HWY 120 over COLUMBIA SLOUGH

Map 

Facts 

Name:	HWY 120 over COLUMBIA SLOUGH
Structure number:	01726 120 00038
Location:	5.5 MI NW PORTLAND CC
Purpose:	Carries highway over waterway
Route classification:	Minor Arterial (Urban) [16]
Length of largest span:	85.0 ft. [25.9 m]
Total length:	337.9 ft. [103.0 m]
Roadway width between curbs:	24.0 ft. [7.3 m]
Deck width edge-to-edge:	33.8 ft. [10.3 m]
Owner:	State Highway Agency [01]
Year built:	1933
Historic significance:	Bridge is not eligible for the National Register of Historic Places [5]
Design load:	M 13.5 / H 15 [2]
Main span material:	Steel [3]
Main span design:	Stringer/Multi-beam or girder [02]
Deck type:	Concrete Cast-in-Place [1]
Wearing surface:	Bituminous [6]

2010 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	9,900 [as of 2008]
Truck traffic:	16% of total traffic
Deck condition:	Satisfactory [6 out of 9]
Superstructure condition:	Satisfactory [6 out of 9]
Substructure condition:	Fair [5 out of 9]
Channel protection:	Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:	Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:	33.9 tons [30.8 metric tons]
Inventory rating:	19.9 tons [18.1 metric tons]
Evaluation:	Functionally obsolete [2]
Sufficiency rating:	39.5
Recommended work:	Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Estimated cost of work:	$1,732,000

2000 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	11,100 [as of 1998]
Truck traffic:	7% of total traffic
Deck condition:	Good [7 out of 9]
Superstructure condition:	Good [7 out of 9]
Substructure condition:	Good [7 out of 9]
Channel protection:	Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:	Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:	33.7 tons [30.6 metric tons]
Inventory rating:	19.8 tons [18.0 metric tons]
Evaluation:	Functionally obsolete [2]
Sufficiency rating:	50.7
Recommended work:	Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Estimated cost of work:	$1,462,000

1992 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	17,000 [as of 1990]
Truck traffic:	10% of total traffic
Deck condition:	Satisfactory [6 out of 9]
Superstructure condition:	Very Good [8 out of 9]
Substructure condition:	Satisfactory [6 out of 9]
Channel protection:	Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:	Scour calculation/evaluation has not been made. [6]
Operating rating:	27.3 tons [24.8 metric tons]
Inventory rating:	18.6 tons [16.9 metric tons]
Evaluation:	Functionally obsolete [2]
Sufficiency rating:	48.9

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