Share:

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 2014 

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:Satisfactory [6 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Equal to present desirable criteria [8]
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. ratingEvaluationDeckSuper.Sub.ADT
July 201497.0Not deficientGoodGoodSatisfactory1125
March 201343.3Structurally deficientGoodSatisfactoryGood1125
August 201041.0Structurally deficientSatisfactorySatisfactorySerious1125
November 200841.0Structurally deficientSatisfactorySatisfactorySerious1125
September 200640.7Structurally deficientSatisfactoryGoodSerious1082
October 200452.8Structurally deficientVery GoodGoodSerious1082
May 200352.8Structurally deficientVery GoodGoodSerious1082
September 200296.9Not deficientVery GoodGoodSatisfactory1082
September 200052.8Structurally deficientVery GoodGoodSerious1050
April 199869.9Structurally deficientVery GoodGoodPoor1050
July 199769.9Structurally deficientVery GoodGoodPoor1050
December 199569.9Structurally deficientVery GoodGoodPoor900
July 199569.9Structurally deficientVery GoodGoodPoor900
August 199369.9Structurally deficientVery GoodGoodPoor900
September 199165.4Functionally obsoleteVery GoodGoodGood900