US Bridges

Seminary ST over Keith Creek

Good

Winnebago County, Illinois · 0.5 MI N of 15th Ave · Structure no. 101607400000000

Built
2021
4 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
1,150
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Seminary ST over Keith Creek is a prestressed concrete stringer/multi-beam or girder carrying Seminary ST over Keith Creek in Winnebago County, Illinois. It was built in 2021, so it is 4 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 1,150 vehicles a day, roughly 9% of them trucks, projected to reach 3,788 by 2046. The structure is 95 ft (29 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSeminary ST
CrossesKeith Creek
Location0.5 MI N of 15th Ave
Coordinates42.2564, -89.09223
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating43.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length95 ft (29 m)
Longest span91 ft (27.7 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2022)
Projected traffic3,788 by 2046
Trucks9%
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 Seminary ST over Keith Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is Seminary ST over Keith Creek 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 October 2023.

How much traffic does Seminary ST over Keith Creek carry?

About 1,150 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Seminary ST over Keith Creek?

The structure is 95 ft (29 m) long with a longest span of 91 ft (27.7 m) and a deck 52 ft wide.

Who owns Seminary ST over Keith Creek?

It is owned by the City or Municipal Highway Agency.