US Bridges

TR-75 (oliver Road over Tunnison Creek

FairPosted for load

Winnebago County, Illinois · 0.5 MI N Knapp Road · Structure no. 101505300000000

Built
1961
64 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
50
2017 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-75 (oliver Road over Tunnison Creek is a concrete continuous culvert carrying TR-75 (oliver Road over Tunnison Creek in Winnebago County, Illinois. It was built in 1961, so it is 64 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 51 by 2046. The structure is 39 ft (11.8 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesTR-75 (oliver Road
CrossesTunnison Creek
Location0.5 MI N Knapp Road
RouteCounty Highway 0
CountyWinnebago County
StateIllinois
Coordinates42.38525, -89.21873
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19.6 US tons
Inventory rating11.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 15
Structure length39 ft (11.8 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 traffic50 (2017)
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 TR-75 (oliver Road over Tunnison Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is TR-75 (oliver Road over Tunnison 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 July 2024.

How much traffic does TR-75 (oliver Road over Tunnison Creek carry?

About 50 vehicles per day (2017 count).

How long is TR-75 (oliver Road over Tunnison Creek?

The structure is 39 ft (11.8 m) long with a longest span of 13 ft (3.9 m).

Who owns TR-75 (oliver Road over Tunnison Creek?

It is owned by the Town or Township Highway Agency.