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NE 21ST AVE over B-8 OVER COLUMBIA SLOUGH

Map

Coordinates:
+45.58177, -122.64369
45°34'54" N, 122°38'37" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.

Facts

Name:NE 21ST AVE over B-8 OVER COLUMBIA SLOUGH
Structure number:25B08 000
Location:21ST-N OF COLUMBIA BLVD
Purpose:Carries highway and pedestrian walkway over waterway
Route classification:Local (Urban) [19]
Length of largest span:42.0 ft. [12.8 m]
Total length:128.9 ft. [39.3 m]
Roadway width between curbs:40.0 ft. [12.2 m]
Deck width edge-to-edge:56.1 ft. [17.1 m]
Skew angle:29°
Owner:City or Municipal Highway Agency [04]
Year built:1974
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:3
Main spans material:Prestressed concrete [5]
Main spans design:Slab [01]
Deck type:Concrete Precast Panels [2]
Wearing surface:Bituminous [6]

Latest Available Inspection: July 2016

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:1,125 [as of 2010]
Truck traffic:10% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Equal to present minimum criteria [6]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge with "unknown" foundation that has not been evaluated for scour. [U]
Operating rating:67.9 tons [61.7 metric tons]
Inventory rating:39.9 tons [36.3 metric tons]
Sufficiency rating:97.0
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$728,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
July 201697.0GoodGoodGoodGood-1125
July 201497.0FairGoodGoodSatisfactory-1125
March 201343.3FairGoodSatisfactoryGoodSD1125
August 201041.0PoorSatisfactorySatisfactorySeriousSD1125
November 200841.0PoorSatisfactorySatisfactorySeriousSD1125
September 200640.7PoorSatisfactoryGoodSeriousSD1082
October 200452.8PoorVery GoodGoodSeriousSD1082
May 200352.8PoorVery GoodGoodSeriousSD1082
September 200296.9FairVery GoodGoodSatisfactory-1082
September 200052.8PoorVery GoodGoodSeriousSD1050
April 199869.9PoorVery GoodGoodPoorSD1050
July 199769.9PoorVery GoodGoodPoorSD1050
December 199569.9PoorVery GoodGoodPoorSD900
July 199569.9PoorVery GoodGoodPoorSD900
August 199369.9PoorVery GoodGoodPoorSD900
September 199165.4GoodVery GoodGoodGoodFO900