US Bridges

SH 31 Log 3.54 over Salt Bayou

Poor

Lonoke County, Arkansas · 1 MI S JCT of US 165 · Structure no. 000000000002966

Built
1955
70 years old
Condition
Poor
inspected March 2023
Type
Channel Beam
Concrete
Length
133 ft
7 main spans
Daily traffic
720
2018 count
Owner
State
State Highway Agency

About this bridge

SH 31 Log 3.54 over Salt Bayou is a concrete channel beam carrying SH 31 Log 3.54 over Salt Bayou in Lonoke County, Arkansas. It was built in 1955, so it is 70 years old, older than the Arkansas average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 720 vehicles a day, roughly 1% of them trucks, projected to reach 773 by 2028. The structure is 133 ft (40.5 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSH 31 Log 3.54
CrossesSalt Bayou
Location1 MI S JCT of US 165
RouteState Highway 31
CountyLonoke County
StateArkansas
Coordinates34.53117, -91.87393
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating28 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length133 ft (40.5 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic720 (2018)
Projected traffic773 by 2028
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 31 Log 3.54 over Salt Bayou built?

It was built in 1955, making it 70 years old in 2025.

What condition is SH 31 Log 3.54 over Salt Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does SH 31 Log 3.54 over Salt Bayou carry?

About 720 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is SH 31 Log 3.54 over Salt Bayou?

The structure is 133 ft (40.5 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns SH 31 Log 3.54 over Salt Bayou?

It is owned by the State Highway Agency.