US Bridges

TR 108 over Mill Creek

Poor

Rock Island County, Illinois · 1 MI SE Milan · Structure no. 081305000000000

Built
1963
62 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
135 ft
3 main spans
Daily traffic
350
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

TR 108 over Mill Creek is a steel stringer/multi-beam or girder carrying TR 108 over Mill Creek in Rock Island County, Illinois. It was built in 1963, so it is 62 years old, older 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 350 vehicles a day, roughly 9% of them trucks, projected to reach 354 by 2046. The structure is 135 ft (41.1 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesTR 108
CrossesMill Creek
Location1 MI SE Milan
RouteCity Street 0
CountyRock Island County
StateIllinois
Coordinates41.42749, -90.54851
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length135 ft (41.1 m)
Longest span48 ft (14.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2020)
Projected traffic354 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 TR 108 over Mill Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is TR 108 over Mill 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 July 2024.

How much traffic does TR 108 over Mill Creek carry?

About 350 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is TR 108 over Mill Creek?

The structure is 135 ft (41.1 m) long with a longest span of 48 ft (14.6 m) and a deck 26 ft wide.

Who owns TR 108 over Mill Creek?

It is owned by the City or Municipal Highway Agency.