Structure 197440 · Jasper County, IA

W 108th ST S over Small Stream

Carries W 108th ST S over Small Stream, 079212502.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 3 of 9.

How ratings work
Deck4/9 · Poor
Superstructure5/9 · Fair
Substructuresets the rating3/9 · Serious
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
20 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 5/9Substructure 3/9 · sets the rating

20 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built1947rebuilt 1974
Length20.0 ft6.1 m
Daily traffic41counted 2022
Last inspectedApril 2024every 12 months

Location

StateIowa
CountyJasper
Location079212502
CarriesW 108th ST S
CrossesSmall Stream
Coordinates41.62521, -93.25171

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length20.0 ft (6.1 m)
Max Span19.0 ft (5.8 m)
Deck Width20.0 ft (6.1 m)
Deck Area37.2 sq m
Main Spans1
Year Built1947 (reconstructed 1974)

Traffic

Avg Daily Traffic41 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000197440

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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