811 In Your State


Explore damage prevention information, local contacts and rules for safe digging in Colorado.

Logo of Colorado 811

Colorado 811
811 or 800-922-1987

Visit Website


16361 Table Mountain Pkwy.
Golden, CO 80403

M - F 0700 - 1700
Emergency Coverage 24/7

Advanced Notice: 2 days not to include the day of notice
Number of days in advance of a digging project that you need to notify the one call center of your intent to dig.

Marks Valid: 30 days
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.