US Bridges

CR 550N over Flatrock River Overflow

Good

Bartholomew County, Indiana · 02.81 E US 31 · Structure no. 0300227

Built
1985
40 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
6,380
2022 count
Owner
County
County Highway Agency

About this bridge

CR 550N over Flatrock River Overflow is a prestressed concrete stringer/multi-beam or girder carrying CR 550N over Flatrock River Overflow in Bartholomew County, Indiana. It was built in 1985, so it is 40 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 6,380 vehicles a day, roughly 5% of them trucks, projected to reach 9,610 by 2038. The structure is 66 ft (20.1 m) long and 34 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesCR 550N
CrossesFlatrock River Overflow
Location02.81 E US 31
RouteCounty Highway 52
StateIndiana
Coordinates39.2817, -85.90684
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span65 ft (19.8 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,380 (2022)
Projected traffic9,610 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 550N over Flatrock River Overflow built?

It was built in 1985, making it 40 years old in 2025.

What condition is CR 550N over Flatrock River Overflow 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 May 2024.

How much traffic does CR 550N over Flatrock River Overflow carry?

About 6,380 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is CR 550N over Flatrock River Overflow?

The structure is 66 ft (20.1 m) long with a longest span of 65 ft (19.8 m) and a deck 34 ft wide.

Who owns CR 550N over Flatrock River Overflow?

It is owned by the County Highway Agency.