US Bridges

I 15; SB over Virgin River

Poor

Mohave County, Arizona · 15.4 MI E of Nevada · Structure no. 01618

Built
1973
52 years old, rebuilt 2020
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
496 ft
3 main spans
Daily traffic
14,906
2022 count
Owner
State
State Highway Agency

About this bridge

I 15; SB over Virgin River is a steel continuous stringer/multi-beam or girder carrying I 15; SB over Virgin River in Mohave County, Arizona. It was built in 1973 and reconstructed in 2020, so it is 52 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 14,906 vehicles a day, roughly 33% of them trucks, projected to reach 14,916 by 2042. The structure is 496 ft (151.2 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 15; SB
CrossesVirgin River
Location15.4 MI E of Nevada
RouteInterstate 15
StateArizona
Coordinates36.9256, -113.8324
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length496 ft (151.2 m)
Longest span212 ft (64.6 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,906 (2022)
Projected traffic14,916 by 2042
Trucks33%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15; SB over Virgin River built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2020.

What condition is I 15; SB over Virgin River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does I 15; SB over Virgin River carry?

About 14,906 vehicles per day (2022 count), of which roughly 33% are trucks.

How long is I 15; SB over Virgin River?

The structure is 496 ft (151.2 m) long with a longest span of 212 ft (64.6 m) and a deck 32 ft wide.

Who owns I 15; SB over Virgin River?

It is owned by the State Highway Agency.