CO 52 Pre-culvert installation
https://www.codot.gov/projects/archived-project-sites/co52-prospect-valley-resurfacing-and-culvert-improvements/photo-gallery/co-52-4-1.jpg/view
https://www.codot.gov/projects/archived-project-sites/co52-prospect-valley-resurfacing-and-culvert-improvements/photo-gallery/co-52-4-1.jpg/@@download/image/CO 52 4 (1).jpg
CO 52 Pre-culvert installation