 In addition to these natural factors, much has been done intentionally to make the skies at the park clear and dark and help keep them that way.Within the park, former overhead electrical lines have been buried so they do not obstruct views, all lighting is shielded, and all white lights have been converted to red, which has the least effect on night vision and astrophotography.Light from passing vehicles is blocked by earthen berms covered with grass, or shrubbery and spruce trees; the Astronomy Field gate has a special light-blocking tarp.