Bridge Type
Main Span(s): Concrete [1] Frame [07]
Approach Span(s): Other [00]
Deck: Not applicable [N] with Wearing Surface: Bituminous [6]
Bridge Dimensions
Length: 24.4 m = 80.1 ft
Main Spans: 1 at 21.9 m = 71.9 ft
Approach Spans: 0
Skew: 7
Width, Roadway: 16.5 m = 54.1 ft (2 Lanes) and Out-To-Out: 18.9 m = 62.0 ft for a 18.3 m = 60.0 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
North Huntingdon [55128]: Westmoreland County [129], Pennsylvania [42]
Owned by State Toll Authority [31], DOT District: 12
IRWIN INTERCHANGE
Condition
Deck: Satisfactory [6]
Superstructure: Fair [5]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 51.7 metric ton = 56.9 tons (Load Factor(LF) [1])
Inventory: 30.8 metric ton = 33.9 tons (Load Factor(LF) [1])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Superior to present desirable criteria [9]
Road Alignment: Equal to present desirable criteria [8]
Waterway: N/A [N] and Bridge not over waterway. [N]
Inspections
Date: July 2020 [0720] and Frequency: 24
Future Work
Work Needed: Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Bridge Detour: 0.8 km = 0.5 mi
Traffic
ADT: 224 (2010) and Trucks: 23%
Future ADT: 286 (In 2030
)
