US Bridges

Beloit RD over Beaver Creek

Good

Boone County, Illinois · 3.5 MI NW Belvidere · Structure no. 004306900000000

Built
1978
47 years old
Condition
Good
inspected July 2023
Type
Girder and Floorbeam System
Concrete
Length
145 ft
3 main spans
Daily traffic
3,800
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Beloit RD over Beaver Creek is a concrete girder and floorbeam system carrying Beloit RD over Beaver Creek in Boone County, Illinois. It was built in 1978, so it is 47 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,800 vehicles a day, roughly 4% of them trucks, projected to reach 3,588 by 2046. The structure is 145 ft (44.2 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBeloit RD
CrossesBeaver Creek
Location3.5 MI NW Belvidere
Coordinates42.31746, -88.88156
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span46 ft (14 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2023)
Projected traffic3,588 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Beloit RD over Beaver Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Beloit RD over Beaver Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Beloit RD over Beaver Creek carry?

About 3,800 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Beloit RD over Beaver Creek?

The structure is 145 ft (44.2 m) long with a longest span of 46 ft (14 m) and a deck 32 ft wide.

Who owns Beloit RD over Beaver Creek?

It is owned by the Town or Township Highway Agency.