US Bridges

SR 75 over Harter Ditch

Fair

Carroll County, Indiana · 01.27 N SR 18 · Structure no. 024990

Built
1966
59 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
35 ft
3 main spans
Daily traffic
1,326
2020 count
Owner
State
State Highway Agency

About this bridge

SR 75 over Harter Ditch is a concrete culvert carrying SR 75 over Harter Ditch in Carroll County, Indiana. It was built in 1966, so it is 59 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 1,326 vehicles a day, roughly 20% of them trucks, projected to reach 2,543 by 2030. The structure is 35 ft (10.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSR 75
CrossesHarter Ditch
Location01.27 N SR 18
RouteState Highway 75
CountyCarroll County
StateIndiana
Coordinates40.56447, -86.53389
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating97.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length35 ft (10.6 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,326 (2020)
Projected traffic2,543 by 2030
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 75 over Harter Ditch built?

It was built in 1966, making it 59 years old in 2025.

What condition is SR 75 over Harter 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 November 2023.

How much traffic does SR 75 over Harter Ditch carry?

About 1,326 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is SR 75 over Harter Ditch?

The structure is 35 ft (10.6 m) long with a longest span of 11 ft (3.3 m).

Who owns SR 75 over Harter Ditch?

It is owned by the State Highway Agency.