US Bridges

CR 550S over W Fork Big Walnut Creek

FairPosted for load

Boone County, Indiana · 00.25 E of CR500 W · Structure no. 0600111

Built
1937
88 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
44 ft
1 main span
Daily traffic
670
2017 count
Owner
County
County Highway Agency

About this bridge

CR 550S over W Fork Big Walnut Creek is a concrete stringer/multi-beam or girder carrying CR 550S over W Fork Big Walnut Creek in Boone County, Indiana. It was built in 1937, so it is 88 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. Its operating status is: posted for load restriction.

It carries about 670 vehicles a day, roughly 5% of them trucks, projected to reach 1,020 by 2037. The structure is 44 ft (13.4 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR 550S
CrossesW Fork Big Walnut Creek
Location00.25 E of CR500 W
RouteCounty Highway 550
CountyBoone County
StateIndiana
Coordinates39.9593, -86.55718
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23.5 US tons
Inventory rating23.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span40 ft (12.1 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic670 (2017)
Projected traffic1,020 by 2037
Trucks5%
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 550S over W Fork Big Walnut Creek built?

It was built in 1937, making it 88 years old in 2025.

What condition is CR 550S over W Fork Big Walnut Creek 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 September 2023.

How much traffic does CR 550S over W Fork Big Walnut Creek carry?

About 670 vehicles per day (2017 count), of which roughly 5% are trucks.

How long is CR 550S over W Fork Big Walnut Creek?

The structure is 44 ft (13.4 m) long with a longest span of 40 ft (12.1 m) and a deck 29 ft wide.

Who owns CR 550S over W Fork Big Walnut Creek?

It is owned by the County Highway Agency.