US Bridges

Benton US 412 over Illinois River

Fair

Benton County, Arkansas · 11.64 MI E of Oklahoma LN · Structure no. 0000000000B6478

Built
1995
30 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,344 ft
19 main spans
Daily traffic
10,000
2018 count
Owner
State
State Highway Agency

About this bridge

Benton US 412 over Illinois River is a steel continuous stringer/multi-beam or girder carrying Benton US 412 over Illinois River in Benton County, Arkansas. It was built in 1995, so it is 30 years old, younger than the Arkansas average of 45.1 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 10,000 vehicles a day, roughly 1% of them trucks, projected to reach 25,900 by 2038. The structure is 1,344 ft (409.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesBenton US 412
CrossesIllinois River
Location11.64 MI E of Oklahoma LN
RouteU.S. Route 412
CountyBenton County
StateArkansas
Coordinates36.17202, -94.36971
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans19
Design loadHS 20
Structure length1,344 ft (409.7 m)
Longest span120 ft (36.6 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2018)
Projected traffic25,900 by 2038
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Benton US 412 over Illinois River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Benton US 412 over Illinois River 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 July 2023.

How much traffic does Benton US 412 over Illinois River carry?

About 10,000 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Benton US 412 over Illinois River?

The structure is 1,344 ft (409.7 m) long with a longest span of 120 ft (36.6 m) and a deck 43 ft wide.

Who owns Benton US 412 over Illinois River?

It is owned by the State Highway Agency.