US Bridges

Lyndon Road over Rock Creek

Fair

Whiteside County, Illinois · 3.5 MI NE Morrison · Structure no. 098307700000000

Built
2010
15 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
139 ft
3 main spans
Daily traffic
725
2021 count
Owner
County
County Highway Agency

About this bridge

Lyndon Road over Rock Creek is a prestressed concrete box beam or girders - multiple carrying Lyndon Road over Rock Creek in Whiteside County, Illinois. It was built in 2010, so it is 15 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 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 725 vehicles a day, roughly 15% of them trucks, projected to reach 732 by 2046. The structure is 139 ft (42.4 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLyndon Road
CrossesRock Creek
Location3.5 MI NE Morrison
RouteCounty Highway 0
CountyWhiteside County
StateIllinois
Coordinates41.86229, -89.92034
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 25 or greater
Structure length139 ft (42.4 m)
Longest span54 ft (16.6 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic725 (2021)
Projected traffic732 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Lyndon Road over Rock Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Lyndon Road over Rock 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 September 2024.

How much traffic does Lyndon Road over Rock Creek carry?

About 725 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Lyndon Road over Rock Creek?

The structure is 139 ft (42.4 m) long with a longest span of 54 ft (16.6 m) and a deck 30 ft wide.

Who owns Lyndon Road over Rock Creek?

It is owned by the County Highway Agency.