US Bridges

SH 21 Newton over Buffalo River

Fair

Newton County, Arkansas · 1.10 Mile South of Boxley · Structure no. 000000000003469

Built
1962
63 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
302 ft
6 main spans
Daily traffic
420
2018 count
Owner
State
State Highway Agency

About this bridge

SH 21 Newton over Buffalo River is a steel stringer/multi-beam or girder carrying SH 21 Newton over Buffalo River in Newton County, Arkansas. It was built in 1962, so it is 63 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 420 vehicles a day, roughly 5% of them trucks, projected to reach 460 by 2038. The structure is 302 ft (92.1 m) long and 29 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesSH 21 Newton
CrossesBuffalo River
Location1.10 Mile South of Boxley
RouteState Highway 21
Coordinates35.96063, -93.40366
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.2 US tons
Inventory rating29.5 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length302 ft (92.1 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic420 (2018)
Projected traffic460 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 21 Newton over Buffalo River built?

It was built in 1962, making it 63 years old in 2025.

What condition is SH 21 Newton over Buffalo 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 SH 21 Newton over Buffalo River carry?

About 420 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is SH 21 Newton over Buffalo River?

The structure is 302 ft (92.1 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns SH 21 Newton over Buffalo River?

It is owned by the State Highway Agency.