US Bridges

AR-18 over Big Lake Relief

Good

Mississippi County, Arkansas · 3.1 Mi. E Manilla · Structure no. 000000000007392

Built
2019
6 years old
Condition
Good
inspected September 2021
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
436 ft
4 main spans
Daily traffic
6,300
2016 count
Owner
State
State Highway Agency

About this bridge

AR-18 over Big Lake Relief is a steel continuous stringer/multi-beam or girder carrying AR-18 over Big Lake Relief in Mississippi County, Arkansas. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,300 vehicles a day, roughly 10% of them trucks, projected to reach 7,600 by 2036. The structure is 436 ft (133 m) long and 78 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesAR-18
CrossesBig Lake Relief
Location3.1 Mi. E Manilla
RouteState Highway 18
Coordinates35.84781, -90.12377
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating36 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length436 ft (133 m)
Longest span126 ft (38.4 m)
Deck width78 ft (23.8 m)
Roadway width75 ft (22.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2016)
Projected traffic7,600 by 2036
Trucks10%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

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 AR-18 over Big Lake Relief built?

It was built in 2019, making it 6 years old in 2025.

What condition is AR-18 over Big Lake Relief 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 September 2021.

How much traffic does AR-18 over Big Lake Relief carry?

About 6,300 vehicles per day (2016 count), of which roughly 10% are trucks.

How long is AR-18 over Big Lake Relief?

The structure is 436 ft (133 m) long with a longest span of 126 ft (38.4 m) and a deck 78 ft wide.

Who owns AR-18 over Big Lake Relief?

It is owned by the State Highway Agency.