Bridge Type
Main Span(s): Steel [3] Movable - Lift [15]
Approach Span(s): Steel continuous [4] Girder and floorbeam system [03]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Latex Concrete or similar additive [3]
Bridge Dimensions
Length: 399.3 m = 1310.1 ft
Main Spans: 1 at 82 m = 269.0 ft
Approach Spans: 10
Skew: 0
Width, Roadway: 16.4 m = 53.8 ft (4 Lanes) and Out-To-Out: 21 m = 68.9 ft for a 16.4 m = 53.8 ft approaching roadway.
Vertical Clearance: 4.32 m = 14.2 ft and Navigational Clearance: 0.3 m = 1.0 ft
Location
Houghton [39360]: Houghton County [061], Michigan [26]
Owned by State Highway Agency [01], DOT District: 1
HOUGHTON HANCOCK
Condition
Deck: Satisfactory [6]
Superstructure: Fair [5]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 50.5 metric ton = 55.6 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 30.1 metric ton = 33.1 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Better than present minimum criteria [7]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: June 2020 [0620] and Frequency: 15
Future Work
Work Needed:
Bridge Detour: 32 km = 19.8 mi
Traffic
ADT: 25000 (2015) and Trucks: 3%
Future ADT: 27600 (In 2035
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