US Bridges

600 South Street over I-15 (SR-15)

Fair

Iron County, Utah · In Cedar City · Structure no. 0F 255

Built
1968
57 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
194 ft
2 main spans
Daily traffic
9,248
2021 count
Owner
State
State Highway Agency

About this bridge

600 South Street over I-15 (SR-15) is a prestressed concrete stringer/multi-beam or girder carrying 600 South Street over I-15 (SR-15) in Iron County, Utah. It was built in 1968, so it is 57 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 9,248 vehicles a day, projected to reach 11,098 by 2041. The structure is 194 ft (59.1 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries600 South Street
CrossesI-15 (SR-15)
LocationIn Cedar City
RouteCity Street 1758
CountyIron County
StateUtah
Coordinates37.66667, -113.08
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61.8 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length194 ft (59.1 m)
Longest span100 ft (30.5 m)
Deck width41 ft (12.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,248 (2021)
Projected traffic11,098 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 600 South Street over I-15 (SR-15) built?

It was built in 1968, making it 57 years old in 2025.

What condition is 600 South Street over I-15 (SR-15) 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 March 2023.

How much traffic does 600 South Street over I-15 (SR-15) carry?

About 9,248 vehicles per day (2021 count).

How long is 600 South Street over I-15 (SR-15)?

The structure is 194 ft (59.1 m) long with a longest span of 100 ft (30.5 m) and a deck 41 ft wide.

Who owns 600 South Street over I-15 (SR-15)?

It is owned by the State Highway Agency.