US Bridges

SH 21 Madison CO over Kings River

Fair

Madison County, Arkansas · 2.96 MI S JCT US412&SH21 · Structure no. 000000000003263

Built
1959
66 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
302 ft
6 main spans
Daily traffic
1,600
2018 count
Owner
State
State Highway Agency

About this bridge

SH 21 Madison CO over Kings River is a steel stringer/multi-beam or girder carrying SH 21 Madison CO over Kings River in Madison County, Arkansas. It was built in 1959, so it is 66 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 5 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 1,600 vehicles a day, roughly 1% of them trucks, projected to reach 1,589 by 2028. The structure is 302 ft (92 m) long and 25 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesSH 21 Madison CO
CrossesKings River
Location2.96 MI S JCT US412&SH21
RouteState Highway 21
CountyMadison County
StateArkansas
Coordinates36.09923, -93.54385
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length302 ft (92 m)
Longest span50 ft (15.2 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2018)
Projected traffic1,589 by 2028
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 Madison CO over Kings River built?

It was built in 1959, making it 66 years old in 2025.

What condition is SH 21 Madison CO over Kings 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 2024.

How much traffic does SH 21 Madison CO over Kings River carry?

About 1,600 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is SH 21 Madison CO over Kings River?

The structure is 302 ft (92 m) long with a longest span of 50 ft (15.2 m) and a deck 25 ft wide.

Who owns SH 21 Madison CO over Kings River?

It is owned by the State Highway Agency.