US Bridges

I 15; NB over Old US 91

Fair

Mohave County, Arizona · 8.6 MI E of Nevada · Structure no. 01612

Built
1974
51 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
153 ft
1 main span
Daily traffic
9,872
2022 count
Owner
State
State Highway Agency

About this bridge

I 15; NB over Old US 91 is a prestressed concrete box beam or girders - single or spread carrying I 15; NB over Old US 91 in Mohave County, Arizona. It was built in 1974, so it is 51 years old, older than the Arizona average of 47.8 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 9,872 vehicles a day, roughly 26% of them trucks, projected to reach 9,882 by 2042. The structure is 153 ft (46.6 m) long and 45 ft wide.

Location

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CarriesI 15; NB
CrossesOld US 91
Location8.6 MI E of Nevada
RouteInterstate 15
CountyMohave County
StateArizona
Coordinates36.8912, -113.9297
Functional classRural Principal Arterial - Interstate

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.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span151 ft (46 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,872 (2022)
Projected traffic9,882 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 15; NB over Old US 91 built?

It was built in 1974, making it 51 years old in 2025.

What condition is I 15; NB over Old US 91 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 December 2024.

How much traffic does I 15; NB over Old US 91 carry?

About 9,872 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is I 15; NB over Old US 91?

The structure is 153 ft (46.6 m) long with a longest span of 151 ft (46 m) and a deck 45 ft wide.

Who owns I 15; NB over Old US 91?

It is owned by the State Highway Agency.