Bridge Type
Main Span(s): Steel [3] Arch - Thru [12]
Approach Span(s): Steel continuous [4] 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: 2536 m = 8320.6 ft
Main Spans: 1 at 152.4 m = 500.0 ft
Approach Spans: 46
Skew: 0
Width, Roadway: 21.3 m = 69.9 ft (4 Lanes) and Out-To-Out: 25.2 m = 82.7 ft for a 22.3 m = 73.2 ft approaching roadway.
Vertical Clearance: 6.34 m = 20.8 ft and Navigational Clearance: 36.6 m = 120.1 ft
Location
Duluth [17000]: St. Louis County [137], Minnesota [27]
Owned by State Highway Agency [01], DOT District: 1
AT WISCONSIN STATE LINE
Condition
Deck: Good [7]
Superstructure: Good [7]
Substructure: Good [7]
Loading
Design: MS 18 / HS 20 [5]
Operating: 66.3 metric ton = 72.9 tons (Load Factor(LF) [1])
Inventory: 39.8 metric ton = 43.8 tons (Load Factor(LF) [1])
Appraisal
Structural: Better than present minimum criteria [7]
Deck Geometry: Better than present minimum criteria [7]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: August 2020 [0820] and Frequency: 12
Future Work
Work Needed:
Bridge Detour: 1 km = 0.6 mi
Traffic
ADT: 18500 (2019) and Trucks: 5%
Future ADT: 18000 (In 2039
)
