US Bridges

Ch 29 over Langan CR

Fair

Iroquois County, Illinois · 1.5 MI W 1.5 N Clift · Structure no. 038360400000000

Built
1975
50 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
94 ft
3 main spans
Daily traffic
200
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 29 over Langan CR is a concrete slab carrying Ch 29 over Langan CR 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 200 vehicles a day, roughly 18% of them trucks, projected to reach 303 by 2046. The structure is 94 ft (28.7 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCh 29
CrossesLangan CR
Location1.5 MI W 1.5 N Clift
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.95711, -87.96144
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length94 ft (28.7 m)
Longest span32 ft (9.8 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2022)
Projected traffic303 by 2046
Trucks18%
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

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 29 over Langan CR built?

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

What condition is Ch 29 over Langan CR 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 September 2023.

How much traffic does Ch 29 over Langan CR carry?

About 200 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is Ch 29 over Langan CR?

The structure is 94 ft (28.7 m) long with a longest span of 32 ft (9.8 m) and a deck 26 ft wide.

Who owns Ch 29 over Langan CR?

It is owned by the County Highway Agency.