This is the Colorado State Archives official website. Under the Menu icon you can select “Research” to search online records or you can scroll down to “Resources” and view the available resources as well as other useful websites for Colorado records (such as, “Digital Collections of Colorado”, etc.).
The Colorado State Archives has an online Archives Search to search their database by name, record type, and time span. They have instructions for helping make searches more successful. They also have many records that are not currently online.