US Bridges

Base Line RD over Lee Slough Creek

Fair

DeKalb County, Illinois · 3000N 885E · Structure no. 019410400000000

Built
1997
28 years old
Condition
Fair
inspected April 2024
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
1,100
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Base Line RD over Lee Slough Creek is a concrete channel beam carrying Base Line RD over Lee Slough Creek in DeKalb County, Illinois. It was built in 1997, so it is 28 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 1,100 vehicles a day, roughly 46% of them trucks, projected to reach 1,232 by 2046. The structure is 40 ft (12.1 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBase Line RD
CrossesLee Slough Creek
Location3000N 885E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates42.06635, -88.77638
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.1 m)
Longest span37 ft (11.4 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2021)
Projected traffic1,232 by 2046
Trucks46%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Base Line RD over Lee Slough Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Base Line RD over Lee Slough 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 April 2024.

How much traffic does Base Line RD over Lee Slough Creek carry?

About 1,100 vehicles per day (2021 count), of which roughly 46% are trucks.

How long is Base Line RD over Lee Slough Creek?

The structure is 40 ft (12.1 m) long with a longest span of 37 ft (11.4 m) and a deck 30 ft wide.

Who owns Base Line RD over Lee Slough Creek?

It is owned by the Town or Township Highway Agency.