US Bridges

SH 4-18 Lm 9.42 over Lake Isaacs

Fair

Desha County, Arkansas · 1.8 MI SE SH 1-ROHWER · Structure no. 000000000004183

Built
1962
63 years old
Condition
Fair
inspected January 2025
Type
Channel Beam
Concrete
Length
247 ft
13 main spans
Daily traffic
1,600
2018 count
Owner
State
State Highway Agency

About this bridge

SH 4-18 Lm 9.42 over Lake Isaacs is a concrete channel beam carrying SH 4-18 Lm 9.42 over Lake Isaacs in Desha County, Arkansas. It was built in 1962, so it is 63 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 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 1,600 vehicles a day, roughly 1% of them trucks, projected to reach 1,385 by 2028. The structure is 247 ft (75.3 m) long and 25 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesSH 4-18 Lm 9.42
CrossesLake Isaacs
Location1.8 MI SE SH 1-ROHWER
RouteState Highway 4
CountyDesha County
StateArkansas
Coordinates33.71479, -91.25888
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating36 US tons
Inventory rating22 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans13
Design loadH 15
Structure length247 ft (75.3 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2018)
Projected traffic1,385 by 2028
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 4-18 Lm 9.42 over Lake Isaacs built?

It was built in 1962, making it 63 years old in 2025.

What condition is SH 4-18 Lm 9.42 over Lake Isaacs 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 SH 4-18 Lm 9.42 over Lake Isaacs carry?

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

How long is SH 4-18 Lm 9.42 over Lake Isaacs?

The structure is 247 ft (75.3 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns SH 4-18 Lm 9.42 over Lake Isaacs?

It is owned by the State Highway Agency.