Bridge Type
Main Span(s): Concrete continuous [2] Tee beam [04]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Epoxy Overlay [5]
Bridge Dimensions
Length: 73.4 m = 240.8 ft
Main Spans: 4 at 22.8 m = 74.8 ft
Approach Spans: 0
Skew: 20
Width, Roadway: 7.3 m = 24.0 ft (2 Lanes) and Out-To-Out: 9.5 m = 31.2 ft for a 11.8 m = 38.7 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Mackinaw [50300]: Cheboygan County [031], Michigan [26]
Owned by State Highway Agency [01], DOT District: 2
0.6 MI S OF US-31
Condition
Deck: Good [7]
Superstructure: Good [7]
Substructure: Good [7]
Loading
Design: M 13.5 / H 15 [2]
Operating: 60.6 metric ton = 66.7 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 36.3 metric ton = 39.9 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Appraisal
Structural: Better than present minimum criteria [7]
Deck Geometry: Equal to present minimum criteria [6]
Road Alignment: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Waterway: N/A [N] and Bridge not over waterway. [N]
Inspections
Date: April 1999 [499] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 1.8 km = 1.1 mi
Traffic
ADT: 60 (1997) and Trucks: 3%
Future ADT: 100 (In 2007
)