US Bridges

Dean Road over Rock Run Creek

Fair

Stephenson County, Illinois · 1.2 M W of Davis · Structure no. 089319300000000

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
50
2014 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Dean Road over Rock Run Creek is a prestressed concrete box beam or girders - multiple carrying Dean Road over Rock Run Creek in Stephenson County, Illinois. It was built in 1964, so it is 61 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 50 vehicles a day, projected to reach 51 by 2046. The structure is 54 ft (16.5 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDean Road
CrossesRock Run Creek
Location1.2 M W of Davis
RouteCounty Highway 0
CountyStephenson County
StateIllinois
Coordinates42.42361, -89.44266
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length54 ft (16.5 m)
Longest span53 ft (16.2 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2014)
Projected traffic51 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Dean Road over Rock Run Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Dean Road over Rock Run 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 October 2024.

How much traffic does Dean Road over Rock Run Creek carry?

About 50 vehicles per day (2014 count).

How long is Dean Road over Rock Run Creek?

The structure is 54 ft (16.5 m) long with a longest span of 53 ft (16.2 m) and a deck 22 ft wide.

Who owns Dean Road over Rock Run Creek?

It is owned by the Town or Township Highway Agency.