and sending about a dozen people to higher ground. Another thunderstorm dumped more rain on the flooded area Thursday afternoon before Gov. Matt Mead was scheduled to arrive to tour the damage. In Lusk, population 1,500, floodwaters rushed down Main Street, swamping four blocks and shutting down the town’s water supply, said Niobrara County Emergency Management Coordinator James Santistevan.