US Bridges

317th ST N over I-88

Fair

Rock Island County, Illinois · 1.0 Mi. N.Hillsdale · Structure no. 081013200000000

Built
1976
49 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
298 ft
2 main spans
Daily traffic
275
2020 count
Owner
State
State Highway Agency

About this bridge

317th ST N over I-88 is a steel continuous stringer/multi-beam or girder carrying 317th ST N over I-88 in Rock Island County, Illinois. It was built in 1976, so it is 49 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 275 vehicles a day, roughly 25% of them trucks, projected to reach 278 by 2046. The structure is 298 ft (90.8 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries317th ST N
CrossesI-88
Location1.0 Mi. N.Hillsdale
RouteCounty Highway 0
CountyRock Island County
StateIllinois
Coordinates41.63055, -90.1849
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.7 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length298 ft (90.8 m)
Longest span120 ft (36.6 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2020)
Projected traffic278 by 2046
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 317th ST N over I-88 built?

It was built in 1976, making it 49 years old in 2025.

What condition is 317th ST N over I-88 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 January 2024.

How much traffic does 317th ST N over I-88 carry?

About 275 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is 317th ST N over I-88?

The structure is 298 ft (90.8 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.

Who owns 317th ST N over I-88?

It is owned by the State Highway Agency.