MEMPHIS, Tenn.—Photos taken by a Mississippi River kayaker about five years before a crack was found in the Interstate 40 bridge linking Tennessee and Arkansas appear to show the fracture that led transportation officials to close the span indefinitely last week. Arkansas transportation officials said they cannot confirm or refute what’s shown in the 2016 photos, which raise questions about how early the crack appeared. The I-40 bridge connecting Memphis and the Arkansas city of West Memphis was shut down May 11 after inspectors found a crack in one of two 900-foot (275-meter) horizontal steel beams that are critical for the bridge’s structural integrity. River barge traffic under the span was closed that day but reopened three days later. Road traffic has been rerouted to the nearby Interstate 55 bridge. Repairs to the heavily used, six-lane I-40 bridge are expected to begin this week, but a long-term fix could take …