US Bridges

US 30 over Mississippi River

Fair

Whiteside County, Illinois · 1 MI W of Ill 84 · Structure no. 098600300000000

Built
1956
69 years old, rebuilt 1999
Condition
Fair
inspected November 2024
Type
Suspension
Steel
Length
4,165 ft
1 main span
Daily traffic
9,650
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over Mississippi River is a steel suspension carrying US 30 over Mississippi River in Whiteside County, Illinois. It was built in 1956 and reconstructed in 1999, so it is 69 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 9,650 vehicles a day, roughly 13% of them trucks, projected to reach 11,716 by 2046. The structure is 4,165 ft (1,269.5 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 30
CrossesMississippi River
Location1 MI W of Ill 84
RouteU.S. Route 30
CountyWhiteside County
StateIllinois
Coordinates41.83788, -90.17369
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment7: Better than present minimum criteria
Operating rating47.2 US tons
Inventory rating26.8 US tons

Structure

Structure typeSuspension
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+30 approach)
Design loadHS 20
Structure length4,165 ft (1,269.5 m)
Longest span644 ft (196.3 m)
Deck width33 ft (10 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,650 (2023)
Projected traffic11,716 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$27.9 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 30 over Mississippi River built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1999.

What condition is US 30 over Mississippi River 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 2024.

How much traffic does US 30 over Mississippi River carry?

About 9,650 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is US 30 over Mississippi River?

The structure is 4,165 ft (1,269.5 m) long with a longest span of 644 ft (196.3 m) and a deck 33 ft wide.

Who owns US 30 over Mississippi River?

It is owned by the State Highway Agency.