Colo. Rev. Stat. § 40-24-104
Any person, company, corporation, or association to whom any such right-of-way and franchise is granted shall construct and maintain its railroad on either side of the county road, and, at its own expense and in good substantial manner, shall strengthen and repair all bridges and culverts on said county road which are used or occupied jointly by said electric railroad and the traveling public, and, thereafter during the existence of said franchise, shall contribute and pay not less than one-half of the necessary expense of keeping said bridges and culverts in good repair, and shall pay all expense of keeping public and private crossings planked and in good repair, and, at its own expense, shall widen to not less than twenty-four feet all bridges, culverts, cuts, and embankments on said public highway which are used or occupied jointly by said electric railroad and the traveling public.
C.R.S. § 40-24-104