US Bridges

24th ST Rock Islan over Stream

Fair

Rock Island County, Illinois · .1MI N of Ill 5 · Structure no. 081008800000000

Built
1934
91 years old, rebuilt 2005
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
7,700
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

24th ST Rock Islan over Stream is a prestressed concrete box beam or girders - multiple carrying 24th ST Rock Islan over Stream in Rock Island County, Illinois. It was built in 1934 and reconstructed in 2005, so it is 91 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 7,700 vehicles a day, roughly 3% of them trucks, projected to reach 6,363 by 2046. The structure is 43 ft (13 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries24th ST Rock Islan
CrossesStream
Location.1MI N of Ill 5
CountyRock Island County
StateIllinois
Coordinates41.4659, -90.56553
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length43 ft (13 m)
Longest span41 ft (12.6 m)
Deck width35 ft (10.7 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,700 (2023)
Projected traffic6,363 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$240,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 24th ST Rock Islan over Stream built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 2005.

What condition is 24th ST Rock Islan over Stream 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 March 2024.

How much traffic does 24th ST Rock Islan over Stream carry?

About 7,700 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is 24th ST Rock Islan over Stream?

The structure is 43 ft (13 m) long with a longest span of 41 ft (12.6 m) and a deck 35 ft wide.

Who owns 24th ST Rock Islan over Stream?

It is owned by the City or Municipal Highway Agency.