Utah State Route 109
state highway in Layton, Utah, United States
State Route 109 (or SR-109) is a state highway in the U.S. state of Utah. The route serves as an east–west connector in the city of Layton in Davis County.
Route description
SR-109 begins at the intersection of SR-126 (Main Street) and Gentile Street in the historic section of Layton, close to the historic Utah Central Railroad and the current-day Union Pacific Railroad, and the Layton Frontrunner station. From here, the route travels east along Gentile Street, almost immediately crossing I-15 via an overpass, after which it passes by the Layton city offices and Layton High School. From this point onwards, the route primarily passes by residential subdivisions, crossing Fort Lane and Fairfield Road, the two primary north–south roads in the area. Shortly after Fairfield, the route splits off from Gentile Street, becoming Oak Hills Drive as it continues east-northeast, climbing into the foothills of the Wasatch Mountains, where it ends at a diamond interchange with US 89.
History
SR-109 was originally established in 1931 as the road from SR-1 (US 91) westerly for four miles along what is now Gentile Street in Layton.
In 1969, the route was moved to the east along the same street (Gentile Street) to its current alignment.
In 2021, the at-grade intersection with US 89 at SR-109's eastern terminus was replaced with a grade-separated diamond interchange as part of a major project to reconstruct US 89 as a six-lane freeway between I-15 in Farmington and I-84 in Uintah.
Major intersections
The entire route is in Layton, Davis County.
This brief starts where responsible research should: with the source description of “Utah State Route 109” as state highway in Layton, Utah, United States. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as state highway in Layton, Utah, United States. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Oct 6, 2025. The linked authority identifier is Q2506326. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1931, 1969 and 2021.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
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- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Utah State Route 109”, its source revision and the description used here.
- Expand the search: follow Utah State Route 109 primary sources, Utah State Route 109 archive and Utah research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Utah State Route 109” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.