A UDOT Study


The US-89 Farmington to I-84 project is needed to address travel demand and improve safety along the corridor. Traffic models predict that by 2040, if US-89 is left in its current configuration, the traffic volume will increase by 43%, from 37,700 to 54,000 vehicles per day. This will exceed the current capacity of US-89. Also, more than 400 crashes have occurred in the last 3 years, 10 resulting in serious injury or fatality. The purpose of the study is to find a solution that accommodates the increase in traffic, maintains access, and enhances safety.

Currently, US-89 operates using a series of traffic signals at many of the intersections. The signals have become the cause of significant traffic congestion in recent years. This congestion also exists for cross traffic moving east-west. If added, grade-separated interchanges along US-89 from Farmington to I-84 will allow traffic to move more freely and at consistent speeds. In addition, eliminating traffic signals improves safety by reducing the risk of accidents.

Crash rate data shows that replacing intersections with grade-separated interchanges reduces the frequency and severity of accidents. Recent statistics show that the crash rate on a road like US-89 with traffic signals is 4.5 times higher than with interchanges. The rate of severe crashes is also 3.5 times higher. By removing signalized intersections and replacing them with grade-separated interchanges, the number of possible vehicle conflicts decreases substantially, resulting in fewer accidents.

Grade separation is a crossing of two roadways at different heights (grades). A bridge which spans roads (as an overpass) is a grade separation structure. The grade separation allows traffic on at least one road to pass through the junction without conflicts to any other traffic stream. A grade-separated interchange is an overpass with connecting ramps for access to and from US-89 mainline.

Grade-separated interchanges are being proposed at 200/400 North, Oak Hills Drive, Gordon Avenue, and Antelope Drive. Overpasses are being proposed at Nicholls Road and Crestwood Drive.

In the last few years, UDOT made some interim improvements along US-89 to relieve congestion and improve safety in areas near Antelope Drive and Nichols Road. At that time, funding wasn’t identified for the major corridor improvements now being contemplated. The proposed project is a long-term solution that will require reconstruction of much of the recent improvements.

Current and future traffic volumes are given below:

Cross Road with Annual Average Daily Traffic (AADT)

Actual Counts
Estimated 35% Increase
Shepard Lane 33,250 46,550
Nichols Road 34,480 48,272
200 S Fruit Heights 32,745 45,843
200 N Kaysville 33,440 46,816
Mutton Hollow Rd 33,225 46,515
Oak Hills Dr 33,445 46,823
Oak Lane 32,410 45,374
SR-193 Hill Field Rd 45,729 63,861
SR-60 – South Weber Dr. 49,785 69,699

73% of traffic is through traffic.

The project is currently scheduled for construction beginning in 2019.

UDOT will only acquire the Right of Way (ROW) necessary to build and safely operate the expanded roadway, frontage roads, and interchanges. During the design phase, the project team will evaluate the potential impacts to your property and determine if those impacts will require acquisition; however, not all properties located adjacent to US-89 in the project area will be impacted. If some of your property is needed for the project, a project team member will contact you to provide information and answer your questions. For all property acquisitions, UDOT follows state and federal relocation processes and procedures. A Right of Way brochure outlining the entire process can be obtained by sending a request to us89@utah.gov.

You can request to be added to the project email updates and contact list by going to www.udot.utah.gov/us89 or Email: US89@utah.gov or call us at 888-752-US89 (888-752-8789)

The preferred alternative is the alternative within the range of alternatives presented in the environmental study that the agency believes would best fulfill the purpose and need of the proposed action.

The Freeway Alternative with Two-Way Frontage Roads was selected because it meets the purpose and need, and when compared to all other build alternatives it has fewer relocations, fewer adverse effects to historic properties, and is less costly (see Figure 2-7 and Preferred Alternative maps in Volume 2).

The Final State Environmental Study, or Final SES, is the report required by UDOT for particular actions that could affect the quality of the human and natural environment. The Final SES describes the purpose and need, a description of the alternatives development and screening process, and detailed impact information for the alternatives evaluated for US-89. It also identified UDOT’s Preferred Alternative so that the public could provide feedback on that recommendation. Public Feedback was solicited through two public comment periods. (August 2017 through September 2017, and January 2018 through February 2018).