US Bridges

Il 71 FAP 311 over Mission Creek

Good

LaSalle County, Illinois · 1.65 MI N of US 52 · Structure no. 050204700000000

Built
2010
15 years old
Condition
Good
inspected February 2021
Type
Culvert
Concrete
Length
56 ft
3 main spans
Daily traffic
5,100
2023 count
Owner
State
State Highway Agency

About this bridge

Il 71 FAP 311 over Mission Creek is a concrete culvert carrying Il 71 FAP 311 over Mission Creek in LaSalle County, Illinois. It was built in 2010, so it is 15 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 5,100 vehicles a day, roughly 12% of them trucks, projected to reach 4,949 by 2046. The structure is 56 ft (17.1 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 71 FAP 311
CrossesMission Creek
Location1.65 MI N of US 52
RouteState Highway 71
CountyLaSalle County
StateIllinois
Coordinates41.50681, -88.62993
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span12 ft (3.7 m)
Deck width72 ft (21.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,100 (2023)
Projected traffic4,949 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 71 FAP 311 over Mission Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Il 71 FAP 311 over Mission 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 February 2021.

How much traffic does Il 71 FAP 311 over Mission Creek carry?

About 5,100 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Il 71 FAP 311 over Mission Creek?

The structure is 56 ft (17.1 m) long with a longest span of 12 ft (3.7 m) and a deck 72 ft wide.

Who owns Il 71 FAP 311 over Mission Creek?

It is owned by the State Highway Agency.