US Bridges

Seminary Street over Cn RR

Fair

Winnebago County, Illinois · S Central Rockford · Structure no. 101994200000000

Built
1901
124 years old, rebuilt 2008
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
114 ft
8 main spans
Daily traffic
1,150
2022 count
Owner
Private
Private (other than railroad)

About this bridge

Seminary Street over Cn RR is a wood or timber stringer/multi-beam or girder carrying Seminary Street over Cn RR in Winnebago County, Illinois. It was built in 1901 and reconstructed in 2008, so it is 124 years old, older 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 5 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 1,150 vehicles a day, roughly 9% of them trucks, projected to reach 3,788 by 2046. The structure is 114 ft (34.6 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSeminary Street
CrossesCn RR
LocationS Central Rockford
CountyWinnebago County
StateIllinois
Coordinates42.25489, -89.09312
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56.1 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length114 ft (34.6 m)
Longest span24 ft (7.2 m)
Deck width55 ft (16.8 m)
Roadway width41 ft (12.5 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
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$723,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Seminary Street over Cn RR built?

It was built in 1901, making it 124 years old in 2025. It was reconstructed in 2008.

What condition is Seminary Street over Cn RR 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 July 2023.

How much traffic does Seminary Street over Cn RR carry?

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

How long is Seminary Street over Cn RR?

The structure is 114 ft (34.6 m) long with a longest span of 24 ft (7.2 m) and a deck 55 ft wide.

Who owns Seminary Street over Cn RR?

It is owned by the Private (other than railroad).