US Bridges

US 20 & Private RD over Silver Creek Trib

Fair

Stephenson County, Illinois · 4 MI E of Freeport · Structure no. 089200000000000

Built
1959
66 years old, rebuilt 1986
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
12,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 & Private RD over Silver Creek Trib is a concrete culvert carrying US 20 & Private RD over Silver Creek Trib in Stephenson County, Illinois. It was built in 1959 and reconstructed in 1986, so it is 66 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 12,700 vehicles a day, roughly 16% of them trucks, projected to reach 14,039 by 2046. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 20 & Private RD
CrossesSilver Creek Trib
Location4 MI E of Freeport
RouteU.S. Route 20
Coordinates42.27588, -89.52604
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating59.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length30 ft (9.1 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,700 (2023)
Projected traffic14,039 by 2046
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 & Private RD over Silver Creek Trib built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1986.

What condition is US 20 & Private RD over Silver Creek Trib 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 2023.

How much traffic does US 20 & Private RD over Silver Creek Trib carry?

About 12,700 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is US 20 & Private RD over Silver Creek Trib?

The structure is 30 ft (9.1 m) long with a longest span of 13 ft (3.9 m).

Who owns US 20 & Private RD over Silver Creek Trib?

It is owned by the State Highway Agency.