Structure 65000400000000 · Menard County, IL

Ill 97 over Tar Creek

Carries Ill 97 over Tar Creek, .5 Mi N Oakford.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · 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 FT147 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

147 ft end to end, longest span 56 ft: about 2 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.

Built1938rebuilt 1988
Length146.7 ft44.7 m
Daily traffic1,750counted 2023
Last inspectedOctober 2023every 24 months

Location

StateIllinois
CountyMenard
Location.5 Mi N Oakford
CarriesIll 97
CrossesTar Creek
Coordinates40.11314, -89.96963

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length146.7 ft (44.7 m)
Max Span55.8 ft (17 m)
Deck Width35.1 ft (10.7 m)
Deck Area478.3 sq m
Main Spans3
Year Built1938 (reconstructed 1988)

Traffic

Avg Daily Traffic1,750 (2023)
Truck Traffic17%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number065000400000000

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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