US Bridges

Oak Grove Avenue over Unnamed Creek

Fair

Whiteside County, Illinois · 0.3 M S of ST Marys · Structure no. 098555400000000

Built
1982
43 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
950
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Oak Grove Avenue over Unnamed Creek is a concrete culvert carrying Oak Grove Avenue over Unnamed Creek in Whiteside County, Illinois. It was built in 1982, so it is 43 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 950 vehicles a day, roughly 4% of them trucks, projected to reach 960 by 2046. The structure is 26 ft (7.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesOak Grove Avenue
CrossesUnnamed Creek
Location0.3 M S of ST Marys
RouteCity Street 0
Coordinates41.80378, -89.71362
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span9 ft (2.6 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (2021)
Projected traffic960 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Oak Grove Avenue over Unnamed Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is Oak Grove Avenue over Unnamed 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 December 2024.

How much traffic does Oak Grove Avenue over Unnamed Creek carry?

About 950 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Oak Grove Avenue over Unnamed Creek?

The structure is 26 ft (7.9 m) long with a longest span of 9 ft (2.6 m) and a deck 41 ft wide.

Who owns Oak Grove Avenue over Unnamed Creek?

It is owned by the City or Municipal Highway Agency.