US Bridges

South Main ST over Kent Creek

Fair

Winnebago County, Illinois · 0.5 MI S of State ST · Structure no. 101611000000000

Built
1905
120 years old, rebuilt 1961
Condition
Fair
inspected November 2023
Type
Arch - Deck
Masonry
Length
62 ft
2 main spans
Daily traffic
8,650
2023 count
Owner
State
State Highway Agency

About this bridge

South Main ST over Kent Creek is a masonry arch - deck carrying South Main ST over Kent Creek in Winnebago County, Illinois. It was built in 1905 and reconstructed in 1961, so it is 120 years old, older than the Illinois average of 45.3 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 8,650 vehicles a day, roughly 5% of them trucks, projected to reach 8,080 by 2046. The structure is 62 ft (18.9 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSouth Main ST
CrossesKent Creek
Location0.5 MI S of State ST
RouteState Highway 2
CountyWinnebago County
StateIllinois
Coordinates42.26416, -89.09975
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.9 US tons
Inventory rating97.9 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans2
Design loadUnknown
Structure length62 ft (18.9 m)
Longest span29 ft (8.8 m)
Deck width65 ft (19.7 m)
Roadway width49 ft (15 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,650 (2023)
Projected traffic8,080 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$528,000
NavigationNo navigation control on waterway

Frequently asked questions

When was South Main ST over Kent Creek built?

It was built in 1905, making it 120 years old in 2025. It was reconstructed in 1961.

What condition is South Main ST over Kent 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 November 2023.

How much traffic does South Main ST over Kent Creek carry?

About 8,650 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is South Main ST over Kent Creek?

The structure is 62 ft (18.9 m) long with a longest span of 29 ft (8.8 m) and a deck 65 ft wide.

Who owns South Main ST over Kent Creek?

It is owned by the State Highway Agency.