US Bridges

TR 77 over Oak CR

FairPosted for load

Adams County, Illinois · 2 MI NW Marcelline · Structure no. 001336400000000

Built
1900
125 years old, rebuilt 1984
Condition
Fair
inspected March 2024
Type
Truss - Thru
Steel
Length
80 ft
1 main span
Daily traffic
50
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 77 over Oak CR is a steel truss - thru carrying TR 77 over Oak CR in Adams County, Illinois. It was built in 1900 and reconstructed in 1984, so it is 125 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 51 by 2046. The structure is 80 ft (24.4 m) long and 15 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR 77
CrossesOak CR
Location2 MI NW Marcelline
RouteCounty Highway 0
CountyAdams County
StateIllinois
Coordinates40.13272, -91.39244
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating17.5 US tons
Inventory rating12.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length80 ft (24.4 m)
Longest span78 ft (23.8 m)
Deck width15 ft (4.7 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic51 by 2046
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$164,000
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 77 over Oak CR built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1984.

What condition is TR 77 over Oak CR 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 2024.

How much traffic does TR 77 over Oak CR carry?

About 50 vehicles per day (2024 count).

How long is TR 77 over Oak CR?

The structure is 80 ft (24.4 m) long with a longest span of 78 ft (23.8 m) and a deck 15 ft wide.

Who owns TR 77 over Oak CR?

It is owned by the Town or Township Highway Agency.