US Bridges

Calhoun CR 20 Z-C over King Slough

Fair

Calhoun County, Arkansas · 1.8 MI S CR 29 · Structure no. 000000000004468

Built
1983
42 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
140 ft
4 main spans
Daily traffic
668
2018 count
Owner
County
County Highway Agency

About this bridge

Calhoun CR 20 Z-C over King Slough is a concrete slab carrying Calhoun CR 20 Z-C over King Slough in Calhoun County, Arkansas. It was built in 1983, so it is 42 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 668 vehicles a day, roughly 1% of them trucks, projected to reach 80 by 2007. The structure is 140 ft (42.7 m) long and 27 ft wide.

CarriesCalhoun CR 20 Z-C
CrossesKing Slough
Location1.8 MI S CR 29
RouteCounty Highway 20
Coordinates33.43137, -92.58692
Functional classRural Minor 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 within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length140 ft (42.7 m)
Longest span35 ft (10.7 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic668 (2018)
Projected traffic80 by 2007
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Calhoun CR 20 Z-C over King Slough built?

It was built in 1983, making it 42 years old in 2025.

What condition is Calhoun CR 20 Z-C over King Slough 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 Calhoun CR 20 Z-C over King Slough carry?

About 668 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Calhoun CR 20 Z-C over King Slough?

The structure is 140 ft (42.7 m) long with a longest span of 35 ft (10.7 m) and a deck 27 ft wide.

Who owns Calhoun CR 20 Z-C over King Slough?

It is owned by the County Highway Agency.