Canyon Traffic Alerts

Be the first to find out about canyon closures in Little & Big Cottonwood Canyons. By subscribing you can prevent the inconvenience of an unexpected delay in the event of a canyon closure or restrictions. The Canyon Alert system is provided by the Unified Police Department.

IMPORTANT UPDATE: Text message system has been upgraded to a true SMS system to solve the issue of delayed messages. Alert messages will be sent when the canyon is CLOSED or OPEN. Messages such as restrictions on chains and 4×4 will only be sent to other subscription options. If you do want to get all messages via SMS on your cell phone text “follow canyonalerts” to 40404.

What are the canyon restriction rules? Check out Canyon Restrictions Demystified

Subscribe to Canyon Alerts

With our new alert system you can get updates on the current traffic status in Big and Little Cottonwood canyons in real time through a number of subscription methods. Pick the one that best suits your needs!

    Follow “CanyonAlerts” on twitter.
    Go now.

    Instant* Receive all updates

    “Like” our “CanyonAlerts” Facebook page. Go now.

    Instant* Receive all updates

    Send a blank email to
    Can be delayed up to 40 minutes.

    From cell phone text “follow canyonalerts” to 40404
    to receive all updates

    From cell phone text “canyonalerts” to 53535
    to receive only critical open/close updates

    RSS Reader

    Copy the following url into your feed reader.

*Subject to twitter’s availability and up time
**Message & Data rates may apply. SMS/Texting subscriptions are subject to the UPD privacy policy.

As you travel up Big and Little Cottonwood canyons from Nov 1st to March 31st, you’ll notice signs indicating that chains or snow tires are required. This creates some confusion as to exactly what the requirement is. The information below clarifies exactly what the restriction requires and how to prepare.

Restriction in a nutshell

From Nov. 1st to March 31st all vehicles traveling in Little and Big Cottonwood canyons must meet the following conditions:

  1. Be equipped with steel link chains; OR
  2. Have chains in possession (e.g. in your trunk, etc.); OR
  3. Be equipped with mounted snow tires; OR
  4. Be equipped with elastomeric tire chains designed for use with radial tires.

In addition:

  • Four-wheel drive vehicles must have a minimum of two mounted snow tires to meet the requirements.
  • Radial tires without snow tread do not meet the requirements.