US Bridges

CR 75N over Big Blue River

Fair

Henry County, Indiana · 00.20 E of SR 3 · Structure no. 3300086

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
136 ft
3 main spans
Daily traffic
443
2021 count
Owner
County
County Highway Agency

About this bridge

CR 75N over Big Blue River is a steel continuous stringer/multi-beam or girder carrying CR 75N over Big Blue River in Henry County, Indiana. It was built in 1975, so it is 50 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 443 vehicles a day, roughly 8% of them trucks, projected to reach 678 by 2041. The structure is 136 ft (41.6 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR 75N
CrossesBig Blue River
Location00.20 E of SR 3
RouteCounty Highway 152
CountyHenry County
StateIndiana
Coordinates39.94215, -85.38094
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 2023
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 geometry5: 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 rating60 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length136 ft (41.6 m)
Longest span51 ft (15.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic443 (2021)
Projected traffic678 by 2041
Trucks8%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$425,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 75N over Big Blue River built?

It was built in 1975, making it 50 years old in 2025.

What condition is CR 75N over Big Blue River 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 August 2023.

How much traffic does CR 75N over Big Blue River carry?

About 443 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is CR 75N over Big Blue River?

The structure is 136 ft (41.6 m) long with a longest span of 51 ft (15.5 m) and a deck 28 ft wide.

Who owns CR 75N over Big Blue River?

It is owned by the County Highway Agency.