US Bridges

78th Ave over Coal Creek

Fair

Rock Island County, Illinois · 1 MI W Coal Valley · Structure no. 081304600000000

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
71 ft
3 main spans
Daily traffic
800
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

78th Ave over Coal Creek is a concrete slab carrying 78th Ave over Coal Creek in Rock Island County, Illinois. It was built in 1966, so it is 59 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 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 800 vehicles a day, roughly 8% of them trucks, projected to reach 581 by 2046. The structure is 71 ft (21.6 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries78th Ave
CrossesCoal Creek
Location1 MI W Coal Valley
CountyRock Island County
StateIllinois
Coordinates41.44289, -90.48517
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length71 ft (21.6 m)
Longest span27 ft (8.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic581 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 78th Ave over Coal Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is 78th Ave over Coal 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 August 2024.

How much traffic does 78th Ave over Coal Creek carry?

About 800 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is 78th Ave over Coal Creek?

The structure is 71 ft (21.6 m) long with a longest span of 27 ft (8.2 m) and a deck 26 ft wide.

Who owns 78th Ave over Coal Creek?

It is owned by the City or Municipal Highway Agency.