Bridge Type
Main Span(s): Steel [3] Truss - Thru [10]
Approach Span(s): Other [00]
Deck: Wood or Timber [8] with Wearing Surface: Wood or Timber [7]
Bridge Dimensions
Length: 50 m = 164.1 ft
Main Spans: 1 at 48.8 m = 160.1 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 4.4 m = 14.4 ft (1 Lanes) and Out-To-Out: 4.7 m = 15.4 ft for a 7.3 m = 24.0 ft approaching roadway.
Vertical Clearance: 4.59 m = 15.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Ravalli County [081], Montana [30]
Owned by County Highway Agency [02], DOT District: 1
5M N DARBY
Condition
Deck: Good [7]
Superstructure: Satisfactory [6]
Substructure: Good [7]
Loading
Design: M 18 / H 20 [4]
Operating: 24.5 metric ton = 27.0 tons (Load and Resistance Factor(LRFR) [3])
Inventory: 18.1 metric ton = 19.9 tons (Load and Resistance Factor(LRFR) [3])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Basically intolerable requiring high priority of replacement [2]
Road Alignment: Better than present minimum criteria [7]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: June 1999 [699] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 0.1 km = 0.1 mi
Traffic
ADT: 135 (2019) and Trucks: 0%
Future ADT: 142 (In 2039
)
