US Bridges

Mill Street over Clark Run Creek

Poor

LaSalle County, Illinois · 35 N/Grove S · Structure no. 050720000000000

Built
2002
23 years old
Condition
Poor
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
400
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Street over Clark Run Creek is a prestressed concrete box beam or girders - multiple carrying Mill Street over Clark Run Creek in LaSalle County, Illinois. It was built in 2002, so it is 23 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 400 vehicles a day, roughly 12% of them trucks, projected to reach 404 by 2046. The structure is 38 ft (11.6 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMill Street
CrossesClark Run Creek
Location35 N/Grove S
RouteCity Street 0
Coordinates41.34219, -89.00937
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span35 ft (10.8 m)
Deck width58 ft (17.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2020)
Projected traffic404 by 2046
Trucks12%
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 Mill Street over Clark Run Creek built?

It was built in 2002, making it 23 years old in 2025.

What condition is Mill Street over Clark Run Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Mill Street over Clark Run Creek carry?

About 400 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Mill Street over Clark Run Creek?

The structure is 38 ft (11.6 m) long with a longest span of 35 ft (10.8 m) and a deck 58 ft wide.

Who owns Mill Street over Clark Run Creek?

It is owned by the City or Municipal Highway Agency.