US Bridges

I-172 over Dry Branch

Fair

Adams County, Illinois · 0.70 MI S US 24 · Structure no. 001201300000000

Built
1975
50 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
34 ft
2 main spans
Daily traffic
7,350
2023 count
Owner
State
State Highway Agency

About this bridge

I-172 over Dry Branch is a concrete continuous culvert carrying I-172 over Dry Branch in Adams County, Illinois. It was built in 1975, so it is 50 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.

It carries about 7,350 vehicles a day, roughly 11% of them trucks, projected to reach 7,474 by 2046. The structure is 34 ft (10.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-172
CrossesDry Branch
Location0.70 MI S US 24
RouteInterstate 172
CountyAdams County
StateIllinois
Coordinates39.99739, -91.30538
Functional classRural Principal Arterial - Interstate

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating98.2 US tons
Inventory rating98.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length34 ft (10.5 m)
Longest span14 ft (4.4 m)
Deck width0 ft (0 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,350 (2023)
Projected traffic7,474 by 2046
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-172 over Dry Branch built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-172 over Dry Branch 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 2023.

How much traffic does I-172 over Dry Branch carry?

About 7,350 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-172 over Dry Branch?

The structure is 34 ft (10.5 m) long with a longest span of 14 ft (4.4 m).

Who owns I-172 over Dry Branch?

It is owned by the State Highway Agency.