Unified Police Department of Greater Salt Lake

Main Number 801.743.7000

Emergency 911 • Non-Emergency Dispatch 801.840.4000

File a Police Report Online

Unified Police Department of Greater Salt Lake

Main Number 801.743.7000

Emergency 911 • Non-Emergency Dispatch 801.840.4000

File a Police Report Online

Canyon Alerts


Over the years, there has been a huge increase in traffic through the Cottonwood Canyons. Last year, UDOT took over communications about road conditions in the canyons and has dedicated communications specialist to monitor and communicate conditions in the canyons.

Information about the Cottonwood Canyons, including current conditions, traffic cameras, traffic restrictions, equipment requirements, and more can be found at:

Cottonwood Canyons

How to Follow

For up-to-the-minute road conditions and alerts be sure to follow UDOT Cottonwood Canyons

    • Twitter: Follow @UDOTCottonwoods

Twitter – Cottonwood Canyons

    • Facebook: “Like” @UDOTCottonwoodCanyons

Facebook – Cottonwood Canyons

    • Instagram: Follow udotcottonwoods

Instagram – Cottonwood Canyons


Canyon Restrictions

Snow Tire, 4×4, Tire Chain Requirements in the Cottonwood Canyons

Daily Requirement October 1st through April 30th

The Utah Department of Transportation requires ALL vehicles travelling in Big and Little Cottonwood canyons to be equipped with approved snow tires October 1st through April 30th. Approved tires can be identified by an M+S (mud and snow) or a Snowflake symbol on the sidewall of the tire. At a minimum, snow tires must be mounted on the two primary drive wheels of the vehicle. Tires must have sufficient tread depth to be effective. No bald tires!

Absent approved snow tires (sometimes called winter tires) properly sized tire chains must be in your possession.

Enhanced public safety restrictions when yellow lights are flashing

During extreme weather, and when UDOT and Law Enforcement determine it is in the best interest of public safety, traffic may be restricted to mounted tire chains, studded snow tires, or Four Wheel Drive vehicles. Four wheel drive vehicles are not relieved of the snow tire requirement although most all terrain tires are acceptable.

Unfortunately, a small number of tire manufactures label their products as M+S (mud and snow) when in fact they do not possess the aggressive separated tread needed for safe canyon travel. This is especially true in some “sport –performance” wheels seen on luxury SUV’s.

Two wheel drive vehicles with four studded snow tires will be allowed access during restricted periods.

Two wheel drive vehicles with four mounted snow tires (without studs) MAY be denied canyon access if law enforcement believes they present a hazard to safe travel and other motorists. As a general rule vehicles equipped with aggressive snow tires will be granted access but there may be times, due to very poor road conditions or deep snow, when they are denied access. The police officer will need to make this determination base on common sense and known road condition information.

Our goal is to provide the safest driving experience possible while travelling the canyons. One improperly equipped vehicle can put many other people at risk. Please email our canyon officers at with any additional question about road restrictions or canyon closures. help@canyonalerts.org

UDOT Snow Tire and Chain Up Requirements