Structure 90322900000000 · Tazewell County, IL

Fas 1481-ch 7 over Mackinaw River

Carries Fas 1481-ch 7 over Mackinaw River, Ne-1-t23nr6w.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT418 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

418 ft end to end, longest span 90 ft: about 6 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built200323 years old
Length418.3 ft127.5 m
Daily traffic1,150counted 2023
Last inspectedJanuary 2024every 48 months

Location

StateIllinois
CountyTazewell
LocationNe-1-t23nr6w
CarriesFas 1481-ch 7
CrossesMackinaw River
Coordinates40.47907, -89.72724

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length418.3 ft (127.5 m)
Max Span89.9 ft (27.4 m)
Deck Width29.9 ft (9.1 m)
Deck Area1160.2 sq m
Main Spans5
Year Built2003

Traffic

Avg Daily Traffic1,150 (2023)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 48 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number090322900000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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