US Bridges

SR-100 over I-15 (SR-15) Nbl & Sbl

Fair

Millard County, Utah · West Side of Fillmore · Structure no. 0C 445

Built
1972
53 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
246 ft
2 main spans
Daily traffic
1,289
2022 count
Owner
State
State Highway Agency

About this bridge

SR-100 over I-15 (SR-15) Nbl & Sbl is a steel continuous stringer/multi-beam or girder carrying SR-100 over I-15 (SR-15) Nbl & Sbl in Millard County, Utah. It was built in 1972, so it is 53 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 1,289 vehicles a day, roughly 21% of them trucks, projected to reach 1,547 by 2042. The structure is 246 ft (75 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR-100
CrossesI-15 (SR-15) Nbl & Sbl
LocationWest Side of Fillmore
RouteState Highway 100
CountyMillard County
StateUtah
Coordinates38.97814, -112.3379
Functional classRural Major Collector

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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length246 ft (75 m)
Longest span121 ft (36.9 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,289 (2022)
Projected traffic1,547 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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-100 over I-15 (SR-15) Nbl & Sbl built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR-100 over I-15 (SR-15) Nbl & Sbl 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 February 2023.

How much traffic does SR-100 over I-15 (SR-15) Nbl & Sbl carry?

About 1,289 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is SR-100 over I-15 (SR-15) Nbl & Sbl?

The structure is 246 ft (75 m) long with a longest span of 121 ft (36.9 m) and a deck 40 ft wide.

Who owns SR-100 over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.