US Bridges

FAS-461 (CH-16) over Mackinaw River over

Poor

Tazewell County, Illinois · SW-8-T24NR6W · Structure no. 090300000000000

Built
1940
85 years old, rebuilt 1987
Condition
Poor
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
168 ft
3 main spans
Daily traffic
3,950
2023 count
Owner
County
County Highway Agency

About this bridge

FAS-461 (CH-16) over Mackinaw River over is a steel stringer/multi-beam or girder carrying FAS-461 (CH-16) over Mackinaw River over in Tazewell County, Illinois. It was built in 1940 and reconstructed in 1987, so it is 85 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 3,950 vehicles a day, roughly 10% of them trucks, projected to reach 4,091 by 2046. The structure is 168 ft (51.1 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFAS-461 (CH-16)
CrossesMackinaw River over
LocationSW-8-T24NR6W
RouteCounty Highway 0
Coordinates40.53791, -89.69961
Functional classUrban Collector

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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating27.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length168 ft (51.1 m)
Longest span64 ft (19.6 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,950 (2023)
Projected traffic4,091 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$572,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS-461 (CH-16) over Mackinaw River over built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1987.

What condition is FAS-461 (CH-16) over Mackinaw River over 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 January 2024.

How much traffic does FAS-461 (CH-16) over Mackinaw River over carry?

About 3,950 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is FAS-461 (CH-16) over Mackinaw River over?

The structure is 168 ft (51.1 m) long with a longest span of 64 ft (19.6 m) and a deck 31 ft wide.

Who owns FAS-461 (CH-16) over Mackinaw River over?

It is owned by the County Highway Agency.