US Bridges

TR 17 over I-55

Poor

Montgomery County, Illinois · 3.05M S Sangamon Co. · Structure no. 068003600000000

Built
1970
55 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
339 ft
3 main spans
Daily traffic
50
2020 count
Owner
State
State Highway Agency

About this bridge

TR 17 over I-55 is a steel continuous stringer/multi-beam or girder carrying TR 17 over I-55 in Montgomery County, Illinois. It was built in 1970, so it is 55 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 50 vehicles a day, roughly 60% of them trucks, projected to reach 51 by 2046. The structure is 339 ft (103.3 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesTR 17
CrossesI-55
Location3.05M S Sangamon Co.
RouteCounty Highway 0
CountyMontgomery County
StateIllinois
Coordinates39.47988, -89.64557
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 15
Structure length339 ft (103.3 m)
Longest span109 ft (33.2 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2020)
Projected traffic51 by 2046
Trucks60%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was TR 17 over I-55 built?

It was built in 1970, making it 55 years old in 2025.

What condition is TR 17 over I-55 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does TR 17 over I-55 carry?

About 50 vehicles per day (2020 count), of which roughly 60% are trucks.

How long is TR 17 over I-55?

The structure is 339 ft (103.3 m) long with a longest span of 109 ft (33.2 m) and a deck 30 ft wide.

Who owns TR 17 over I-55?

It is owned by the State Highway Agency.