US Bridges

SR-100 over Chalk Creek

Fair

Millard County, Utah · 50 West 400 No. Fillmore · Structure no. 0C 749

Built
1988
37 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
1,289
2022 count
Owner
State
State Highway Agency

About this bridge

SR-100 over Chalk Creek is a steel stringer/multi-beam or girder carrying SR-100 over Chalk Creek in Millard County, Utah. It was built in 1988, so it is 37 years old, younger 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 45 ft (13.8 m) long and 51 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR-100
CrossesChalk Creek
Location50 West 400 No. Fillmore
RouteState Highway 100
CountyMillard County
StateUtah
Coordinates38.97766, -112.32515
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106 US tons
Inventory rating71.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length45 ft (13.8 m)
Longest span43 ft (13 m)
Deck width51 ft (15.6 m)
Roadway width39 ft (11.9 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
CrossesWaterway
Detour if closed3.7 mi (6 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 Chalk Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is SR-100 over Chalk Creek 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 Chalk Creek carry?

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

How long is SR-100 over Chalk Creek?

The structure is 45 ft (13.8 m) long with a longest span of 43 ft (13 m) and a deck 51 ft wide.

Who owns SR-100 over Chalk Creek?

It is owned by the State Highway Agency.