US Bridges

Il 29 over Mackinaw River Trib

Poor

Tazewell County, Illinois · 0.25 MI N Mackinaw R · Structure no. 090200200000000

Built
1963
62 years old
Condition
Poor
inspected May 2024
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
2,250
2023 count
Owner
State
State Highway Agency

About this bridge

Il 29 over Mackinaw River Trib is a concrete continuous culvert carrying Il 29 over Mackinaw River Trib in Tazewell 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 2,250 vehicles a day, roughly 16% of them trucks, projected to reach 2,677 by 2046. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesIl 29
CrossesMackinaw River Trib
Location0.25 MI N Mackinaw R
RouteState Highway 29
CountyTazewell County
StateIllinois
Coordinates40.44992, -89.65365
Functional classRural Minor Arterial

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
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.1 US tons
Inventory rating27.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,250 (2023)
Projected traffic2,677 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

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 29 over Mackinaw River Trib built?

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

What condition is Il 29 over Mackinaw River Trib 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 Il 29 over Mackinaw River Trib carry?

About 2,250 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is Il 29 over Mackinaw River Trib?

The structure is 32 ft (9.8 m) long with a longest span of 11 ft (3.5 m).

Who owns Il 29 over Mackinaw River Trib?

It is owned by the State Highway Agency.