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: Monolithic Concrete (concurrently placed with structural deck) [1]
Bridge Dimensions
Length: 73.1 m = 239.8 ft
Main Spans: 4 at 21.6 m = 70.9 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 7.9 m = 25.9 ft (2 Lanes) and Out-To-Out: 10.1 m = 33.1 ft for a 10.3 m = 33.8 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Boston [09680]: Ionia County [067], Michigan [26]
Owned by State Highway Agency [01], DOT District: 3
5 MI E OF KENT CO LINE
Condition
Deck: Fair [5]
Superstructure: Satisfactory [6]
Substructure: Fair [5]
Loading
Design: M 13.5 / H 15 [2]
Operating: 55.1 metric ton = 60.6 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 33 metric ton = 36.3 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: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Better than present minimum criteria [7]
Waterway: N/A [N] and Bridge not over waterway. [N]
Inspections
Date: December 2020 [1220] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 0.6 km = 0.4 mi
Traffic
ADT: 300 (1974) and Trucks: 0%
Future ADT: 300 (In 1977
)
