US Bridges

Charles ST over Keith Creek

FairPosted for load

Winnebago County, Illinois · 1.5 MI W Alpine RD · Structure no. 101011000000000

Built
1940
85 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
14,700
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Charles ST over Keith Creek is a concrete slab carrying Charles ST over Keith Creek in Winnebago County, Illinois. It was built in 1940, so it is 85 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 14,700 vehicles a day, roughly 3% of them trucks, projected to reach 13,130 by 2046. The structure is 29 ft (8.8 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCharles ST
CrossesKeith Creek
Location1.5 MI W Alpine RD
CountyWinnebago County
StateIllinois
Coordinates42.25993, -89.05621
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
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 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating22.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width60 ft (18.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,700 (2022)
Projected traffic13,130 by 2046
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$180,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Charles ST over Keith Creek built?

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

What condition is Charles 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 Charles ST over Keith Creek carry?

About 14,700 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Charles ST over Keith Creek?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 60 ft wide.

Who owns Charles ST over Keith Creek?

It is owned by the City or Municipal Highway Agency.