HELENA, Mont. (AP) – Communities bordering Yellowstone National Park are isolated and tourists stranded after record floodwaters knocked out roads and bridges in Wyoming and Montana and forced the closure of all entrances to the park. There were no immediate reports of injuries and water levels were dropping Tuesday but it was unclear when the park could reopen. National Park Service photos showed a landslide, washed-out bridges and roads undercut by floodwaters. Roads through the park’s northern entrance are washed out and hundreds of tourists remained stuck in and around the town of Gardiner. The flooding triggered evacuations in the park and several Montana towns. (Photo: ABC News)