US Bridges

SR 18 over Andrews Ditch

Fair

Benton County, Indiana · 01.47 W US 41 · Structure no. 004540

Built
1955
70 years old, rebuilt 1995
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
462
2021 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Andrews Ditch is a concrete slab carrying SR 18 over Andrews Ditch in Benton County, Indiana. It was built in 1955 and reconstructed in 1995, so it is 70 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 462 vehicles a day, roughly 28% of them trucks, projected to reach 1,093 by 2032. The structure is 26 ft (7.9 m) long and 41 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesSR 18
CrossesAndrews Ditch
Location01.47 W US 41
RouteState Highway 18
CountyBenton County
StateIndiana
Coordinates40.62193, -87.40886
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic462 (2021)
Projected traffic1,093 by 2032
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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 SR 18 over Andrews Ditch built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1995.

What condition is SR 18 over Andrews Ditch 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 2024.

How much traffic does SR 18 over Andrews Ditch carry?

About 462 vehicles per day (2021 count), of which roughly 28% are trucks.

How long is SR 18 over Andrews Ditch?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 41 ft wide.

Who owns SR 18 over Andrews Ditch?

It is owned by the State Highway Agency.