If you are just looking for a place to pull into for the night, this might work for you. It is right on I-5. You can see and hear the traffic go by all night long. Not the easiest place to get in and out of if you have a larger rig.
With its long pull through sites, this is a great place to pull into and spend the night. Good power and water. Internet works best the closer you are to the office. Doesn't work so great on the outer edges of the park. There are ponds, streams, and marshes all around the park, so the flying bugs are bad. You can get eaten alive by bugs while walking outside, especially in the evening hours. We looked at the other options in this area, and this is by far the nicest place to stay in La Grande. We would spend the night here again while traveling through, but we would bring our bug spray with us.