Structure 8005200000000 · Carroll County, IL

Il 64/ US 52 over Miss Riv & Bnrr

Carries Il 64/ US 52 over Miss Riv & Bnrr, NW Edge Of Savanna.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT2,463 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

2,463 ft end to end: about 6.8 football fields. 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 through arch.

Built20188 years old
Length2462.9 ft750.7 m
Daily traffic2,300counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateIllinois
CountyCarroll
LocationNW Edge Of Savanna
CarriesIl 64/ US 52
CrossesMiss Riv & Bnrr
Coordinates42.10407, -90.16091

Physical Characteristics

MaterialSteel
DesignArch - Thru
Total Length2462.9 ft (750.7 m)
Max Span545.9 ft (166.4 m)
Deck Width43.3 ft (13.2 m)
Deck Area9909.2 sq m
Main Spans1
Year Built2018

Traffic

Avg Daily Traffic2,300 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number008005200000000

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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