HOUSTON (AP) — In a quest to help Harvey victims, Kelli Shofstall and her son set out on a 165-mile drive from Austin to Houston that led them through neighborhood after neighborhood where the streets were dry and no one seemed to need assistance.

It took more than a day of driving around, following outdated flood maps, before they found a water-filled road where they could ferry tenants to and from a marooned apartment complex using an inflatable yellow raft.

"My son and I joked that we sucked at relief efforts," Shofstall said. Christian Carr, 17, waded in his jeans into knee-deep water pull...