US Bridges

County Road over I-15 (SR-15) Nbl & Sbl

Fair

Iron County, Utah · 4.2 Mi. N.Of New Harmony · Structure no. 0D 752

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
206 ft
4 main spans
Daily traffic
5,000
2012 count
Owner
State
State Highway Agency

About this bridge

County Road over I-15 (SR-15) Nbl & Sbl is a concrete continuous tee beam carrying County Road over I-15 (SR-15) Nbl & Sbl in Iron 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 5 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 5,000 vehicles a day, projected to reach 7,000 by 2034. The structure is 206 ft (62.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road
CrossesI-15 (SR-15) Nbl & Sbl
Location4.2 Mi. N.Of New Harmony
RouteCounty Highway 0
CountyIron County
StateUtah
Coordinates37.54089, -113.20306
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length206 ft (62.8 m)
Longest span70 ft (21.2 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic5,000 (2012)
Projected traffic7,000 by 2034
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 County Road over I-15 (SR-15) Nbl & Sbl built?

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

What condition is County Road 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 March 2023.

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

About 5,000 vehicles per day (2012 count).

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

The structure is 206 ft (62.8 m) long with a longest span of 70 ft (21.2 m) and a deck 30 ft wide.

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

It is owned by the State Highway Agency.