US Bridges

TR-105 Crosby RD over Rock Creek

Fair

Whiteside County, Illinois · .5M NW Morrison · Structure no. 098506100000000

Built
2001
24 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
140 ft
2 main spans
Daily traffic
650
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-105 Crosby RD over Rock Creek is a steel stringer/multi-beam or girder carrying TR-105 Crosby RD over Rock Creek in Whiteside County, Illinois. It was built in 2001, so it is 24 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 5 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 650 vehicles a day, roughly 23% of them trucks, projected to reach 657 by 2046. The structure is 140 ft (42.7 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesTR-105 Crosby RD
CrossesRock Creek
Location.5M NW Morrison
RouteCounty Highway 0
CountyWhiteside County
StateIllinois
Coordinates41.8186, -89.96811
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans2
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span87 ft (26.6 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2021)
Projected traffic657 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 TR-105 Crosby RD over Rock Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is TR-105 Crosby RD 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 May 2024.

How much traffic does TR-105 Crosby RD over Rock Creek carry?

About 650 vehicles per day (2021 count), of which roughly 23% are trucks.

How long is TR-105 Crosby RD over Rock Creek?

The structure is 140 ft (42.7 m) long with a longest span of 87 ft (26.6 m) and a deck 32 ft wide.

Who owns TR-105 Crosby RD over Rock Creek?

It is owned by the Town or Township Highway Agency.