US Bridges

Ill 29 over Senachwine CR Trib

Good

Putnam County, Illinois · 1 MI N of Putnam · Structure no. 078000400000000

Built
1963
62 years old, rebuilt 2017
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
3,200
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 29 over Senachwine CR Trib is a prestressed concrete box beam or girders - multiple carrying Ill 29 over Senachwine CR Trib in Putnam County, Illinois. It was built in 1963 and reconstructed in 2017, so it is 62 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,200 vehicles a day, roughly 18% of them trucks, projected to reach 3,068 by 2046. The structure is 37 ft (11.4 m) long and 36 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesIll 29
CrossesSenachwine CR Trib
Location1 MI N of Putnam
RouteState Highway 29
Coordinates41.19876, -89.40128
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating81.8 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length37 ft (11.4 m)
Longest span36 ft (10.9 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2023)
Projected traffic3,068 by 2046
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 29 over Senachwine CR Trib built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2017.

What condition is Ill 29 over Senachwine CR Trib in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Ill 29 over Senachwine CR Trib carry?

About 3,200 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Ill 29 over Senachwine CR Trib?

The structure is 37 ft (11.4 m) long with a longest span of 36 ft (10.9 m) and a deck 36 ft wide.

Who owns Ill 29 over Senachwine CR Trib?

It is owned by the State Highway Agency.