Structure 366030 · Decatur County, IA

250th AVE over Stream

Carries 250th AVE over Stream, 67251002.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT83 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 5/9

83 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.

Built197254 years old
Length83.0 ft25.3 m
Daily traffic5counted 2022
Last inspectedNovember 2022every 24 months

Location

StateIowa
CountyDecatur
Location67251002
Carries250th AVE
CrossesStream
Coordinates40.61811, -93.72866

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length83.0 ft (25.3 m)
Max Span49.9 ft (15.2 m)
Deck Width23.6 ft (7.2 m)
Deck Area182.2 sq m
Main Spans1
Year Built1972

Traffic

Avg Daily Traffic5 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2022
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000366030

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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