SR 99 over DUWAMISH RIVER

Map

Coordinates:
+47.53794, -122.33500
47°32'17" N, 122°20'06" W

Source: National Bridge Inventory. Information not verified; use at your own risk.

Name:	SR 99 over DUWAMISH RIVER
Structure number:	0014459A0000000
Location:	0.1 N JCT SR 509
Purpose:	Carries highway over highway, waterway, and railroad
Route classification:	Principal Arterial - Other Freeways or Expressways (Urban) `[12]`
Length of largest span:	294.0 ft. `[89.6 m]`
Total length:	2895.2 ft. `[882.4 m]`
Roadway width between curbs:	44.0 ft. `[13.4 m]`
Deck width edge-to-edge:	57.7 ft. `[17.6 m]`
Vertical clearance below bridge:	26.2 ft. `[8.0 m]`
Owner:	State Highway Agency `[01]`
Year built:	1996
Historic significance:	Historical significance is not determinable at this time `[4]`
Design load:	MS 22.5 / HS 25 `[9]`
Main span material:	Steel `[3]`
Main span design:	Movable - Bascule `[16]`
Deck type:	Closed Grating `[4]`
Wearing surface:	Latex Concrete or similar additive `[3]`

Good/Fair/Poor Condition:	Fair
Status:	Open, no restriction `[A]`
Average daily traffic:	48,315 `[as of 2016]`
Truck traffic:	8% of total traffic
Deck condition:	Satisfactory `[6 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:	Meets minimum tolerable limits to be left in place as is `[4]`
Underclearances appraisal:	Basically intolerable requiring high priority of corrrective action `[3]`
Water adequacy appraisal:	Equal to present desirable criteria `[8]`
Roadway alignment appraisal:	Equal to present desirable criteria `[8]`
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]`
Pier/abutment protection:	In place and functioning `[2]`
Scour condition:	Bridge foundations determined to be stable for the assessed or calculated scour condition. `[8]`
Sufficiency rating:	58.3
Recommended work:	Bridge rehabilitation because of general structure deterioration or inadequate strength. `[35]`
Estimated cost of work:	$52,110,000

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
September 2018	Fair	Satisfactory	Good	Good	48315	58.3
September 2016	Fair	Satisfactory	Good	Good	42897	56.2
September 2014	Fair	Satisfactory	Good	Good	42897	56.2
September 2012	Fair	Satisfactory	Good	Good	40009	56.2
September 2010	Fair	Satisfactory	Good	Good	39500	59.0
September 2008	Fair	Satisfactory	Good	Good	37698	59.0
August 2006	Fair	Satisfactory	Good	Good	16500	65.8
May 2004	Fair	Satisfactory	Good	Good	16500	65.8
September 2003	Fair	Satisfactory	Good	Good	16500	65.8
July 2002	Fair	Satisfactory	Good	Good	16500	65.8
December 2001	Fair	Satisfactory	Good	Good	16500	65.8
June 2000	Fair	Satisfactory	Good	Good	16500	65.8
September 1999	Good	Good	Good	Good	16500	65.8
May 1998	Good	Good	Good	Good	16500	65.8
April 1997	Good	Good	Good	Good	16500	63.5

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.

Element	Units	Quantity	1-Good	2-Fair	3-Poor	4-Serious
Superstructure
Steel Girder/Beam	linear ft.	256	256	0	0	0
Steel Protective Coating	sq. ft.	4,956	4,695	0	248	13
Prestressed Concrete Girder/Beam	linear ft.	22,210	22,209	0	1	0
Steel Stringer	linear ft.	3,012	3,012	0	0	0
Steel Protective Coating	sq. ft.	58,315	55,240	0	2,928	147
Deck
Reinforced Concrete Deck	sq. ft.	135,500	135,500	0	0	0
Superstructure
Steel Truss	linear ft.	588	587	1	0	0
Steel Protective Coating	sq. ft.	113,843	107,840	0	5,717	286
Steel Floor Beam	linear ft.	1,008	1,008	0	0	0
Steel Protective Coating	sq. ft.	19,516	18,486	0	980	50
Steel Gusset Plate	each	64	64	0	0	0
Substructure
Reinforced Concrete Column	each	57	57	0	0	0
Reinforced Concrete Pier Wall	linear ft.	648	648	0	0	0
Reinforced Concrete Abutment	linear ft.	112	112	0	0	0
Reinforced Concrete Pile	each	5	5	0	0	0
Steel Pier Cap	linear ft.	128	128	0	0	0
Steel Protective Coating	sq. ft.	2,478	2,347	0	124	7
Reinforced Concrete Pier Cap	linear ft.	998	998	0	0	0
Deck
Concrete Filled Grid Deck	sq. ft.	19,398	19,163	210	25	0
Joints
Strip Seal Joint	linear ft.	385	0	385	0	0
Compression Joint	linear ft.	100	0	56	44	0
Open Joint	linear ft.	159	0	106	0	53
Bearings
Elastomeric Bearing	each	84	83	0	1	0
Movable Bearing	each	4	3	0	1	0
Enclosed/Concealed Bearing	each	4	4	0	0	0
Fixed Bearing	each	14	14	0	0	0
Bridge Rail
Steel or Aluminum Bridge Rail	linear ft.	714	714	0	0	0
Reinforced Concrete Bridge Rail	linear ft.	5,030	5,030	0	0	0