US Bridges

20th ST over Keith Creek

FairPosted for load

Winnebago County, Illinois · 0.02 MI S Charles · Structure no. 101605700000000

Built
1928
97 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
30 ft
1 main span
Daily traffic
7,750
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

20th ST over Keith Creek is a concrete slab carrying 20th ST over Keith Creek in Winnebago County, Illinois. It was built in 1928, so it is 97 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. Its operating status is: posted for load restriction.

It carries about 7,750 vehicles a day, roughly 2% of them trucks, projected to reach 7,121 by 2046. The structure is 30 ft (9.1 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries20th ST
CrossesKeith Creek
Location0.02 MI S Charles
CountyWinnebago County
StateIllinois
Coordinates42.25923, -89.05759
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
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width65 ft (19.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,750 (2022)
Projected traffic7,121 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 20th ST over Keith Creek built?

It was built in 1928, making it 97 years old in 2025.

What condition is 20th ST over Keith 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 October 2023.

How much traffic does 20th ST over Keith Creek carry?

About 7,750 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 20th ST over Keith Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 65 ft wide.

Who owns 20th ST over Keith Creek?

It is owned by the City or Municipal Highway Agency.