Structure 58503700000000 · Macon County, IL

Tr 1a(lake Fork RD over Stream

Carries Tr 1a(lake Fork RD over Stream, 5.3 Mi NW Of Argenta.

Overall conditionFair

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

How ratings work
Culvertsets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
24 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 6/9

A culvert 24 ft across with 2 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built199135 years old
Length23.6 ft7.2 m
Daily traffic75counted 2020
Last inspectedJanuary 2024every 24 months

Location

StateIllinois
CountyMacon
Location5.3 Mi NW Of Argenta
CarriesTr 1a(lake Fork RD
CrossesStream
Coordinates40.05403, -88.87452

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length23.6 ft (7.2 m)
Max Span11.5 ft (3.5 m)
Deck Area37.4 sq m
Main Spans2
Year Built1991

Traffic

Avg Daily Traffic75 (2020)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number058503700000000

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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