That section of road in Yellowstone National Park temporarily closed just hours after opening for auto travel for the summer season will remain closed this week. Spokesman Al Nash explains that a basketball-sized pothole was discovered Friday afternoon south of Canyon Junction; but upon further inspection, park staff members discovered a large section of the roadbed beneath the pavement was washed out. Nash says this specific location has been has been a challenge for them each spring for many years due to the geology there. Nash says it will be some time before the crews can fully ascertain the extent of damage at the location, and so the time it will take to repair it is not yet known. He says the park needs to determine what approach to the problem makes sense, and then effect those repairs. Nash says visitors can still enjoy views of the Grand Canyon of the Yellowstone by traveling along the North Rim Drive. However, viewing locations along the South Rim Drive such as Artist Point won’t be accessible until road repairs are completed.