US Bridges

US 20 Br over Beaver Creek

Fair

Boone County, Illinois · 2.5 MI W Belvidere · Structure no. 004000100000000

Built
1957
68 years old, rebuilt 1983
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
237 ft
4 main spans
Daily traffic
13,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Br over Beaver Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying US 20 Br over Beaver Creek in Boone County, Illinois. It was built in 1957 and reconstructed in 1983, so it is 68 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 13,400 vehicles a day, roughly 4% of them trucks, projected to reach 12,792 by 2046. The structure is 237 ft (72.1 m) long and 43 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesUS 20 Br
CrossesBeaver Creek
Location2.5 MI W Belvidere
RouteU.S. Route 20
CountyBoone County
StateIllinois
Coordinates42.27613, -88.91563
Functional classUrban Other Principal Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.5 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length237 ft (72.1 m)
Longest span71 ft (21.7 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,400 (2023)
Projected traffic12,792 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 20 Br over Beaver Creek built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1983.

What condition is US 20 Br over Beaver 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 June 2024.

How much traffic does US 20 Br over Beaver Creek carry?

About 13,400 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 20 Br over Beaver Creek?

The structure is 237 ft (72.1 m) long with a longest span of 71 ft (21.7 m) and a deck 43 ft wide.

Who owns US 20 Br over Beaver Creek?

It is owned by the State Highway Agency.