US Bridges

US 31 over Flatrock River

Good

Bartholomew County, Indiana · 05.42 S I-65 · Structure no. 009290

Built
2006
19 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
544 ft
4 main spans
Daily traffic
21,394
2022 count
Owner
State
State Highway Agency

About this bridge

US 31 over Flatrock River is a prestressed concrete continuous tee beam carrying US 31 over Flatrock River in Bartholomew County, Indiana. It was built in 2006, so it is 19 years old, younger than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21,394 vehicles a day, roughly 5% of them trucks, projected to reach 30,243 by 2031. The structure is 544 ft (165.8 m) long and 69 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesUS 31
CrossesFlatrock River
Location05.42 S I-65
RouteU.S. Route 31
StateIndiana
Coordinates39.23534, -85.9272
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length544 ft (165.8 m)
Longest span135 ft (41.2 m)
Deck width69 ft (21 m)
Roadway width63 ft (19.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,394 (2022)
Projected traffic30,243 by 2031
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 US 31 over Flatrock River built?

It was built in 2006, making it 19 years old in 2025.

What condition is US 31 over Flatrock River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does US 31 over Flatrock River carry?

About 21,394 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is US 31 over Flatrock River?

The structure is 544 ft (165.8 m) long with a longest span of 135 ft (41.2 m) and a deck 69 ft wide.

Who owns US 31 over Flatrock River?

It is owned by the State Highway Agency.