Structure 18828 · Linn County, MO

Haven RD over Long Br

Carries Haven RD over Long Br, S 13 T 59 N R 20 W.

Overall conditionPoor

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

How ratings work
Deck8/9 · Very Good
Superstructure6/9 · Satisfactory
Substructuresets the rating4/9 · Poor
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT73 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 6/9Substructure 4/9 · sets the rating

73 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 girder bridge.

Built199828 years old
Length73.2 ft22.3 m
Daily traffic5counted 2024
Last inspectedNovember 2024every 24 months

Location

StateMissouri
CountyLinn
LocationS 13 T 59 N R 20 W
CarriesHaven RD
CrossesLong Br
Coordinates39.92884, -93.08894

Physical Characteristics

MaterialSteel
DesignGirder and Floorbeam
Total Length73.2 ft (22.3 m)
Max Span46.9 ft (14.3 m)
Deck Width18.0 ft (5.5 m)
Deck Area122.7 sq m
Main Spans1
Year Built1998

Traffic

Avg Daily Traffic5 (2024)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number18828

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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