US Bridges

US 51 over Cache Creek

Fair

Union County, Illinois · 2 MI N Anna · Structure no. 091002200000000

Built
1964
61 years old, rebuilt 2009
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
5,950
2023 count
Owner
State
State Highway Agency

About this bridge

US 51 over Cache Creek is a steel stringer/multi-beam or girder carrying US 51 over Cache Creek in Union County, Illinois. It was built in 1964 and reconstructed in 2009, so it is 61 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 6 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 5,950 vehicles a day, roughly 12% of them trucks, projected to reach 5,353 by 2046. The structure is 41 ft (12.4 m) long and 43 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS 51
CrossesCache Creek
Location2 MI N Anna
RouteU.S. Route 51
CountyUnion County
StateIllinois
Coordinates37.50312, -89.23176
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length41 ft (12.4 m)
Longest span38 ft (11.5 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,950 (2023)
Projected traffic5,353 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes

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 US 51 over Cache Creek built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2009.

What condition is US 51 over Cache 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 July 2024.

How much traffic does US 51 over Cache Creek carry?

About 5,950 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 51 over Cache Creek?

The structure is 41 ft (12.4 m) long with a longest span of 38 ft (11.5 m) and a deck 43 ft wide.

Who owns US 51 over Cache Creek?

It is owned by the State Highway Agency.