US Bridges

CR 75 over Big Run

Fair

DeKalb County, Indiana · 00.30 S of CR 28 · Structure no. 1700063

Built
1950
75 years old, rebuilt 1972
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
425
2024 count
Owner
County
County Highway Agency

About this bridge

CR 75 over Big Run is a prestressed concrete box beam or girders - multiple carrying CR 75 over Big Run in DeKalb County, Indiana. It was built in 1950 and reconstructed in 1972, so it is 75 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 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 425 vehicles a day, roughly 6% of them trucks, projected to reach 575 by 2044. The structure is 55 ft (16.9 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR 75
CrossesBig Run
Location00.30 S of CR 28
RouteCounty Highway 71
CountyDeKalb County
StateIndiana
Coordinates41.42645, -84.8327
Functional classRural Minor 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 within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.5 US tons
Inventory rating42.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length55 ft (16.9 m)
Longest span53 ft (16.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (2024)
Projected traffic575 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 CR 75 over Big Run built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1972.

What condition is CR 75 over Big Run 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 CR 75 over Big Run carry?

About 425 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is CR 75 over Big Run?

The structure is 55 ft (16.9 m) long with a longest span of 53 ft (16.1 m) and a deck 24 ft wide.

Who owns CR 75 over Big Run?

It is owned by the County Highway Agency.