Utah State Route 145

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State Route 145 marker

State Route 145
Pioneer Crossing
American Fork Main Street
Route information
Defined by Utah Code §72-4-120
Maintained by UDOT
Length: 5.717 mi[2] (9.201 km)
Existed: 1978[1] – present
Major junctions
West end: SR-68 in Saratoga Springs
  I-15 in American Fork
East end: US-89 in American Fork
Highway system
SR-144 SR-146

State Route 145 (SR-145), a majority of which is also known as Pioneer Crossing, is a west–east thoroughfare completely within Utah County in northern Utah that cuts through Saratoga Springs, Lehi, American Fork, and portions of unincorporated Utah County. While the portion between Interstate 15 (I-15) and U.S. Route 89 (US-89) has been under state jurisdiction since 1978, the remaining roadway between SR-68 and I-15 (the section named Pioneer Crossing) opened in 2010, forming an alternative routing to SR-73, which also connects SR-68 and I-15 further north. The original portion of the route between I-15 (including the interchange) and US-89 is designated as Main Street in American Fork's street grid.

Route description[edit]

Commencing from the route's western terminus in northern Saratoga Springs, SR-145 heads east as Pioneer Crossing with two lanes in each direction, divided by a center turn lane. After crossing over the Jordan River, the route takes a brief northeasterly turn before returning due east. The route passes through a rural area of western Utah County before entering a stretch of development past 2300 West. The highway turns southeast to avoid development before again turning northeast and east. The road gains a third lane in each direction past 300 East (on Lehi's grid) then becomes American Fork Main Street just prior to where it meets I-15 at a diverging diamond interchange (DDI). The road continues east for about a half-mile and ends at an intersection with State Street (US-89).[3]


State maintenance of Main Street in American Fork (from I-15 to US-89) was established in May 1978, the state legislature approving that the following year. By 2003, a concept of a connector between Redwood Road (SR-68) and I-15 was presented in an environmental impact study for the Mountain View Corridor. After a separate study was completed in 2008, plans to construct the connector were set in place. As part of a project to reconstruct over twenty miles of I-15 through Utah County, the present interchange at Main Street was set to be rebuilt as a diverging diamond interchange (DDI) Construction began in early 2009, with the road opening to traffic in August 2010.[4] The DDI was the second to be opened in the United States, the first being in Missouri.[5] A subsequent DDI was also created when the American Fork 500 East interchange with I-15 was rebuilt.

Major intersections[edit]

The entire route is located in Utah County.

Location Mile[2] Kilometer Major Roads Intersected Notes
Saratoga Springs 0.000 0.000 SR-68 (Redwood Road) Western terminus
American Fork 5.311 8.547 I-15 – Provo, Salt Lake City Diverging diamond interchange
5.717 9.201 US-89 (State Street) Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ Utah Department of Transportation, Highway Resolutions: Route 145 PDF (623 KB), updated November 2008, accessed September 2010.
  2. ^ a b Utah Department of Transportation, Highway Referencing: Route 145 PDF (19 KB), updated August 2010, accessed September 2010.
  3. ^ "Google Maps". Google. 
  4. ^ Utah Department of Transportation, Pioneer Crossing - Project History, accessed 4 October 2010.
  5. ^ Utah Department of Transportation, Pioneer Crossing - Diverging Diamond Interchange, accessed 4 October 2010.