US Bridges

TR 21B over Missouri Creek

Fair

Brown County, Illinois · 6.0 MI N Timewell · Structure no. 005370100000000

Built
1981
44 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
91 ft
2 main spans
Daily traffic
100
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 21B over Missouri Creek is a prestressed concrete box beam or girders - multiple carrying TR 21B over Missouri Creek in Brown County, Illinois. It was built in 1981, so it is 44 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 101 by 2046. The structure is 91 ft (27.7 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTR 21B
CrossesMissouri Creek
Location6.0 MI N Timewell
RouteCounty Highway 0
CountyBrown County
StateIllinois
Coordinates40.09071, -90.88872
Functional classRural Minor Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length91 ft (27.7 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic101 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 21B over Missouri Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is TR 21B over Missouri Creek 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 21B over Missouri Creek carry?

About 100 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is TR 21B over Missouri Creek?

The structure is 91 ft (27.7 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns TR 21B over Missouri Creek?

It is owned by the Town or Township Highway Agency.