Bridge Type
Main Span(s): Steel continuous [4] Stringer/Multi-beam or girder [02]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Latex Concrete or similar additive [3]
Bridge Dimensions
Length: 138.7 m = 455.1 ft
Main Spans: 3 at 41.5 m = 136.2 ft
Approach Spans: 2
Skew: 30
Width, Roadway: 8.5 m = 27.9 ft (2 Lanes) and Out-To-Out: 9.7 m = 31.8 ft for a 12.2 m = 40.0 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Missoula County [063], Montana [30]
Owned by State Highway Agency [01], DOT District: 1
1.9M W BONNER
Condition
Deck: Good [7]
Superstructure: Fair [5]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 41.7 metric ton = 45.9 tons (Load and Resistance Factor(LRFR) [3])
Inventory: 32.7 metric ton = 36.0 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 corrrective action [3]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Superior to present desirable criteria [9] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: April 2020 [0420] and Frequency: 24
Future Work
Work Needed: Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Bridge Detour: 0.1 km = 0.1 mi
Traffic
ADT: 8825 (2019) and Trucks: 10%
Future ADT: 18533 (In 2039
)
