US Bridges

I-55 over Hoover Branch

Fair

Sangamon County, Illinois · .85M S Sang Av/Il 54 · Structure no. 084200000000000

Built
1961
64 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
19,650
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 over Hoover Branch is a concrete culvert carrying I-55 over Hoover Branch in Sangamon County, Illinois. It was built in 1961, so it is 64 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 19,650 vehicles a day, roughly 25% of them trucks, projected to reach 19,089 by 2046. The structure is 26 ft (7.8 m) long.

Location

Open in Google Maps
CarriesI-55
CrossesHoover Branch
Location.85M S Sang Av/Il 54
RouteInterstate 55
CountySangamon County
StateIllinois
Coordinates39.81996, -89.59256
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length26 ft (7.8 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,650 (2023)
Projected traffic19,089 by 2046
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-55 over Hoover Branch built?

It was built in 1961, making it 64 years old in 2025.

What condition is I-55 over Hoover Branch 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 2024.

How much traffic does I-55 over Hoover Branch carry?

About 19,650 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-55 over Hoover Branch?

The structure is 26 ft (7.8 m) long with a longest span of 11 ft (3.4 m).

Who owns I-55 over Hoover Branch?

It is owned by the State Highway Agency.