Does 811 Mark Private Utility Lines in Colorado?

No. 811 tells the utility companies to mark their own lines up to your meter. Everything past the meter is yours, and a cleared ticket says nothing about it.

Two construction workers in safety gear, including helmets and vests, are walking and discussing plans at a construction site with a partially built multi-story building in the background
A construction worker wearing a white helmet and a tool belt stands with his back to the camera, observing a house under construction
811 vs. a private locate

Two different jobs, and you need both

Ticket cleared? Now the private side.

Send the address and what you are digging through the request form, or call or text (719) 800-4937. Firm quote, usually the same day.