US Bridges

TR 149B over Lake Branch

Fair

Clinton County, Illinois · .5 MI E Aviston · Structure no. 014307000000000

Built
1965
60 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
70 ft
3 main spans
Daily traffic
300
2020 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 149B over Lake Branch is a concrete channel beam carrying TR 149B over Lake Branch in Clinton County, Illinois. It was built in 1965, so it is 60 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.

It carries about 300 vehicles a day, roughly 23% of them trucks, projected to reach 330 by 2046. The structure is 70 ft (21.3 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTR 149B
CrossesLake Branch
Location.5 MI E Aviston
RouteCounty Highway 0
CountyClinton County
StateIllinois
Coordinates38.60384, -89.59394
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span30 ft (9.1 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2020)
Projected traffic330 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$277,000
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 149B over Lake Branch built?

It was built in 1965, making it 60 years old in 2025.

What condition is TR 149B over Lake 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 October 2023.

How much traffic does TR 149B over Lake Branch carry?

About 300 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is TR 149B over Lake Branch?

The structure is 70 ft (21.3 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns TR 149B over Lake Branch?

It is owned by the Town or Township Highway Agency.