US Bridges

SR-109 Gentile St. over I-15 (SR-15) Nbl & S

Fair

Davis County, Utah · Gentile ST in Layton · Structure no. 0C 483

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
279 ft
4 main spans
Daily traffic
15,056
2022 count
Owner
State
State Highway Agency

About this bridge

SR-109 Gentile St. over I-15 (SR-15) Nbl & S is a steel continuous stringer/multi-beam or girder carrying SR-109 Gentile St. over I-15 (SR-15) Nbl & S in Davis County, Utah. It was built in 1966, so it is 59 years old, older than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 15,056 vehicles a day, roughly 10% of them trucks, projected to reach 18,067 by 2042. The structure is 279 ft (85 m) long and 68 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR-109 Gentile St.
CrossesI-15 (SR-15) Nbl & S
LocationGentile ST in Layton
RouteState Highway 109
CountyDavis County
StateUtah
Coordinates41.06028, -111.96389
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length279 ft (85 m)
Longest span95 ft (29 m)
Deck width68 ft (20.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,056 (2022)
Projected traffic18,067 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-109 Gentile St. over I-15 (SR-15) Nbl & S built?

It was built in 1966, making it 59 years old in 2025.

What condition is SR-109 Gentile St. over I-15 (SR-15) Nbl & S in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does SR-109 Gentile St. over I-15 (SR-15) Nbl & S carry?

About 15,056 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is SR-109 Gentile St. over I-15 (SR-15) Nbl & S?

The structure is 279 ft (85 m) long with a longest span of 95 ft (29 m) and a deck 68 ft wide.

Who owns SR-109 Gentile St. over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.