US Bridges

State Line Road over Flatrock Creek

Fair

Allen County, Indiana · 00.10 N of S County Line · Structure no. 0200640

Built
1940
85 years old, rebuilt 1983
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
46 ft
1 main span
Daily traffic
625
2018 count
Owner
County
County Highway Agency

About this bridge

State Line Road over Flatrock Creek is a steel stringer/multi-beam or girder carrying State Line Road over Flatrock Creek in Allen County, Indiana. It was built in 1940 and reconstructed in 1983, so it is 85 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.

It carries about 625 vehicles a day, roughly 8% of them trucks, projected to reach 933 by 2038. The structure is 46 ft (13.9 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Line Road
CrossesFlatrock Creek
Location00.10 N of S County Line
RouteCounty Highway 135
CountyAllen County
StateIndiana
Coordinates40.92354, -84.80291
Functional classRural Minor 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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.5 US tons
Inventory rating23.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length46 ft (13.9 m)
Longest span44 ft (13.3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic625 (2018)
Projected traffic933 by 2038
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Line Road over Flatrock Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1983.

What condition is State Line Road over Flatrock 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 May 2024.

How much traffic does State Line Road over Flatrock Creek carry?

About 625 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is State Line Road over Flatrock Creek?

The structure is 46 ft (13.9 m) long with a longest span of 44 ft (13.3 m) and a deck 24 ft wide.

Who owns State Line Road over Flatrock Creek?

It is owned by the County Highway Agency.