Structure 81560 · Buchanan County, IA

Local 305th St. over Lime CR

Carries Local 305th St. over Lime CR, 087101303.

Overall conditionPoor

Set by its lowest-rated component: Deck at 2 of 9.

How ratings work
Decksets the rating2/9 · Critical
Superstructure3/9 · Serious
Substructure4/9 · Poor
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT81 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 2/9 · sets the ratingSuperstructure 3/9Substructure 4/9

81 ft end to end. Lengths and the car 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 truss.

Built1910116 years old
Length81.0 ft24.7 m
Daily traffic16counted 2022
Last inspectedDecember 2015every 12 months

Location

StateIowa
CountyBuchanan
Location087101303
CarriesLocal 305th St.
CrossesLime CR
Coordinates42.35075, -91.96666

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length81.0 ft (24.7 m)
Max Span80.1 ft (24.4 m)
Deck Width15.7 ft (4.8 m)
Deck Area118.6 sq m
Main Spans1
Year Built1910

Traffic

Avg Daily Traffic16 (2022)
Lanes On Bridge1

Inspection & Ownership

Last InspectionDecember 2015
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical5 — Stable for scour
Structure Number000000000081560

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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