Bridge Type
Main Span(s): Aluminum: Wrought Iron or Cast Iron [9] Truss - Thru [10]
Approach Span(s): Other [00]
Deck: Open Grating [3] with Wearing Surface: Other [9]
Bridge Dimensions
Length: 36.3 m = 119.1 ft
Main Spans: 1 at 35.7 m = 117.1 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 4.2 m = 13.8 ft (1 Lanes) and Out-To-Out: 4.6 m = 15.1 ft for a 5.2 m = 17.1 ft approaching roadway.
Vertical Clearance: 6.1 m = 20.0 ft and Navigational Clearance: 0 = N/A
Location
St. Thomas [67400]: Franklin County [055], Pennsylvania [42]
Owned by Town or Township Highway Agency [03], DOT District: 8
BACK CR; WILLIAMSON
Condition
Deck: Fair [5]
Superstructure: Imminent Failure [1]
Substructure: Imminent Failure [1]
Loading
Design: MS 18 / HS 20 [5]
Operating: 20 metric ton = 22.0 tons (Allowable Stress(AS) [2])
Inventory: 8.2 metric ton = 9.0 tons (Allowable Stress(AS) [2])
Appraisal
Structural:
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Meets minimum tolerable limits to be left in place as is [4]
Waterway: Better than present minimum criteria [7] and Bridge foundations determined to be stable for assessed or calculated scour conditions; field review indicates action is required. [4]
Inspections
Date: August 2020 [0820] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 0.3 km = 0.2 mi
Traffic
ADT: 100 (1987) and Trucks: 0%
Future ADT: 0 (In 2038
)