US Bridges

SH 9 Izard County over Knob Creek

Good

Izard County, Arkansas · 0.2 M N JCT 56 Brockwell · Structure no. 0000000000X1375

Built
2010
15 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete
Length
68 ft
5 main spans
Daily traffic
1,704
2018 count
Owner
State
State Highway Agency

About this bridge

SH 9 Izard County over Knob Creek is a concrete culvert carrying SH 9 Izard County over Knob Creek in Izard County, Arkansas. It was built in 2010, so it is 15 years old, younger than the Arkansas average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,704 vehicles a day, roughly 10% of them trucks, projected to reach 3,200 by 2029. The structure is 68 ft (20.7 m) long. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSH 9 Izard County
CrossesKnob Creek
Location0.2 M N JCT 56 Brockwell
RouteState Highway 9
CountyIzard County
StateArkansas
Coordinates36.14468, -91.9274
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20 + Mod
Structure length68 ft (20.7 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,704 (2018)
Projected traffic3,200 by 2029
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 9 Izard County over Knob Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is SH 9 Izard County over Knob Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does SH 9 Izard County over Knob Creek carry?

About 1,704 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is SH 9 Izard County over Knob Creek?

The structure is 68 ft (20.7 m) long with a longest span of 12 ft (3.7 m).

Who owns SH 9 Izard County over Knob Creek?

It is owned by the State Highway Agency.