US Bridges

CR 400N over Flatrock River

FairPosted for load

Bartholomew County, Indiana · 01.06 E US 31 · Structure no. 0300123

Built
1913
112 years old, rebuilt 1999
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
263 ft
2 main spans
Daily traffic
1,280
2022 count
Owner
County
County Highway Agency

About this bridge

CR 400N over Flatrock River is a steel truss - thru carrying CR 400N over Flatrock River in Bartholomew County, Indiana. It was built in 1913 and reconstructed in 1999, so it is 112 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. Its operating status is: posted for load restriction.

It carries about 1,280 vehicles a day, roughly 3% of them trucks, projected to reach 1,930 by 2038. The structure is 263 ft (80.1 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCR 400N
CrossesFlatrock River
Location01.06 E US 31
RouteCounty Highway 200
CountyBartholomew County
StateIndiana
Coordinates39.25947, -85.92238
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating28.5 US tons
Inventory rating22 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length263 ft (80.1 m)
Longest span128 ft (39 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic1,280 (2022)
Projected traffic1,930 by 2038
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.9 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 400N over Flatrock River built?

It was built in 1913, making it 112 years old in 2025. It was reconstructed in 1999.

What condition is CR 400N over Flatrock 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 June 2024.

How much traffic does CR 400N over Flatrock River carry?

About 1,280 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is CR 400N over Flatrock River?

The structure is 263 ft (80.1 m) long with a longest span of 128 ft (39 m) and a deck 16 ft wide.

Who owns CR 400N over Flatrock River?

It is owned by the County Highway Agency.