US Bridges

Il 29 (walnut ST R over Sangamon River

Fair

Sangamon County, Illinois · 2.6M N Il 4/VETERANS · Structure no. 084020700000000

Built
1997
28 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
876 ft
4 main spans
Daily traffic
6,950
2023 count
Owner
State
State Highway Agency

About this bridge

Il 29 (walnut ST R over Sangamon River is a steel continuous stringer/multi-beam or girder carrying Il 29 (walnut ST R over Sangamon River in Sangamon County, Illinois. It was built in 1997, so it is 28 years old, younger 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 6,950 vehicles a day, roughly 2% of them trucks, projected to reach 6,868 by 2046. The structure is 876 ft (266.9 m) long and 47 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIl 29 (walnut ST R
CrossesSangamon River
Location2.6M N Il 4/VETERANS
RouteState Highway 29
CountySangamon County
StateIllinois
Coordinates39.87326, -89.66433
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.7 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length876 ft (266.9 m)
Longest span270 ft (82.3 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,950 (2023)
Projected traffic6,868 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 29 (walnut ST R over Sangamon River built?

It was built in 1997, making it 28 years old in 2025.

What condition is Il 29 (walnut ST R over Sangamon 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 February 2025.

How much traffic does Il 29 (walnut ST R over Sangamon River carry?

About 6,950 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Il 29 (walnut ST R over Sangamon River?

The structure is 876 ft (266.9 m) long with a longest span of 270 ft (82.3 m) and a deck 47 ft wide.

Who owns Il 29 (walnut ST R over Sangamon River?

It is owned by the State Highway Agency.