Structure 2758B932600000 · Multnomah County, OR

West Morrison Conn over City Streets & Park

Carries West Morrison Conn over City Streets & Park, West End Morrison Br.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,218 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

1,218 ft end to end, longest span 111 ft: about 3.4 football fields. 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.

Built195868 years old
Length1217.8 ft371.2 m
Daily traffic57,504counted 2020
Last inspectedMarch 2023every 24 months

Location

StateOregon
CountyMultnomah
LocationWest End Morrison Br
CarriesWest Morrison Conn
CrossesCity Streets & Park
Coordinates45.51841, -122.67196

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length1217.8 ft (371.2 m)
Max Span110.9 ft (33.8 m)
Deck Width82.0 ft (25 m)
Deck Area9,280 sq m
Main Spans23
Year Built1958

Traffic

Avg Daily Traffic57,504 (2020)
Truck Traffic10%
Lanes On Bridge6
Lanes Under Bridge5

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number02758B932600000

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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