US Bridges

Ch 30 over Trib Spring Creek

Fair

Iroquois County, Illinois · 2 MI W ILL49 · Structure no. 038390700000000

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
97 ft
3 main spans
Daily traffic
75
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 30 over Trib Spring Creek is a concrete channel beam carrying Ch 30 over Trib Spring Creek in Iroquois County, Illinois. It was built in 1975, so it is 50 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 75 vehicles a day, projected to reach 76 by 2046. The structure is 97 ft (29.6 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCh 30
CrossesTrib Spring Creek
Location2 MI W ILL49
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.80068, -87.89967
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length97 ft (29.6 m)
Longest span32 ft (9.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic76 by 2046
Trucks0%
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 Ch 30 over Trib Spring Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Ch 30 over Trib Spring 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 October 2023.

How much traffic does Ch 30 over Trib Spring Creek carry?

About 75 vehicles per day (2022 count).

How long is Ch 30 over Trib Spring Creek?

The structure is 97 ft (29.6 m) long with a longest span of 32 ft (9.8 m) and a deck 30 ft wide.

Who owns Ch 30 over Trib Spring Creek?

It is owned by the County Highway Agency.