US Bridges

Main ST over ST Marys River

Fair

Allen County, Indiana · 00.10 W of Rockhill ST · Structure no. 0200262

Built
1921
104 years old, rebuilt 1997
Condition
Fair
inspected May 2024
Type
Arch - Deck
Concrete
Length
304 ft
3 main spans
Daily traffic
14,025
2024 count
Owner
County
County Highway Agency

About this bridge

Main ST over ST Marys River is a concrete arch - deck carrying Main ST over ST Marys River in Allen County, Indiana. It was built in 1921 and reconstructed in 1997, so it is 104 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.

It carries about 14,025 vehicles a day, roughly 5% of them trucks, projected to reach 20,000 by 2044. The structure is 304 ft (92.6 m) long and 57 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMain ST
CrossesST Marys River
Location00.10 W of Rockhill ST
RouteCity Street 0
CountyAllen County
StateIndiana
Coordinates41.07854, -85.1544
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating33.4 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length304 ft (92.6 m)
Longest span104 ft (31.6 m)
Deck width57 ft (17.3 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,025 (2024)
Projected traffic20,000 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over ST Marys River built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1997.

What condition is Main ST over ST Marys 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 May 2024.

How much traffic does Main ST over ST Marys River carry?

About 14,025 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Main ST over ST Marys River?

The structure is 304 ft (92.6 m) long with a longest span of 104 ft (31.6 m) and a deck 57 ft wide.

Who owns Main ST over ST Marys River?

It is owned by the County Highway Agency.