US Bridges

Forest Hills RD SB over Il 251 NB

Good

Winnebago County, Illinois · In Rockford · Structure no. 101012300000000

Built
1971
54 years old, rebuilt 2011
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
333 ft
3 main spans
Daily traffic
8,750
2022 count
Owner
State
State Highway Agency

About this bridge

Forest Hills RD SB over Il 251 NB is a steel continuous stringer/multi-beam or girder carrying Forest Hills RD SB over Il 251 NB in Winnebago County, Illinois. It was built in 1971 and reconstructed in 2011, so it is 54 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,750 vehicles a day, roughly 4% of them trucks, projected to reach 9,848 by 2046. The structure is 333 ft (101.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesForest Hills RD SB
CrossesIl 251 NB
LocationIn Rockford
CountyWinnebago County
StateIllinois
Coordinates42.2966, -89.05709
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length333 ft (101.4 m)
Longest span127 ft (38.6 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,750 (2022)
Projected traffic9,848 by 2046
Trucks4%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Forest Hills RD SB over Il 251 NB built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2011.

What condition is Forest Hills RD SB over Il 251 NB 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 September 2023.

How much traffic does Forest Hills RD SB over Il 251 NB carry?

About 8,750 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Forest Hills RD SB over Il 251 NB?

The structure is 333 ft (101.4 m) long with a longest span of 127 ft (38.6 m) and a deck 29 ft wide.

Who owns Forest Hills RD SB over Il 251 NB?

It is owned by the State Highway Agency.