Structure 4675 · Kalamazoo County, MI

Paterson Street over Kalamazoo River

Carries Paterson Street over Kalamazoo River, City Of Kalamazoo.

Overall conditionGood

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

How ratings work
Deck9/9 · Excellent
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT280 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 9/9Superstructure 8/9Substructure 7/9 · sets the rating

280 ft end to end, longest span 70 ft: about 4 semi-trucks nose to tail. 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 multi-beam bridge.

Built1956rebuilt 2023
Length279.9 ft85.3 m
Daily traffic7,224counted 2021
Last inspectedOctober 2023every 24 months

Location

StateMichigan
CountyKalamazoo
LocationCity Of Kalamazoo
CarriesPaterson Street
CrossesKalamazoo River
Coordinates42.30325, -85.57074

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length279.9 ft (85.3 m)
Max Span69.9 ft (21.3 m)
Deck Width56.4 ft (17.2 m)
Deck Area1467.2 sq m
Main Spans4
Year Built1956 (reconstructed 2023)

Traffic

Avg Daily Traffic7,224 (2021)
Truck Traffic10%
Lanes On Bridge4

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000004675

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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