Bridge Type
Main Span(s): Steel [3] Movable - Bascule [16]
Approach Span(s): Concrete continuous [2] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Monolithic Concrete (concurrently placed with structural deck) [1]
Bridge Dimensions
Length: 280.7 m = 921.0 ft
Main Spans: 1 at 60.4 m = 198.2 ft
Approach Spans: 4
Skew: 27
Width, Roadway: 16.8 m = 55.1 ft (4 Lanes) and Out-To-Out: 21.5 m = 70.5 ft for a 16.5 m = 54.1 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 43.6 m = 143.1 ft
Location
King [99033]: King County [033], Washington [53]
Owned by County Highway Agency [02], DOT District: 1
0.8 MI N OF SR-99
Condition
Deck: Very Good [8]
Superstructure: Very Good [8]
Substructure: Very Good [8]
Loading
Design: HL93 [A]
Operating: 47.6 metric ton = 52.4 tons (Load and Resistance Factor Rating (LRFR) rating reported by rating factor (RF) method using HL-93 loadings [8])
Inventory: 27.5 metric ton = 30.3 tons (Load and Resistance Factor Rating (LRFR) rating reported by rating factor (RF) method using HL-93 loadings [8])
Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: September 2020 [0920] and Frequency: 24
Future Work
Work Needed: Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Bridge Detour: 0.6 km = 0.4 mi
Traffic
ADT: 16000 (2018) and Trucks: 13%
Future ADT: 31000 (In 2038
)
