Tag Archives: Arizona

Nevada I-15 flooding required a multi-state response

A two-mile stretch of I-15 near milepost 91 in Nevada was washed away due to heavy rainfall that started on Monday, September 8th. In an unprecedented storm around 4 inches of rain fell in the space of 2 hours, flooding the road and washing away ground and asphalt leaving the interstate impassable. Record breaking numbers of rainfall were reported along streams in the area.

The Nevada DOT declared a state of emergency on Tuesday, September 9 due to the importance of passenger vehicle and commercial trucking flow on I-15. According to Arizona Department of Transportation, approximately 23,000 vehicles use I-15 each day between St. George, Utah and Las Vegas, Nevada.

Warnings on Utah’s freeway message boards were posted up and down I-15 letting drivers know that the freeway would be closed down and provided details for  alternate routes. These signs went as far east as Nebraska to provide enough time for travelers to change their routes.

Screen shot of tweet that says 'From nevadadot semi restriction lifted (except oversie w/o permit) on NV I-15Information was also available to drivers via the 511 phone line, the Utah Trucking Association, news outlets, Arizona and Nevada DOT’s, the UDOT Traffic website, the UDOT Traffic Twitter account and the UDOT Traffic app. UDOT’s social media channels proved very valuable during this event.

Travelers were directed to take S.R. 56 out of Cedar City to Nevada S.R. 319 and then to the U.S. 93 back to the freeway. UDOT and NDOT worked very hard to provide accurate and timely information to motorists traveling on this alternative.

State DOT’s had to work together. Although the closure was not in Utah UDOT was heavily involved in sending support to the affected areas. Due to increased traffic on S.R. 56 a UDOT Incident Management Team (IMT) was dispatched to assist. The IMT crews directed traffic, filled potholes and moved disabled semis out of traffic.

They also deployed a portable traffic camera trailer to the S.R. 18/S.R. 56 junction to monitor any potential problems and back-ups. UDOT’s Region 4 shared access to this camera with Nevada DOT. Region 4 was also able to respond quickly to a rockslide on the Arizona section of I-15 and sent snow plows to clear rock debris in the Virgin River Gorge area.

Southbound I-15 reopened to traffic on Friday, September 12th to one lane in each direction for passenger vehicles. Northbound lanes reopened on September 18.

Glenn Blackwelder a Traffic Operations Engineer at UDOT said “We could not have done it on our own. It took the communication and resources of the Traffic Operations Center, Region 4 and NDOT working together. We were pleased with how all agencies and divisions were able to work together to get I-15 back open as quickly as possible.”Screen shot of tweet and attached map showing detour route. The tweet reads "Reminder: Nevada I-15 closed due to flooding. So Cal and Vegas detour map:"

This guest post was written by Adam McMillan, Traffic Operations Center Intern.


UDOT is working to improve deer use of the crossings and prevent motorist-wildlife crashes.

Photo of deer using the crossingThe fall migration of the Paunsaugunt mule deer herd reaches its height between October and November as deer move south, and eventually end up east of Kanab or in Arizona near the Kiabab Plateau. This is the second year that migrating deer will encounter new fencing and wildlife crossings on U.S. 89 east of Kanab. Since Utah’s deer hunt coincides with the migration, it’s more likely that people and deer will come into close proximity near a wildlife crossing or along U.S. 89. And when people are near, deer appear to be less likely to learn to use wildlife crossings.

The new fencing is designed to direct deer to the under-highway crossings, but it can take three years or more before most of the animals in the herd learn the crossing options. UDOT is identifying and implementing measures to improve crossings by working with Patricia Cramer, PhD, Utah State University Research Assistant Professor, Arizona Game and Fish, the BLM and the Grand Staircase agencies and employees from the Utah Division of Wildlife Resources.

“We’re very interested to see how it works out this year,” says Randall Taylor from the UDOT Region Four Richfield office. He has been part of an effort to install fencing and three crossings along a 12.5 mile area with the highest wildlife-automobile crash history. “This project does not cover the whole area but it’s an important first step at the core of the accidents.”

Photo of deer using the crossingSoon after project completion in September 2013, Cramer placed motion-activated cameras at each crossing. The photos provide information about how many deer are using the crossings, and identify reasons deer may be deterred.

Photos from last year show more people near the crossings during the deer hunt, and fewer deer making the trek across. Probably because the crossings were new, deer congregated near the fencing along the highway. Road users saw the deer and stopped to take a look. UDOT responded by placing variable message signs to discourage motorists from pulling over.

Other circumstances served to deter deer from following the fencing and using the crossings. Gaps under the fencing encouraged deer to push through on to the pavement. “Flooding was to blame for some of those gaps, and coyotes were the cause of others,” says Taylor. UDOT and UDWR are monitoring the fencing and filling gaps as soon as possible.

Besides doing work on the project corridor, UDWR is communicating directly with hunters; a message about staying away from crossings will go out with each license holder.

The crossings are important to highway safety in the area. Pre-project crash data indicates that building the crossings prevents an estimated 132 crashes per year. “Hopefully, more deer will get across this year. The research Patti Cramer is doing is helping.”

For more:

Read a post about how UDOT collaborates to improve crossings written by Patricia Cramer, PhD, Utah State University