US Bridges

Auburn Road over Diehl Ditch

Fair

DeKalb County, Indiana · 00.01 E of Diehl Road · Structure no. 1700016

Built
1992
33 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
79 ft
3 main spans
Daily traffic
5,350
2024 count
Owner
County
County Highway Agency

About this bridge

Auburn Road over Diehl Ditch is a concrete continuous slab carrying Auburn Road over Diehl Ditch in DeKalb County, Indiana. It was built in 1992, so it is 33 years old, younger 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 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 5,350 vehicles a day, roughly 15% of them trucks, projected to reach 7,775 by 2042. The structure is 79 ft (24 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesAuburn Road
CrossesDiehl Ditch
Location00.01 E of Diehl Road
RouteCity Street 0
CountyDeKalb County
StateIndiana
Coordinates41.352, -85.08092
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.3 US tons
Inventory rating45.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length79 ft (24 m)
Longest span30 ft (9.1 m)
Deck width36 ft (10.9 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,350 (2024)
Projected traffic7,775 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Auburn Road over Diehl Ditch built?

It was built in 1992, making it 33 years old in 2025.

What condition is Auburn Road over Diehl 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 October 2024.

How much traffic does Auburn Road over Diehl Ditch carry?

About 5,350 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Auburn Road over Diehl Ditch?

The structure is 79 ft (24 m) long with a longest span of 30 ft (9.1 m) and a deck 36 ft wide.

Who owns Auburn Road over Diehl Ditch?

It is owned by the County Highway Agency.