US Bridges

County Highway 11 over Unnamed Creek

Fair

Rock Island County, Illinois · 4.92 MI S Ill 92 · Structure no. 081500000000000

Built
1901
124 years old
Condition
Fair
inspected November 2022
Type
Culvert
Concrete
Length
40 ft
4 main spans
Daily traffic
1,600
2020 count
Owner
County
County Highway Agency

About this bridge

County Highway 11 over Unnamed Creek is a concrete culvert carrying County Highway 11 over Unnamed Creek in Rock Island County, Illinois. It was built in 1901, so it is 124 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 1,600 vehicles a day, roughly 11% of them trucks, projected to reach 1,616 by 2046. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty Highway 11
CrossesUnnamed Creek
Location4.92 MI S Ill 92
RouteCounty Highway 0
CountyRock Island County
StateIllinois
Coordinates41.33708, -91.00753
Functional classRural 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
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.5 US tons
Inventory rating22.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2020)
Projected traffic1,616 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Highway 11 over Unnamed Creek built?

It was built in 1901, making it 124 years old in 2025.

What condition is County Highway 11 over Unnamed 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 2022.

How much traffic does County Highway 11 over Unnamed Creek carry?

About 1,600 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is County Highway 11 over Unnamed Creek?

The structure is 40 ft (12.2 m) long with a longest span of 10 ft (3 m).

Who owns County Highway 11 over Unnamed Creek?

It is owned by the County Highway Agency.