US Bridges

I 39 SB Ramp over Over Bypass 20

Good

Winnebago County, Illinois · 0.4 MI W of Mulford · Structure no. 101021500000000

Built
2024
1 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete
Length
484 ft
3 main spans
Daily traffic
12,600
2023 count
Owner
State
State Highway Agency

About this bridge

I 39 SB Ramp over Over Bypass 20 is a concrete slab carrying I 39 SB Ramp over Over Bypass 20 in Winnebago County, Illinois. It was built in 2024, so it is 1 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,600 vehicles a day, roughly 38% of them trucks, projected to reach 12,600 by 2044. The structure is 484 ft (147.5 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 39 SB Ramp
CrossesOver Bypass 20
Location0.4 MI W of Mulford
RouteInterstate 39
Coordinates42.21948, -89.00687
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating53.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckSteel plate
Main spans3 (+2 approach)
Design loadHS 20
Structure length484 ft (147.5 m)
Longest span183 ft (55.8 m)
Deck width55 ft (16.7 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,600 (2023)
Projected traffic12,600 by 2044
Trucks38%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 39 SB Ramp over Over Bypass 20 built?

It was built in 2024, making it 1 years old in 2025.

What condition is I 39 SB Ramp over Over Bypass 20 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does I 39 SB Ramp over Over Bypass 20 carry?

About 12,600 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I 39 SB Ramp over Over Bypass 20?

The structure is 484 ft (147.5 m) long with a longest span of 183 ft (55.8 m) and a deck 55 ft wide.

Who owns I 39 SB Ramp over Over Bypass 20?

It is owned by the State Highway Agency.