US Bridges

TR 121A (200 N) over I-39/US 51

Fair

Marshall County, Illinois · 5 MI S of Il 17 · Structure no. 062005500000000

Built
1990
35 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
3 main spans
Daily traffic
75
2024 count
Owner
State
State Highway Agency

About this bridge

TR 121A (200 N) over I-39/US 51 is a steel continuous stringer/multi-beam or girder carrying TR 121A (200 N) over I-39/US 51 in Marshall County, Illinois. It was built in 1990, so it is 35 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 5 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 75 vehicles a day, roughly 27% of them trucks, projected to reach 76 by 2046. The structure is 228 ft (69.5 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesTR 121A (200 N)
CrossesI-39/US 51
Location5 MI S of Il 17
RouteCounty Highway 0
CountyMarshall County
StateIllinois
Coordinates40.95504, -89.05637
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.6 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length228 ft (69.5 m)
Longest span166 ft (50.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2024)
Projected traffic76 by 2046
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 TR 121A (200 N) over I-39/US 51 built?

It was built in 1990, making it 35 years old in 2025.

What condition is TR 121A (200 N) over I-39/US 51 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 March 2023.

How much traffic does TR 121A (200 N) over I-39/US 51 carry?

About 75 vehicles per day (2024 count), of which roughly 27% are trucks.

How long is TR 121A (200 N) over I-39/US 51?

The structure is 228 ft (69.5 m) long with a longest span of 166 ft (50.5 m) and a deck 31 ft wide.

Who owns TR 121A (200 N) over I-39/US 51?

It is owned by the State Highway Agency.