US Bridges

I 430-SEC 21 over River Mt RD RR Ark River

Fair

Pulaski County, Arkansas · 3 MI S I-40 · Structure no. 000000000005320

Built
1974
51 years old
Condition
Fair
inspected January 2025
Type
Girder and Floorbeam System
Steel Continuous
Length
4,986 ft
20 main spans
Daily traffic
87,000
2018 count
Owner
State
State Highway Agency

About this bridge

I 430-SEC 21 over River Mt RD RR Ark River is a steel continuous girder and floorbeam system carrying I 430-SEC 21 over River Mt RD RR Ark River in Pulaski County, Arkansas. It was built in 1974, so it is 51 years old, older 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 87,000 vehicles a day, roughly 1% of them trucks, projected to reach 110,174 by 2028. The structure is 4,986 ft (1,519.7 m) long and 107 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesI 430-SEC 21
CrossesRiver Mt RD RR Ark River
Location3 MI S I-40
RouteInterstate 430
CountyPulaski County
StateArkansas
Coordinates34.79695, -92.38267
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26 US tons
Inventory rating14 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans20 (+3 approach)
Design loadHS 20 + Mod
Structure length4,986 ft (1,519.7 m)
Longest span430 ft (131.1 m)
Deck width107 ft (32.7 m)
Roadway width102 ft (31.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic87,000 (2018)
Projected traffic110,174 by 2028
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed14.9 mi (24 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 proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I 430-SEC 21 over River Mt RD RR Ark River built?

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

What condition is I 430-SEC 21 over River Mt RD RR Ark 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 January 2025.

How much traffic does I 430-SEC 21 over River Mt RD RR Ark River carry?

About 87,000 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is I 430-SEC 21 over River Mt RD RR Ark River?

The structure is 4,986 ft (1,519.7 m) long with a longest span of 430 ft (131.1 m) and a deck 107 ft wide.

Who owns I 430-SEC 21 over River Mt RD RR Ark River?

It is owned by the State Highway Agency.